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Troubleshooting code p0172 I replaced both oxygen sensors and engine light is still coming on?

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Take it to a autoparts to have it erase ok

Posted on Aug 24, 2010

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PO-139 I had that sensor change 3 weeks ago and the check engine light came on again this morning.Thanks


Probably replaced a good sensor. This codes could be from a bad sensor, a vacuum leak, or an exhaust leak before the sensor.

Dec 01, 2015 | 2006 Hyundai Tucson

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Light check engine obd p0172


Error Code: P0172
Fault Location:
Fuel Trim, System too Rich, Bank 1
Possible Cause:
Evaporation emission (EVAP) canister purge valve.
Fuel pressure.
Fuel Injector(s).
Heated oxygen sensor (HO2S).
Mass air flow sensor.
Engine coolant temperature sensor.
Element air cleaner, clogged.

Dec 08, 2013 | Toyota ECHO Cars & Trucks

1 Answer

Rich fuel mixture banks 1&2


Fuel sensors work in the hottest part of the exhaust and are difficult to remove after a period of time. Many mechanics apply a small amount of never seize to the threads to assist in replacement and future removal. However this affects the grounding of the sensor and can cause fault readings. Ask the mechanic if he did that and follow you idea that the sensors may aftermarket and not suitable for yoyr car

Jan 23, 2013 | 2002 Toyota MR2 Spyder

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2002 MR2 fuel system too rich bank 1 and bank 2


Peter. The dealer did diagnose the problem. They said the car needed all 3 oxygen sensors replaced. They were replaced and the car is now returning codes p0172 and p0175 which are the only 2 codes coming up when the check engine light came on. My question is if the dealer sold me the incorrect oxygen sensors could this cause the computer to incorrectly set the p0172 and p0175 rich fuel mixture codes. There are no other codes coming up. My plan at this point is to check and clean the MAF, check my fuel pressure, and also the TPS but I did not want to waste my time if it could possibly be that the new oxygen sensors where the problem. Any help would be appreciated.

Jan 21, 2013 | 2002 Toyota MR2 Spyder

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2002 dodge durango 4.7L SLT Plus with lack of power with service engine light on and p0172 error code


error code P0172: system too rich(bank 1)
In my opinion, replace the oxygen sensor.

Dec 13, 2010 | Dodge Durango Cars & Trucks

1 Answer

1996 chevy truck 5.7L has codes P0172, P0172 were


p0172 is--system to rich ( bank 1). an oxygen sensor on bank 1, detected a rich condition ( to little oxygen in exhaust ) v6-v8 - v10 engines, bank 1 is the side of the engine that has # 1 cylinder. causes could be a vacuum leak in a hose, a dirty or bad maf sensor, or fuel pressure or delivery problems.

Oct 29, 2009 | 1996 Chevrolet K1500

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Obd2 codes


ur p0172 code refers to ur oxygen sensor, most likly the rear .. and the p0420 code is a catalytic converter deterioration code... the p0172 and 420 can be related because that oxygen sensor is the one installed in ur cat converter.....u most likely will need to replace both the cat converter and oxygen sensor

Apr 10, 2009 | 1999 Acura CL

1 Answer

Check engine light. got 2 codes P0172 and p0175.


Unclip the 02 harness, then take out the 02 sensor. 5 minute job.

Mar 04, 2009 | 2002 Mercury Sable

2 Answers

P0172 and P0128 Error Code 2003 Trailblazer 4WD


PO172 means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). I would replace the thermostat first. The computer could be injecting too much fuel because it thinks it never gets to operating temperature. That may keep the light off.

Jan 28, 2009 | 2003 Chevrolet TrailBlazer

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