Hi, have replaced No.1 oxygen sensor (2008 hyundai tucson 2.0L gasoline engine) erased code P0133, still after a while eng. chk amber light comes back on, please advise what to check next. Thanks Best regards Marco Monzon
The car has to be checked for intake and exhaust leaks first
if everything is fine fuel pressure will have to be check should be 49 psi at idle
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