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Message: <blockquote data-quote="Red 97" data-source="post: 590439" data-attributes="member: 10715"><p>I just got some plug and plays from American Muscle that were 60 bucks. I ran it for years without them but now I bought a pair because of the running rich issue. I talked to a ford tech that said the rear O2s on the OBD ll cars do more than monitor and throw a light. If it reads out of normal the computer will make the motor go rich(safe mode) to prevent damage to the motor because it cant tell whats causing the problem. My light is still off and my gas mileage has emproved but I also got new front O2s and plug wires aswell so who knows. It dosnt smell as rich as it did either. Couldnt hurt to get a pair, esspecially with gas as high as it is.</p></blockquote><p></p>