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I'm getting a p0420 engine light on my car. And I recently replaced the cat and o2 sensors. Any Ideas?

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I'm getting a p0420 engine light on my car. And I recently replaced the cat and o2 sensors. Any Ideas?

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Answer #1 | 23/12 2013 17:29

Aftermarket converter will not be good enough for the computer to accept,especially imports.

Positive: 100 %

Answer #2 | 23/12 2013 17:25

Bring the car to the local dealer and have the ECM reflash or reprogram with the newest software.. Ps: Aftermarket CAT sometime will not work well...

Positive: 100 %

Answer #3 | 24/12 2013 20:33

That was some shiity random part replacing, wasn't it?

Positive: 75 %

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