Question about 2002 Nissan Sentra

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A few months ago my check engine light came on. Autozone said it was an oxygen sensor. It ran fine for a few weeks (i didnt have the cash to fix it right away) About 2 months later, it started having rough starts but ran fine once it was started. 2 months after that, It will only start after 20-30 minutes of trying to get it started and now stalls when idling. I have replaced 1 oxygen sensor but it is still having the same problems.

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With th o2 sensor it was runnig in open loop for a few months, my guess is the spark plugs are fouled, inspect them

Posted on Sep 14, 2010

  • cbarrett452 Sep 14, 2010

    Changed em. didn't really help.

  • starrface Sep 14, 2010

    sounds like the o2 sensor may not have been bad in the first place, i suspect you have a fuel delivery problem, check the pressure on start , idle and driving, it should stay constant, also do a leak down test, turn the key on engine off the pressure should remain, if not suspect a leaking injector

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