The key thing is to use Teflon or high temp insulation wire to avoid heat damage to the wiring. Reaction score. 3 LX running rich, hesitation on acceleration, high and hanging idle Help!Svt 6lMustang o2 eliminator Mustang o2 sensors sensor oxygen gt 2005 6l engine emissions motorcraft lmr eliminators milO2 svt bypass. Based on what is found in the exhaust gases (as measured by the oxygen sensors), the ECU is then able to adjust the necessary fuel. #howto #cars #ford #diy #easy #shorts How To Remove And Install Mustang Front Oxygen Sensor Bank 2 Sensor 1o2 sensor,oxygen sensor,o2 sensor removal,bad oxyg. 99 2934 posts · Joined 2011. Fox 5. 2004 Mustang Parts; 2003 Mustang Parts; 2002 Mustang Parts; 2001 Mustang Parts; 2000 Mustang Parts. I borrowed a specialty tool from Auto Zone to remove the old one. 39 Inch (12mm) 6-Point fits All Vehicle O2 Removal and Installation, 65 Mn Steel Universal Puller Oxygen Sensor Socket (Large) 4. Would have been better to replace just the front O2 sensors as the rears only monitor the cats. Get deals on automotive parts, truck parts and more. alwayshi. Add to quote; Share Only show this user. 4L car (pick up, SUV) is not that hard to do. I bought a kit made for the 2015-2017 5. I learned this trick many years ago and it REALLY helps out when it comes to seized bolts / nuts. 2. A malfunctioning sensor can cause lean and rich conditions while illuminating your check engine light. OE connectors and wire lengths. MACH 1 MUSTANG, SHELBY GT 500, COBRA R, BULLITT MUSTANG, SN95, S197, V6 MUSTANG, FOX BODY MUSTANG,MACH-E, AND 5. 93 Reviews. Buy a can of MAF cleaner and clean the MAF. WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market. Connector Gender: Female. 8v seems rich to me but being steady means that the cats are working properly. 2004 Mustang Parts; 2003 Mustang Parts; 2002 Mustang Parts; 2001. 0. A MONTH later the code comes back (The code again popped up within a few miles of driving) so I decide to change the 02 sensors, replace the air filter, clean the. P2197 O2 Sensor Signal. This range does not include taxes and fees, and does not factor in your unique location. P2196 trouble code definition O2 Sensor Signal Stuck Rich (Bank 1 Sensor 1) What the P2196 code means This code indicates there is too much fuel in the exhaust measured by bank. Oct 27, 2009 #3 Oct 27, 2009 #3 Awesome. 2006 GT- Airaid Race CAI,. Expert. Engine Tuning Information Get the most out of your engine with a performance PCM tune. Hand-picked by experts! Pay later or over time with Affirm. 1996 - 2004 Mustang GT. O2 sensor wiring. #3 · Jan 14, 2011. Those are hte only pair of 02s that can be turned off by a tune/mil eliminators. RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. You post did not mention if you are looking for the wire colors from the sensor or the CAR harness. 8 volt signal which the ECM/PCM interprets. '88 GT convertible, 5 speed, 3:08 gears, A9L Mass Air conversion. I have to put in more fuel and get it above 3/4 tank and try it again hopefully the next round of driving will make the 02's ready. 6L) Top. Here's the wiring diagram for the O2 sensors. 99. The O2 sensor or sensors are called the after cat sensors. kow. Using the front jack point of the vehicle, jack up the car. Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST. Vehicle (s) 2016 Mustang GT Premium. Using all one gauge wire makes the. Buy Oxygen (O2) Sensor - NGK 21555 online from NAPA Auto Parts Stores. #2 · Feb 11, 2010. 6. Aug 12, 2009 52 0 0. the power ground for the starter & alternator. I have done a scan on it and everything looks OK. 0L) 1996 - 2004 Mustang GT (SN95 -. ECM Monitors. # 485464152. A properly functioning oxygen sensor's (front sensor) voltage should be switching between 0. 3,902. A popular mod is to decat the exhaust or install an. the catalyst monitor will not run since it requires signals from the oxygen sensor. Part #: 17025 Line: BOS. Reduced Fuel Efficiency. Add to Cart. 02 sensors measure the amount of oxygen in the exhaust and report the level to your vehicle’s computer. Reduced Fuel Efficiency. 25@110 naturally aspirated on a bone stock 2V longblock. One type of sensor that provides critical data to the PCM is the oxygen sensor. 