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What would cause catalyst system efficiency below threshold already had the catalytic converter and O2 senors replaced?
Wiki User
∙ 16y ago
You have spent quite a bit of money and still have the problem. Obviously the converter and the O2 sensor did not need replacing. Take the car to a professional who actually knows what they are doing, and stop throwing parts at the problem.
You have spent quite a bit of money and still have the problem. Obviously the converter and the O2 sensor did not need replacing. Take the car to a professional who actually knows what they are doing, and stop throwing parts at the problem.
Wiki User
∙ 16y ago
Wiki User
∙ 16y agoYou have spent quite a bit of money and still have the problem. Obviously the converter and the O2 sensor did not need replacing. Take the car to a professional who actually knows what they are doing, and stop throwing parts at the problem.
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What does the code P0420 mean in a 2001 Dodge Stratus with 2.4 engine?
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