View Full Version : what is code 44?
10-21-2002, 11:04 AM
what is code 44?
10-21-2002, 11:17 AM
Trouble Code 44 indicates that the O2 sensor is showing a persistently high exhaust oxygen content (lean), despite the efforts of the ECM to increase injector on-time (thus increasing fuel delivered). Integrator and BLM numbers may indicate > 128 by a substantial margin.
Code 44 is set when:
O2 sensor voltage remains below .2 volt for 60 or more seconds
System is operating in "Closed Loop."
No Code 33 or Code 34
Possible causes include:
O2 sensor defective or lead shorted
Lean injectors (dirty or blocked)
Water in fuel
Exhaust leaks upstream of O2 sensor
Fuel pressure too low
Note: Presence of Code(s) 33 and/or 34 may indicate MAP problem. This should be the first suspect in the case of a Code 44 being set.
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