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  1. #1

    Join Date
    05 Sep 2018
    2003 9-5 Aero
    Thumbs Up:   0

    new O2 sensor causing idling problems and misfiring

    I have a 2003 9-5 aero. The check engine light recently turned on along with an error code for the O2 sensor (bank 1, sensor 1). At that time I didn't have any noticeable problems with the car. It ran fine and idled fine. But I went ahead and replaced the upstream O2 sensor (Bosch OE). I then used an OBD scanner to check for codes and cleared them. Two codes detected, listed below.

    P0134 O2 sensor circuit - no activity detected - bank 1, sensor 1
    P0300 Random/Multiple cylinder misfire detected

    At this point I have a new O2 sensor installed, the check engine light is off and no codes appear on the scanner. However, it now has a problem idling. Each time I start the car it struggles to idle and right before it dies the engine revs and the tach surges. It sounds like it's misfiring as well. I haven't driven it since replacing the O2 sensor. I'm worried that it will die on me as soon as I pull up to a stoplight.

    Should I replace the downstream O2 sensor? There is currently a brand new upstream sensor and a 15 year old downstream sensor. Not sure if that would cause this problem. Has anyone experienced this problem after installing a new sensor? Thanks.

    0 Not allowed!
    Last edited by saabmonster; 05 September 2018 at 10:35. Reason: added error codes



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