Question about 2002 Mercury Sable

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Check engine light. got 2 codes P0172 and p0175.

PEP BOYS read the codes for Free, got 2 codes P0172 and p0175. rich bank 1 and bank 2. the guys stated but wasn't sure it was an Oxygen sensor. what do the experts say. how hard to replace?

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  • acareccia Mar 04, 2009

    I should replace both 02 sensors? are you sure its not a Mass Air Flow?

  • Brian Rowe
    Brian Rowe Apr 22, 2014

    what if you already have new O2 sensors & still have code?

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

Posted on Mar 04, 2009

  • steve lemieux Mar 04, 2009

    well if he said they were the 02 sensors i would replace both. if he wasnt sure, i would take it to autozone for another scan to be positive whats wrong before wasting money

  • rsnook79
    rsnook79 Aug 05, 2012

    And leave it out??

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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 ...

https://www.clublexus.com > ... > IS Models > IS - 2nd Gen (2006-2013)Jul 6, 2013 - IS - 2nd Gen (2006-2013) - Pull codes P0172/P0175, need help diagnoising - My check engine light, VSC, and traction light all lit up yesterday. I pulled ... Title: 2GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,P0174,P0175; System Too Lean (Bank 1); 2006 MY IS350 [08/2005 - ] DTC System too rich ( Bank 1 & Bank 2 )
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Dirty Mass Air Flow Sensor P0171, P0172, P0174 Codes - YouTube

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https://www.youtube.com/watch?v=LJSx2cDoFn4
Jun 4, 2014 - Uploaded by RomanAutomotive
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

I get p0172 & p0175 for Chevy subruban 2008 lt 1500 engine 5.3 with oil gauge sings down when I stop and come up when I drive


oil gauge
check oil level
replace sender
replace oil filter
if no better check engine oil pressure
with gauge when hot
could be worn oil pump or bearings


EFI fuel system running too rich

first clean maf see if it improves

bank one
https://www.obd-codes.com/p0172

and bank 2

https://www.obd-codes.com/p0175

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Oct 24, 2016 | 2008 Chevrolet Suburban

1 Answer

2004 ford freestar engine light on , p0172, p0175 any idea. thank you


P0172 - System Too Rich (Bank 1)
The adaptive fuel strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a lean calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information. Fuel System.
  • Fuel Pressure Regulator (vacuum hose off, diaphragm leak, malfunctioning).
  • Leaking fuel injectors.
  • Fuel return line restricted.
  • Fuel rail pressure sensor (incorrect reading).
  • EVAP canister purge valve leak (when canister is full).
Base engine.
  • Engine oil contamination.
Air Measurement System.
  • MAF sensor (contaminated, damaged, or corroded connector).
View Freeze Frame Data to determine the operating conditions when the DTC was set. Observe the LONGFT1 and LONGFT2 PID(s). Refer to Section 2 , Adaptive Fuel DTCs Diagnostic Techniques for more information.

Jun 13, 2016 | 2004 Ford Freestar

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

1 Answer

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

1 Answer

P 0172 and p 0175


fuel system too rich #P0172 (bank1)
fuel system too rich #P0175 (bank 2) answers from code reader manual
I would check fuel regulator and fuel pressure readings

Dec 05, 2011 | GMC Sierra Cars & Trucks

3 Answers

Check engine light (emission system service required) Help?!?!


There may be problem with the mass air flow sensor (very common with Volvo). This causes the fuel system to malfunction.

You may have noticed increased fuel consumption, loss of power and general 'lazyness'.

Better to take it to authorized Volvo service for a checkup/fix.

Jan 13, 2010 | 2000 Volvo S80

4 Answers

Check Engine light is on my 1997 F150 with a small V-8. The tester returns codes P0171, P0172, P0174 and P0175. What does all this mean?


those codes are for lean engine condition look for vac leaks at the back of engine to the pcv valve could hear hissing noise with engine running also check egr valve to be stuck open also when was last fuel filter changed? hope this helps .

Sep 16, 2009 | 1997 Ford F150 Regular Cab

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