Question about GMC Caballero
Code 44 set on pre 1995 gm vehicles is a o2 sensor reading lean or bias to .2 volts or less. it could be the o2 sensor, it could be a vacuum leak making the exhaust have too much oxygen thus making the o2 sensor to read lean or put out a lean reading. If the o2 sensor is old 75k-100k it's probably time for a new one anyway. an exhaust leak near (upstream) to the o2 sensor can pull in air even though the exhaust is leaking out and fool the o2 sensor with the added oxygen also. you could also have a fuel delivery problem creating a true lean condition. there are ways a tech can test an o2 sensor to see if it's the sensor or a mechanical problem causing the code.
Posted on Sep 29, 2010
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Posted on Jan 02, 2017
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