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Is 13, that stupid little "bung" sensor in the air boot, right before the air cleaner?
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Yes. Its values are testable with a VOM.
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2 Is testable, but my car shows no symptoms of this switch being faulty. But I have not tested it per factory, yet.
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Doubtful this is the problem
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3 is really interesting. That was one of my top guesses before I grabbed the codes. Because the ECU would think the car is always cold, and dump fuel accordingly. Thus preventing closed loop. I changed all of the sensors on the head when I did the head job two years ago, and thankfully I saved all of the old sensors! So it's just a matter of swapping that 4 pin bastard out! .....Lets see...
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Its values are also testable with a VOM. Do a search on this site to find the range of values for a given temperature. Mark