P1130moderate severityPowertrain
HO2S Circuit Low Variance Bank 1 Sensor 1
on 2011 Chevrolet Express 6.0L V8 Vortec · RWD
What this code means
The PCM detected that the upstream heated oxygen sensor on Bank 1 is not showing enough voltage variation during closed-loop fuel control. The sensor signal is too steady when it should be switching between rich and lean.
Symptoms
- Check Engine Light
- Poor fuel economy
- Failed emissions test
- Rough idle
Common causes
- Lazy or contaminated O2 sensor
- Exhaust leak near sensor
- Vacuum leak affecting air/fuel ratio
- Fuel delivery issue
Diagnostic steps
- Monitor O2 sensor waveform with scan tool
- Check for exhaust leaks near sensor
- Perform vacuum leak test
- Test fuel pressure
- Inspect O2 sensor for contamination
Repair notes
Replace upstream O2 sensor Bank 1. Check for exhaust and vacuum leaks.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1