What causes GM code 45?

Leaking fuel injector or high fuel pressure Saturated charcoal canister purging excess vapor Restricted air filter or intake Failed oxygen sensor stuck rich

How do I fix GM code 45?

Check fuel pressure and leak down against specification Inspect the air filter and intake duct for restriction Watch block learn and integrator values on a scan tool Test injectors for leakage before replacing the sensor Replace the sensor only if mixture stays rich with fuel control normal

45 Oxygen Sensor Error Rich Condition Indicated

Q: What does GM code 45 mean?

GM code 45. Oxygen Sensor Error Rich 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 45 reads as 4 flashes, pause, 5 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 45 mean?

45. Oxygen Sensor Error Rich Condition Indicated. This code sets when your vehicle computer detects oxygen sensor error rich condition indicated.

Common causes of 45

Leaking fuel injector or high fuel pressure
Saturated charcoal canister purging excess vapor
Restricted air filter or intake
Failed oxygen sensor stuck rich

How to fix 45

Check fuel pressure and leak down against specification
Inspect the air filter and intake duct for restriction
Watch block learn and integrator values on a scan tool
Test injectors for leakage before replacing the sensor
Replace the sensor only if mixture stays rich with fuel control normal