Tony Ludford
Rear sensor is used for fuel trim, if the Cats are missing, the faster switching is messing with the fuel trims, logging the code.
Needs BOTH cats, as one will pass MOT but die quickly, causing light to return.
Message Thread Kia Sportage 2.0 16v G4GC 2007 - Emission failure, code P0133 Bank 1 sensor 1 slow response - Fixed - Alan Potter January 10, 2017, 2:17 pm
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