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Wife's 2000 NB 2.0 has intermittently shown this code over the past few weeks. I'll clear it and it will come back a few days later. Where should I look first?

TIA
 

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a.k.a. porkchopzz4
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890 Posts
It is referring to reading a too rich condition on the front O2 sensor. So most likely this is either a bad O2 sensor or a bad MAF causing it to run rich.

Some other causes which may be less likely but still possible:

+ Vacuum leak on FPR (this is the little hose under the plastic engine cover running from the intake to the FPR)
+ Bad temp sensor (this would cause the engine to always think it is cold and therefore run in the equivalent of "choke" mode).
 
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