Question about 1999 Toyota RAV4

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Error Code P0172

Stall when acclerate

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THE 02 sensors is stuck lean. at 0v. the ECU
goes max rich in this case. (compensates) 173 means ECU slammed rich due to 02 reading gross lean.
lots of causes.:
1: a bad 02 , say stuck at 0volts. ( over 100k miles they can to that)
2: exhaust leaks{cracks} near 02. and stuck at 0volts
3: dead or weak, or dirty MAF, causing illegal unmetered air. lean.
4: intake air system has gross air leak.

Posted on Feb 01, 2014

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Posted on Jan 02, 2017

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Hi. I went to autozone and diagnosed with code p0172 on my 2005 Lexus GX470. I have vsc trac, vsc off, anti skid, and check engine light on. The lights come on for about 100 miles and goes off for same...


You own a high end luxury vehicle as do I, 2005 ES330, the dealership is the best place to get Lexus problems fixed. With my own vehicle, I had a thermostat fault code come up, and like you it would reset itself and come back. The code said it was the thermostat and I queried it with my tyre guy. He also said it is a thermostat code. I said but it isn't overheating. He told me that the computers in Lexus are so clever they are actually looking for the water to reach x degrees in x minutes. He replaced the thermostat, the fault never came back. Anyway back to your P0172 Error code.

https://www.autocodes.com/p0172_lexus.html

Possible causes
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Faulty Mass Air Flow (MAF) sensor

The first thing I would try is that stuff that you add to your fuel to clean the injectors.

Read more: https://www.autocodes.com/p0172_lexus.html

Pull codes P0172/P0175, need help diagnoising - ClubLexus - Lexus ...

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Dirty Mass Air Flow Sensor P0171, P0172, P0174 Codes - YouTube

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A common cause for lean condition codes is simply a dirty Mass Air Flow Sensor. Since I have been testing ...

code p0172 on my 2005 Lexus GX470 Google Search

Mar 13, 2018 | Lexus Cars & Trucks

1 Answer

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

P0172...both banks running rich


This link may help you out.http://www.engine-codes.com/P0172.html

Mar 17, 2013 | 2003 Ford Taurus

1 Answer

Having accleration issues mostly going up hills. Just replaced fuel filter.


The knock sensor is famous for causing all sorts of trouble If you have a code for it, it probably needs to be replaced.

It could be a faulty sensor, valve or blockage in the EGR (tube) from a carbon buildup.

in some cases it may be a problem with the ecu

Jun 11, 2012 | 2004 Infiniti QX4

1 Answer

I have a few error codes for my 2004 dodge ram hemi 1500 4x4. they are po172, po300, and po304.


The p0172 is due to an O2 sensor in the exhaust seeing too much oxygen, the po300 is a missfire present and p0304 is cylinder #4 missfire, check plug and wire to #4 and repair, this should also take care of the p0172, if a cylinder is missing it is just pump air into the exhaust thus causing the code p0172.

Jan 13, 2012 | Cars & Trucks

2 Answers

Car skips and I have 2 codes showing up po172 and po174, can anyone help ?


These are 02 sensor codes Check for vacuum leaks. also check the vent solenoid on the EVAP system. This can stick open and cause a vacuum leaks.
Let me know Randy

Apr 26, 2011 | Ford Taurus Cars & Trucks

1 Answer

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

Speedometer sudenly stoppped working. now works intermittently. also shows check engine light. It is showing p0171 & p0172 codes. Lean and rich. seams like they contradict each other. occasionaly the...


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
OBD II P0172 Fuel System Too Rich (Bank 1).P0172 - System Too Rich (Bank 1) Essentially this DTC means that an oxygen sensor in bank 1 detected a rich condition.
When the code says that the Fuel System is "too rich," it means that the computer has been subtracting more and more fuel, which is called Long Term Fuel Trim. Ideally, the Long Term Fuel Trim should be close to 1 to 2 percent. When a code P0172 is set, it means that the Fuel Trim is anywhere from -15 percent to as low as -30 percent compensated. When this happens, the computer knows that there is an improper condition in the control of the Fuel System.


Thanks.

Feb 07, 2010 | 1996 Volvo 850

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