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Re: 89 Chevy c1500 Oxygen Sensor Problems??
I chased a false "lean" code--maybe 43--at highway speed. As the defect progressed, the code would set at lower speeds. Started at about 65 mph, by the end it would set at 45 mph.
I checked "everything" that would put excess O2 in the exhaust stream--vacuum leaks, faulty AIR diverter valve operation, faulty fuel pressure. Replaced the throttle body thinking I might have partially-plugged injectors. The complete "tune up" thinking I might have mild misfire. O2 sensor operation at low exhaust velocity was fine--reasonable crosscounts, reasonable voltage range. After dicking with it on-and-off for two years, I finally just replaced the O2 sensor. Problem gone.
Tell me this:
1. Have you followed the GM diagnostic chart for your vehicle for Code 13? and
2. Have you put a REAL scan tool on the vehicle to inspect the data stream?
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