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P0137 & p0171

  #1  
Old 01-07-2018, 04:01 PM
Mastermiller's Avatar
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Default P0137 & p0171

Here are the codes from my Elm-II and I have scanned it with a Bosch at the local parts store and used a friend's konwie. All the codes.
I have a 2002 Monte Carlo 3.4L and Now I'm curious about which one is the most likely cause of it running to Lean(P0171). I know I have a exust leak, So that's one issue resolved when I can replace the whole thing but I'm pretty sure this is not the main issue. Replaced 02 sensors last year with Bosch upstream and downstream sensors, Now I wish I went with A/c Delco since it's a GM.

I had the catlylic converter replaced last year with a magnaflow also since the honey comb was plugged up.

Any help would do for help on any code & Thank You.
 

Last edited by Mastermiller; 01-07-2018 at 04:04 PM.
  #2  
Old 01-08-2018, 02:45 PM
Monte Of The Month -- April 2012
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A faulting O2 sensor can make the car run lean.
 
  #3  
Old 01-08-2018, 03:12 PM
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Where's the exhaust leak? If it's before the sensor, you could be getting inaccurate readings and the car leaning out when it shouldn't.
 

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