Hello,
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
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)
http://www.freeautomechanic.com/ho2s-heated-oxygen-sensor.html
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