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Peter Bagley
Peter Bagley, Toyota mastertech
Category: Chevy
Satisfied Customers: 681
Experience:  master tech at Toyota dealer
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2002 chevrolet avalanche. I have been noticing a lack of

Customer Question

2002 chevrolet avalanche. I have been noticing a lack of power under hard acceleration and now my check engine light came on with a P0131 and P0151. I monitor them with my scanner and they fluctuate nicely nothing noticeably wrong?
Submitted: 8 months ago.
Category: Chevy
Expert:  Peter Bagley replied 8 months ago.

Hello and welcome to just answer. I value your input to my questions so I may better help you. The codes you supplied are for the o2 sensors the upstream ones The first ones . You can replace just one but the age of your vehicle I would strongly replace both bank i &2 as they won't be too far apart failing, I will supply you with a pic of all o2 sensors. Trouble Code's.....P0131 and P0151.......may mean that one or more of the following has happened:

  • Faulty 02 oxygen sensor
  • Short to voltage on O2 signal circuit
  • High resistance or open on O2 signal circuit

Possible Solutions

  • Replace faulty sensor
  • Repair short, open, or high resistance on 02 signal circuit
Expert:  Peter Bagley replied 8 months ago.

If you decide to replace the sensors yourself I would advise you to take care in what make you use as some aftermarket ones have been giving issues.

Customer: replied 8 months ago.
Would this create the power loss.
Expert:  Peter Bagley replied 8 months ago.

Yes definitely it will go into fail safe or closed loop and the ECU will take an average reading to run all other systems . This is what we do in shops ,always repair the obvious rather then scratching our heads and guessing.

Expert:  Peter Bagley replied 8 months ago.

Just checking in to see if you require further help if not could you please take the time to rate my help. Thank you.