0L gave the Mustang a 112-horsepower upgrade over the 300 horsepower 4. ill probably just order two new front ones and see if that fixes it. Sure would be a shame to replace. Regarding the PCM re-learn question. grn 00 gt. 6L Mustang Tech. If your car is a manual and you’re having a hard time readying the monitors, high gear low rpm. I know my o2 sensors are old and crappy, but i dont know how bad they actually are. 95 mustang gt: any one know how many o2 sensors does it have 2. Your 2195 code for the sensor reading rich can be to blame on one of these issues. 45 . It then relays this information to the ECU to adjust the fuel mixture accordingly. Oxygen Sensor, OE Style, Heated, Thread-In Mounting, Ford, Lincoln, Mazda, Mercury, Each. Put jack stands under the frame towards the front of the vehicle. Jun 9, 2014. #1 · Jan 7, 2010. The key thing is to use Teflon or high temp insulation wire to avoid heat damage to the wiring. 20 posts · Joined 2015. 1998 Mustang gt o2 sensor codes question. Disconnect the negative ( - ) battery terminal. ) The secondary power ground is between the back of the. 1->0. These oxygen sensor extensions fix both problems in a snap and feature Ford connectors so they simply plug into the existing connectors. Then when going to reinstall them I realized I didn't mark the left and right sides. Rough Idle. Aug 14, 2009. Which means they were toggling around the same point, the stoichiometric point of 14. #1 · Jan 7, 2010. Description. So Bank 1 Sensor 1 is the O2 sensor closest to the passenger side head (right around where the passenger side exhaust manifold. This video walks you through the removal and installation of an oxygen sensor on a 1994 thru 2004 Ford Mustang. Motorcraft ® oxygen sensors are designed for maximum performance. it did however cause the car to misfire all over that bank of of cylinders. 0L) My car has been idling rough and even dying at when i come to a stop sometimes. read more. 1992 mustang gt twinturbo'd 1988 mustang gt bottlefed 2004 mach 1 collecting dust 1989. 99 up to $255. 1996 - 2004 SN95 Mustang -General/Talk-Sep 8, 2023. So a few resistors in the harness would make them turn the engine light back off. It is not a user option on the SCT tuner but your tune programmer can turn off the rear O2 sensors. 1 - 5 of 5 Posts. Bapmic Oxygen 02 O2 Sensor Downstream 234-4337 13444 12578459 Compatible with 1996-2004 Chevrolet GMC Cadillac ASG277. This is due to the even oxygen content that both sensors. I have searched extensively on the forum and have not found what I find it be a definitive answer to which F150 sensors to use for 2018+ cars. $239. I'm having trouble with my check engine light coming on. Gently press on the tab of the sensor, then pull it out of the housing it is in. Get a free detailed. On Amazon:*PNEUMATIC PICKLE FORK SET: posts · Joined 2009. 2,736 satisfied customers. 87GT Drop Top Member. (S197 - 5th Gen - 5. Complete the long tube header installation on your 1987-2010 Mustang with this O2 extension harness kit! The SVE oxygen sensor extension harness sets feature a direct plug-in design to prevent the cutting and lengthening of your oxygen sensor wires thanks to the factory connections. Ford Mustang 2004, Premium Narrow-band Oxygen Sensor by Bosch®. I got my 2004 GT about a month ago and it has roughly 190,000 miles on it. The purpose of oxygen sensors is to sniff the amount of oxygen in the exhaust gas as it flows out of the headers and report back to your Mustang’s engine control unit (ECU) as to what the fuel mixture is. (S197 - 5th Gen - 5. 6 GT some problems with the transmission and solenoid codes, they made me to remplace a lot of unnecessary things and expensive ones, however at the end i ran out of money, i bought a new PCM, and bum i fixed my. #1. I'm getting ready to install a wide band and. You could also try the ACT sensor. An imbalance is indicated when multiple samples of the accumulated. Code P0155 is part of a family of codes, listed as follows: P0141 – Sensor Heater Circuit Bank 1 Sensor 2; P0161 – Sensor Heater Circuit Bank 2 Sensor 2; P0135 – O2 Sensor Heater Circuit Bank 1 Sensor 1; P0155 – O2 Heater Circuit Bank 2, Sensor 1; For more information on the. 369 posts · Joined 2013. The air/fuel mixture of the vehicle becomes irregular, resulting in poor fuel economy. 