Question about 2002 Nissan Quest

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I have a check engine light on. I changed both O2 sencers and the knock sencer and the check engine light still comes on. Now I have a 121 code on my reader.

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Check engine light is not a big deal unless it's flashing.
A knock sensor is never bad and if it was, it's no big deal either. Just $600 to replace for nothing.

Go to this site and read files & folders & ask questions and we will fix your concern.

Posted on Mar 13, 2009


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