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Originally Posted by ShawVAuto
Yeah, Beyond is right. It's probably your O2 sensors. The light comes on when something is causing problems with your emissions. The O2 sensors can be expensive. I believe the 99-02 Cougar needs 3-4. But have AutoZone or somewhere that will check your computer for free check it. If you need instructions on installation, let me know.
-Jamie D. Shaw
Shaw Vision Auto
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Hi Jamie. I had my car checked and this is the code they gave me PO42O Catalyst Efficiency Below Threshold (Bank1). I read one thread and said they had to replace the manifold. I guess a mechanis will have to explain it to me. Do you know anything about manifolds and are they expensive? Thanks