DTC pending codes P1135 manufacturer contr. fuel air metering
advanced auto parts gave me these scan codes from my truck they felt it was the coolant temp sensor ,but the temp.gauge works fine it was a cheap part so I took there advise it didn't correct the problem I felt it was the after cat. oxy sencer I replaced it and that wasn't it. if I reset the check engine light by removing bat. terminal it will stay off for about 3 miles then comes back on any advise on what the real problem is ? this started after replacing the exhaust from cat back. that is why I felt I damaged the rear oxy sensor. any info. on what is giving this error code would help thank you