35. BBK utilizes factory-style, 5-pin connectors to ensure a perfect fit. What the P2197 code means. Hooker Blackheart. The rear O2 sensors are located after the catalytic converters on the mid-pipe. 2/pkg. Do you need to Replace the oxygen sensor on your Ford Mustang (1994 - 2004) but don't know where to start? This video. 2017 Mustang GT Premium - Grabber Blue, Manual, Performance Pack, 401A, Premier Trim - Sold 2021 Mustang Mach 1 Premium Chassis #5059 - Fighter Jet Gray, TREMEC, 700A, Elite Package, Appearance Package, Handling Package, Navigation, Kook's Green Catted Headers, GT500 Borla ATAK Catback, Wengerd Performance. Misfiring or stalling. On top of low prices, Advance Auto Parts offers 4 different trusted brands of Oxygen Sensor products for the 2006 Ford Mustang. April 19, 2021 by Jason. After the sensor is removed, be sure to use a thread cleaner to clean up the bung threads. However, then they will be off when/if you need an emissions test and will fail that test unless you get an emissions tune for testing. 1 - 24 of 5851 results for Oxygen Sensor Compare Refine. 95. 8L v6Be the first to answer. 👉 👈 Full video!! 📽 The downstream oxygen sensors on a 2005 - '10 4. 5777 posts · Joined 2005. i have a 95 mustang gt with 5. 6L Mustang w/ Long Tube Headers) $599. 1. 8 are very important fuses for engine management. Actually the passenger side is bank 1 on these motors as the #1 cylinder is the front-most cylinder on the passenger side. / 3,835 lbs. $34. A worn-out oxygen sensor can cause engine performance problems and shorten the life of. 8 powers the O2 heaters. 500 Volts, it knows it has injected too much fuel and. Your 1994-04 Mustang's O2 sensors read the amount of oxygen in your exhaust to adjust air/fuel ratios. 0L) 1996 - 2004 Mustang GT (SN95 - 4th Gen - 4. -----2019 PP1/401A/A10 - 10. They're literally designed for what you want to do. That is what the 1. Buy Mil Eliminators here: 4: Disconnect the O2 Sensor. Good prices too! -Dale. I have done a scan on it and everything look ok,but the cam sensor reads good and when you unplug the connector it still reads good does t I have a 2004 Mustang with a 3. Description. This is especially useful if you are trying to manually override the air and fuel. 02 GT throwing several codes, #8 fuse. 50+ bought in past month. Jan 6, 2004 2,085 5 49. 060. 1 mm = approximately . and i would also run the car for 3 min to warm up the threads and then spray the o2 sensors its self with PB blaster or something similar to. 0 Mustang Tech . Ran the codes again to be sure. However, REGARDLESS of how CLEAN an O2 sensor is, as it ages (~20K+ miles), it will *slow down* in response time and Also start to make the car run *a LITTLE* (~0. Ford oxygen sensor simulator will allow you to drive without cat and still keep the SES light off. 3" pushrods, BBK shorties, Crane PS-91 coil, Walbro 155lph fuel pump, FRPP 24# injectors, Kirban AFPR, FRPP 65mm TB, Edelbrock Performer intake,. The oxygen sensors do not have a ground wire. Without cats installed it will see an even switch rate between the front and rear sensors and assume that it has a bad cat. $69. In addition to monitoring smog equipment, manufacturers began to use the on-board diagnostic system to monitor various aspects of the engine,. This sensor features a factory style connector for an easy plug and play installation and will replace LH or RH upstream & downstream sensors. I believe who you order the tuner from can set what parameters you are allowed to change. Top Contributors this Month View All KEVINS 27 Replies. Easy to use parts catalog. Thread. Check Details. #3 · Jan 14, 2011. 