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P0420 code but passed emissions??

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P0420 code but passed emissions??

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Old 05-17-2018, 03:14 PM
Mini_slo
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P0420 code but passed emissions??

Hello, i have mini cooper r50, 2003, 116hp. The problem is that CEL is appearing every few days with the same p0420 code (Cat. efficiency bellow and uncorrect signal). I take a car to test the emissions and everything was perfectly okay so i assume that cat. is okay. O2 sensors readings: pre-cat: oscilating between 0,1-0,9v, post cat.: oscilating between 0,75-0,9v. Is there a possible problem with timing of the engine?
Thanks for your help.
 
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Old 05-17-2018, 05:50 PM
AZdsrt
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Here in AZ emissions testing is strictly by the OBD port. Would have never passed here.
 
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Old 05-17-2018, 06:02 PM
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Whine not Walnuts
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Going to move you to the Gen1 Stock Problems/Issues section.
 
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