I already went through that page and nothing. 3 mechanics mentioned the
vacuum leak, but wd40 showed no leaks. Wiring has not changed. This problem
has been a long time in developing, with backfiring, lack of power,
hesitation, feels like the ignition is intermittently dying, etc., but I
had no error code until today.
Well first thing to do is make SURE that the air intake is clean, that
the air filter is clean and that nothing is blocking the sensor. (Had
one a week ago that was acting wonky, Owner says, "it started doing that
after I installed a new air filter" Pulled it apart and the owner had
left a chunk of shop rag in the air intake tube!)
Next you can get a can of contact cleaner and clean the contacts real
well, also clean the sensor. Check the harness to the sensor for routing
as well. Seen a few that set codes because the wiring was run close to
the ignition and it was getting some strange pulses the ECM didn't like.
If you have access to a scan tool that will read real time data compare
what your seeing to the specs for the sensor.
Most of the range problems I get are due to either bad contacts or the
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