16" Long, Heated, Exact Fit from $61. Hand-picked by experts! Pay later or over time with Affirm. Bladerunner said: Only use Ford Motorcraft 02 sensors on your mustang. If one of your sensors goes bad, you could experience numerous issues as a result. The code is triggered when there is an issue with the response time from the oxygen (O2) sensor when switching voltage levels. All you have to do is push down the little tab and pull them apart. Sicarius428 Active Member. computer controlled engines. FREE 2 or 3-Day Delivery on Orders $119+ Details. Check out the pics in this thread: How to - o2 Non-fouler/Cheater - NewCelica. Features factory connections for a quick and easy installation. #2. Very gently with my gun turned way down and back and forth I finally got the last nut off. 1999-2004. codes. I have an issue with all the sensors on the same circuit: all four O2 sensor heaters, EGR and PCV, see picture for codes. the power ground for the starter & alternator. s34nUSA said: The answer to your question is a resounding " it depends ". However I was also told that my 94 auto v6 has 4 o2 sensor locations. It's much more common to find a corroded connector terminal or a wiring harness that fell down onto hot exhaust parts and a wire melted through and is grounded. Estimated Ship Date: Estimated Ship Date: BBK O2 Sensor Extension Harness Sets 16332. I have emissions due in a week and 2 years ago i threw a really messed up tune on their from a manual just cause it had a cel/rear02 sensor. Gently lower the vehicle back down on the stands. 1991 Ford Mustang GT. But with the o2 sensor is it as simple as swapping it out for a new one to fix the richness level or is this something that my mods or tune is causing? The other o2 sensor is functioning fine and my rear sensors are turned off (just to answer any loose questions) 2004 Mustang GT 40th Anniversary Bassani o/r x-pipe, Flowmaster 40. 2004 Mustang Parts; 2003 Mustang Parts; 2002 Mustang Parts; 2001 Mustang Parts; 2000 Mustang Parts. you cannot put MIL eliminators on the front o2 sensors. 7 posts · Joined 2020. FREE 2 or 3-Day Delivery on Orders $119+ Details. Reaction score. Your Mustang's O2 sensors read the amount of oxygen in your exhaust to adjust air/fuel ratios. 99. The oxygen sensor and oxygen sensor heat. 05 mustang 02 sensor Bank 1 sensor 1Once you've got your exhaust assembled just the way you want it on your Mustang, there are some Exhaust Accessories you'll want to add. The rear sensors only purpose is to monitor the funtion of the cats. 700 with a stft reading of 8. On V engines, there will be two, three or four sensors: 1-1, 2-1, 1-2 and on some with dual exhaust, 2-2. These are the correct Ford part numbers for a 94-95 Mustang GT with manual transmission. Mechanical light came up and had the code ran at a ford dealer. This Ford Mustang GT O2 Sensor Simulator does not work on 5 or 6-wire wideband systems. 0 TiVCT Coyote Engine Harness (11-14) #M12508M50. The common causes of the P2254 code include malfunctioning O2 sensors, faulty wiring or connectors, and a faulty PCM. It is more evident when the automobile is at idle and/or running at a very low speed. The oxygen sensor in your vehicle controls the air to fuel ratio. Here are the codes in order. Pick one up today to get rid of your check engine light, and get your Coyote engine running smoothly again. Fitment Includes: 2005, 2006, 2007, 2008, 2009 Mustangs. I got my 2004 GT about a month ago and it has roughly 190,000 miles on it. If it's too tight a fit and you can't get a wrench on them, the special O2 sensors socket might be a better choice here. After reading a bunch of forms I was pretty convinced the rough. 920v), the lower the more fuel (0. 0L Passenger Side Oxygen Sensor. Symptoms of a bad O2 sensor: Sudden decrease in fuel mileage. The purpose of oxygen sensors is to sniff the amount of oxygen in the exhaust gas as it flows out of the headers and report back to your Mustang’s engine control unit (ECU) as to what the fuel mixture is. Remove the relay and retest the circuit. 45 volts is interpreted by the ECM as a rich exhaust, and an O2 sensor voltage signal below 0. B1 S2 and PO156 O2 sens. MACH 1 MUSTANG, SHELBY GT 500, COBRA R, BULLITT MUSTANG, SN95, S197,. Not Yet Reviewed. Some Connectors May. - Ground for O2 heater. If not, check the wring to the rear O2 sensors. "Faking out" an oxygen sensor refers to the process of bypassing the sensor so that the sensor does not relay the correct information to the system's computer. 