Question about 1990 Isuzu Trooper

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Check engine light on; used obd to read code. It said O2 sensors were bad, I replaced both O2 sensors. 6 miles later the check engine light came back on. I read codes again and this time it said "Running Lean" P0171, Bank 1. What do I do now?

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  • Anonymous Mar 22, 2014

    2002 Kia Sportage computer will not hold a reset after replacing the downstream O2 sensor. After installation of confirmed good sensor & reset of the on board computer, the check engine light will come back on after driving ave 8 miles? Again the sensor checked & confirmed good plus the obc was read by 2 different code readers which both showed the same results. Thought I saw something about faulty wires in a general google search regarding this prob??

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Run fuel system cleaner through it, you have dirty injectors is all!!

Posted on Aug 20, 2008

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2 Answers

My 03 Ecl Spy GT didn't pass CA smog test? OBD II and OBD Bulb check. Ser Fault Codes: P0136- P0141-P0431-P0455.


I'm sorry you replaced the parts without testing first. Codes only give mechanics a suggested area to test, not which components to replace.
Since you replaced the O2 sensor for the first two codes, a mechanic will need to check to see if it is working by reading the data flow from the sensor with a scanner while the engine is warming up. The catalytic converter will also need to be tested to troubleshoot code 431.
Code 455 is for a leak in the evap system which is what vents the gas tank to the vapor canister. The system will need to be pressure checked for leaks and then repaired.
Keep in mind, once the repairs are made and the codes erased, the car will need to be driven at least 100 miles in various conditions before you re-test.

Sep 04, 2015 | 2003 Mitsubishi Eclipse Spyder GT

1 Answer

Check engine light code p2196,p2197, po300 ,304,305,306,p2 ,Im freeking out.


P0300 Random/Multiple Cylinder Misfire Detected P0301 Cylinder 1 Misfire Detected P0302 Cylinder 2 Misfire Detected P0303 Cylinder 3 Misfire Detected P0304 Cylinder 4 Misfire Detected P0305 Cylinder 5 Misfire Detected P0306 Cylinder 6 Misfire Detected P0307 Cylinder 7 Misfire Detected P0308 Cylinder 8 Misfire Detected P0309 Cylinder 9 Misfire Detected P0310 Cylinder 10 Misfire Detected P0311 Cylinder 11 Misfire Detected P0312 Cylinder 12 Misfire Detected P0313 Misfire Detected with Low Fuel P0314 Single Cylinder Misfire (Cylinder not Specified) P0315 Crankshaft Position System Variation Not Learned P0316 Misfire Detected On Startup (First 1000 Revolutions)

Read more at: http://www.obd-codes.com/trouble_codes/
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P2195 O2 Sensor Signal Stuck Lean Bank1 Sensor 1 P2196 O2 Sensor Signal Stuck Rich Bank1 Sensor 1 P2197 O2 Sensor Signal Stuck Lean Bank2 Sensor 1 P2198 O2 Sensor Signal Stuck Rich Bank2 Sensor 1

Read more at: http://www.obd-codes.com/trouble_codes/
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May 07, 2015 | 2006 Ford Taurus SEL

1 Answer

2006 Taurus 3.0 L. We changed the plugs and approximately 1 week later the check engine light came on w/ code P2197 "O2 sensor stuck at lean Bank 2 Sensor". I'm guessing it could be...


Why would you guess that ?
You know what you did

You went a week with no problem

The front (2) O2 Sensors ,if you have two &
dual exhaust ,get replace at 100,000 miles or
now, that you have an OBD dash light on.

Aug 14, 2011 | Ford Taurus Cars & Trucks

1 Answer

I recently bought a 98 Mystizue 6 cylindar with 95000 miles. The O2 sensor rear code came on and I had it replaced. the light came on 10 miles later. Next the mechanic checked it and said the O2 sensor...


Need the DTC code. Same code every time?

The rear sensor only monitors emissions, it does not control fuel mixture. Only the front ones do. frayed wires on the body harness are quite common since the O2 sensor moves as teh exhasut pipe shakes.

Jun 08, 2011 | 1998 Mercury Mystique

1 Answer

I have a 2005 Chrysler Town & Country with almost 100,000 miles. The check engine light came on about 2 months ago and the code said the O2 sensors needed to be replaced. About a month later, the...


there are no codes that say replace O2 sensors,or remove converter,Thats just somebody's guessing,When it says O2 sensor that tells the mechanic to look for trouble in that area,wiring or faulty readings,And there are four O2 sensors.

Jan 20, 2010 | 2005 Chrysler Town & Country

3 Answers

Engine warning light on Mazda MPV 2002


There seem to be 4 sensors along the way in the air intake and emissions system.

My Check Engine light indicated a bad sensor 1, bank 2 code (I think).

I had my mechanic replace the sensor that was indicated as faulty... cost = $191.

Then the Check Engine light came on again (with a different code), and I had to leave the van with him all day.

Cost to replace and install that sensor = $115.

My advice: if the Check Engine light stays on *AND* your vehicle is riding rough, get it fixed.

Otherwise, put a piece of tape over that Check Engine light and save a couple hundred dollars!

Hope this helps, I do trust my mechanic fully.

Aug 17, 2009 | 2002 Mazda MPV

1 Answer

Misfire, 2002 3.4 l, V-6, Grand Am, only after sitting out in sun


i would check wiring at injector 6 for a bad contact if ok test injector

Jun 22, 2009 | 2002 Pontiac Grand Am

1 Answer

P0420 and check engine light


A p0420 code is set when the computer determines that the catalytic converter isn't doing it's job. In almost all instances that code can't set as a result of a bad o2 sensor so they probably didn't have to be replaced. The catalytic converter will need to be replaced, prefferably by an oem part. This can be pretty expensive and should be considered before purchasing the vehicle.

I have replaced a few bad converters on late model subarus in the past few years.

Apr 18, 2009 | 2003 Subaru Outback

1 Answer

P0155 & P0135


O2 sensors are tricky. sometimes like anything else they fail. many times though the exhaust mixture they encounter is out of their range and that shows up as a failure.since you seem to have no other problems , I would go ahead and change them, but don't be disappointed if the code shows up again (at least you know it's not the sensors.) I don't like using the process of elimination when doing repairs but sometimes you must.

Mar 15, 2009 | 2004 Jeep Grand Cherokee

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