Apr 182010


I  have service engine soon light, CarMD diagnostic tool shows OBD P0130 & P0171.  They have been on and off for about eight months now.  Every 30-40 miles the SES disapears then  shows up again after 30-40 miles. The car passed California smog test while the SES was off. The car fuel consumption is not that impacted.

Should I go ahead and fix it or just leave it? Thanks

  One Response to “Pontiac Grand Am 2003”

  1. I would fix it. The problem can be fixed by replacing the Bank One Sensor One(upstream, pre-converter) O2Sensor. The one that is in it now is intermittantly causing the problem and setting both codes.

    P0130 O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
    P0171 System too Lean (Bank 1)


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