040 (which is pronounced, 40 thousandths) So 1. 9 it will crank but not start. These 18" BBK O2 extensions fix the issue by plugging into your existing wiring plug and your O2 sensor wiring to complete the connection. Pulled the codes and I am getting two codes I never got before 172 - o2 Sensor circuit indicates system lean (right side) 176 - o2 Sensor circuit indicates system lean (left side) Now, list of mods: Edelbrock Performer intake & 190 heads, E303 cam, FRPP shorties, O/R H pipe, stock MAF, BBK 65mm TB, BBK CAI, and a SCT chip with bama. Excessive fuel pressure. 2014 Mustang GT 6R80 Black, Built Motor and Trans, 805whp, 606wtq, Procharger D1SC Stage 2. Part Number: DNP-234-4610. 6859 posts · Joined 2010. Most of. Oct 30, 2018. Status Not open for further replies. Ships from and sold by Trends Auto. May 25, 2011. It has aftermarket exhaust on it causing it to trip the O2 sensor. #1 · Mar 25, 2015 (Edited) here is my problem, i recently had a problem with my mustang 06 4. The on-board diagnostic (OBD) system was developed for manufacturers to monitor emission control devices on their vehicles. Finally got my Speed of Sound gauge pod installed, water temp gauge and Raptor shift light hooked up. #2. Part #: 350-31002 Line: WLK. Sep 11, 2023. Cory. 74 (1. 6L Mustang Forums (1996-2004) 4. *Free Shipping on Orders Over $119* FREE 2 or 3-Day Delivery on Orders $119+ Details. computer controlled engines. 27. 25 would be about . Replacing 4 O4 sensors with no improvement is a big "parts changer" hit to the wallet. O2 oxygen 8lOxygen mustang ford ebay Hatchback fits svt o2 oxygen convertible sensor mustang gt pair ford4pcs o2 oxygen sensors ford mustang 1999-2003 direct fit 3. H&R Race Springs, Bilsteins, J&M CC plates, J&M LCAs, BMR goodies. 6859 posts · Joined 2010. Description. They are the perfect choice if you own any of the following vehicles, Mitsubishi Raider V8 4. O2 Sensors; X-Pipes Resonator Delete; Catback Exhaust. 120 to 0. O2 oxygen 8lOxygen mustang ford ebay Hatchback fits svt o2 oxygen convertible sensor mustang gt pair ford4pcs o2 oxygen sensors ford mustang 1999-2003 direct fit 3. Update! The sensor location I described yesterday was incorrect, on my 90 GT that is the temp sensor for the guage pod. 4WD Actuator Switch for 2004 Chevrolet Silverado 1500. So far after about 200 miles, the cel has not come on. Cleaning will just allow more O2 to get to the sensor. P2196 is a generic OBD-II. Running the test now would cause inaccurate results, so the test is will not run pending. Bank 2 is the group of cylinders that do not contain the number one cylinder; bank 1 is. ) Use a hammer to tap the chisel until the honeycomb breaks apart and your catalytic converter hollows out completely. 2003 Mustang GT, O2 sensor question, little help please. This article applies to the V6 Ford Mustang (1994-2004). . This guide will help provide you with the location and information to allow you to change a faulty oxygen sensor. 1 Year Limited Warranty. Thread. 29 (17) O2 Oxygen Sensor Set; Upstream and Downstream. 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 3. 305/45/17 Street SS's - Pump E70 - 9. 6L. 5. If the powertrain control module (PCM) detects a level of voltage from an oxygen (O2) sensor that does not correspond to acceptable parameters, the P2254 code is stored. But you have two on each side. Hooked my scan tool up to my 2001 gt today to live data to check the o2 sensors. . '14 GT 93 tune, 4. If you really need to, you can unlock the pins in the connector and use your old one. P1151 - Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean. went to autozone and got these codes pulled from my comp. Fuse F2. BBK Catted X-Pipe (96-04 4. 4. Oxygen Sensor. In order to create enough space to remove the crankshaft position sensor, the serpentine belt and A/C compressor must be removed. Replacing 4 O4 sensors with no improvement is a big "parts changer" hit to the wallet. 