What causes GM code 44?

Vacuum leak leaning the mixture Low fuel pressure from a weak pump or clogged filter Dirty fuel injectors with poor spray Exhaust leak ahead of the sensor skewing the reading

How do I fix GM code 44?

Check fuel pressure against specification under load Inspect vacuum hoses and intake gaskets for leaks Watch oxygen sensor cross counts on a scan tool through the ALDL port Repair leaks and fuel delivery faults before replacing the sensor Replace the sensor only if it stays lean with fuel trim and pressure normal

44 Oxygen Sensor Error Lean Condition Indicated

Q: What does GM code 44 mean?

GM code 44 — Oxygen Sensor Error Lean Condition Indicated. Applies to 1982-1995 GM cars and C/K trucks, Camaro, Corvette.

Make: GM (1982-1995)
Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: 1982-1995 GM cars and C/K trucks, Camaro, Corvette

How to read it

Code 44 reads as 4 flashes, pause, 4 flashes on the check-engine light. Jump terminals A and B on the ALDL connector with the key off, then turn the key on with the engine off and count the check-engine flashes.

What does GM code 44 mean?

44 — Oxygen Sensor Error Lean Condition Indicated. This code sets when your vehicle computer detects oxygen sensor error lean condition indicated.

Common causes of 44

Vacuum leak leaning the mixture
Low fuel pressure from a weak pump or clogged filter
Dirty fuel injectors with poor spray
Exhaust leak ahead of the sensor skewing the reading

How to fix 44

Check fuel pressure against specification under load
Inspect vacuum hoses and intake gaskets for leaks
Watch oxygen sensor cross counts on a scan tool through the ALDL port
Repair leaks and fuel delivery faults before replacing the sensor
Replace the sensor only if it stays lean with fuel trim and pressure normal