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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

Vehicle: 2008 hyundai tucson 2.0 L gasoline engine,autom. trans.

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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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