2000 Mustang GT Steeda #0048 34k miles. Most cars are automatic so at 40 mph it’s in sixth gear and 1500 rpm. Long, Factory Connectors, Front Sensors Only, For Use With Long Tube Headers, Ford, Mustang, 3. Jump to Latest Follow 3K views. Description: Motorcraft Parts are the only parts designed and built to the specific standards of Ford Motor Company and are the only parts. The rear are there just for emissions. Also, these were the results from the code reader: Results from 1st scan: KOEO 111 = "System PASS" Continous Memory 176 = "HEGO (HO2S) sensor fault/always lean" KOER 314 = "(Cars ONLY): Thermactor air system/fault during engine run self-test / left side" 311 = "Thermactor air system/fault during engine run self-test" Results from 2nd. Thread starter ddrallstar69; Start date Jan 21, 2012; D. Once you have found the O2 sensors, you will need to follow the green wire that is right on top of each of them. This Ford Rear Oxygen Sensor is an OEM direct replacement part for your faulty rear driver side Oxygen Sensor (Motorcraft Part Number: DY-1401) for your. There are 2 on each Bank or side of the Exhaust system. 99 (10) OPR O2 Sensor Wire Harness (96-98 4. grn 00 gt. Using all one gauge wire makes. Apr 26, 2009 43 0 6 Killeen, Texas. Common causes include a failed oxygen sensor, wiring issues, a rich running condition, and PCM issues. The wiring harness that all four of the O2. Car runs great and tuned great. (automatic :weeps) Engine: MAC CAI, BBK shorty headers, off-road X-pipes, and Borla Stinger Cat. Try disconnecting the battery cable for 10 minutes or so that will wipe everything. my computer out and searched through all the wires. Finally got my Speed of Sound gauge pod installed, water temp gauge and Raptor shift light hooked up. 4. Moving inside the car, locate the male plug on the other end of the wiring. Motorcraft parts fit right the first time for quicker, easier installation. 1594 posts · Joined 2007. MODS: Vortech V1 T-Trim @ 7. . According to my research, your o2 sensor wires are as follow's: #29 on your ecu is the wire that gets the info from the 02 sensor. Fuse F2. Oxygen sensors are a vital component of your emissions system. Based on this input, the computer calibrates the amount of fuel going into the engine to maintain the optimal ratio between air and fuel. As far as which one's are bad, if your CEL is on, take it to Autozone and have them run the code scanner on it. Leaking or contaminated fuel injectors. 99; Sensor Type: Narrow-Band; Wiring Harness Length: . Now I just need to get my A/F gauge hooked up. Now you need to grab your two new oxygen. GP-SE. 2003-2004 Mach 1 Mustang Parts; 2003-2004 SVT Cobra Mustang Parts;Mustang 5. So i have a 2011 mustang gt with 66,000 miles on it. 80FoxCoupe Well-Known Member. G. stangPlus2Birds · #5 · Apr 22, 2005. Replace a Faulty Oxygen Sensor. '96stangGTpower Discussion starter · #3 · May 21, 2010. 2003 Mustang GT Intake & Exhaust: K&N FIPK CAI, Mac O/R H-Pipe, Custom Catback w/ Magnaflow Magnapack Mufflers. This O2 Oxygen Sensor fits all 2018-2023 Ford Mustang GT Models with Automatic Transmission. . Check your vehicle manual to accurately describe where the O2 sensor fuse lies. Hand-picked by experts! Pay later or over time with Affirm. The 02 sensor will stay the same. 2. bank 1 = drivers side. 99. O2 Sensor Harness (96-98) 4. 0. They detect the amount of oxygen in the exhaust system and rely on built-in heating elements to reach operating temperatures. In this video, you will learn how to test an oxygen sensor (upstream). Powerheads built 2v, Saleen Series IV Lysholm 1. I got a code a few days ago, pulled it and it was P0133 (upstream heated O2 sensore slow response- bank 1) I already got the o2 sensor, just waiting on the. For example IF an "application" uses a wide band O2 sensor in the front O2 sensor and a narrow band O2 in after cats THEN swapping the O2 sensors would most certainly cause a problem. 4. 122. The diagnostic monitors the pre-catalyst heated oxygen sensor (HO2S) signal frequency and amplitude characteristics by calculating an accumulated voltage over a predetermined sample period. If it finds an issue in the heater circuit for the engine bank 1’s downstream oxygen sensor, it sets code P0141. 0 volt at a rate of approximately 50 cycles per minute. The lady who tested the car at emissions asked if the car was stored alot and that could.