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Hey im writingt hsi for a friend. He has got the 2 code P0133 which is from his downpipe but he jsut got this one p0420- catalytic 1/1 efficiency. I wanted to know what this could possibly mean?Thanx
 

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p0420 is also from his downpipe. he has no cat converter, right? 1/1 cat eff code means that the pcm detects the converter not doing it's job.
 
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