What causes GM code 64?

Vacuum leak on the right bank Low fuel pressure or weak injector Exhaust leak pulling air into the pipe Aging O2 sensor reading slow

How do I fix GM code 64?

Read codes with a paperclip jumper and check fuel trim if a tool shows it Spray test for vacuum leaks around the intake and hoses Check fuel pressure against spec Inspect the exhaust manifold for cracks or leaks Replace the O2 sensor if it stays lean with no leaks Clear the code and road test

64 Right Bank O2 Sensor Lean Exhaust Indicated

Q: What does GM code 64 mean?

GM code 64. Right Bank O2 Sensor Lean Exhaust Indicated. Applies to 1988-1995 Corvette, Camaro, C/K trucks with dual exhaust.

Make: GM (1982-1995)
Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: 1988-1995 Corvette, Camaro, C/K trucks with dual exhaust

How to read it

Code 64 reads as 6 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 64 mean?

64. Right Bank O2 Sensor Lean Exhaust Indicated. This code sets when your vehicle computer detects right bank o2 sensor lean exhaust indicated.

Common causes of 64

Vacuum leak on the right bank
Low fuel pressure or weak injector
Exhaust leak pulling air into the pipe
Aging O2 sensor reading slow

How to fix 64

Read codes with a paperclip jumper and check fuel trim if a tool shows it
Spray test for vacuum leaks around the intake and hoses
Check fuel pressure against spec
Inspect the exhaust manifold for cracks or leaks
Replace the O2 sensor if it stays lean with no leaks
Clear the code and road test