I recently had to replace a bad coil on the number 4 cylinder and the intake was obviously taken apart. The next day and about 30 miles later, the CEL comes on and it tosses out a p1131. I am completely stumped here as to why it continually pops up.
The runner mating surfaces were completely cleaned up and I even put a few coats of paint on the intake gaskets to get a good seal. All the couplers are tight and I even took a spray can of throttle body cleaner to the whole system and nothing. No vacuum leaks whatsoever. So can the O2 sensor itself be bad considering I drove it with a misfire for about 5 miles and possibly been damaged by the unburnt fuel? They are the original sensors as far as I know and have about 73,000 miles on them.
Right now I can erase the code and about 3 miles later, the CEL will come on.
The runner mating surfaces were completely cleaned up and I even put a few coats of paint on the intake gaskets to get a good seal. All the couplers are tight and I even took a spray can of throttle body cleaner to the whole system and nothing. No vacuum leaks whatsoever. So can the O2 sensor itself be bad considering I drove it with a misfire for about 5 miles and possibly been damaged by the unburnt fuel? They are the original sensors as far as I know and have about 73,000 miles on them.
Right now I can erase the code and about 3 miles later, the CEL will come on.
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