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

and bank 2

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

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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.

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