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Originally Posted by Hobbs
Bob thank a bunch. That web site was great and probable saved me a lot of money.
Results: code 44 which in my Chiltons says o2 sensor measuring lean.
Action: Change the o2 sensor, change the fuel filter (engine actually running lean due to clog. This car sat with a full tank for 5 years.)
Any other suggestions for fixing the code 44?
Thanks again.
Hobbs
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No problem at all sir, glad to help!
The important thing to remember when reading codes is that one may set of another, especially in the case of O2 sensor codes.
But, in this case, since you only have the code for the O2, I'd say it's a safe bet that the O2 is shot. Especially since the truck sat for so long.
Changing the fuel filter is a good idea. Maintenance never hurts.
The only other thing I could think of that would cause an O2 to read lean, but not spit out any other codes, is a vacuum leak. Spray some carb cleaner around the throttle body base, intake manifold, and vacuum lines. If there's any change in idle speed/quality when spraying around a particular area, you have a vacuum leak there, that will need to be repaired. Once it's repaired, disconnect the battery for five minutes or so to clear the computer's memory (and stored check engine light codes), and drive it for a while to see if the problem still persists.
On the subject of sensors, I've found that many of the aftermarket ones work fine for other areas (TPS, MAP sensor, etc), but I've had crappy luck with aftermarket O2's. I would suggest getting an AC Delco sensor, if you end up needing one.