P0420 code but passed emissions??
#1
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.
Thanks for your help.
#2
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