P1150moderate severityPowertrain
HO2S Insufficient Switching Bank 2 Sensor 1
on 2001 GMC Savana 4.3L V6 · RWD
What this code means
The upstream oxygen sensor on bank 2 is not switching between rich and lean often enough. This is a GM-specific code similar to generic P0134/P0154 activity faults.
Symptoms
- Check engine light on
- Poor fuel economy
- Rough idle
Common causes
- Faulty upstream O2 sensor
- O2 sensor heater failure
- Exhaust leak
- Wiring or connector fault
Diagnostic steps
- Scan and record freeze frame data
- Monitor front O2 sensor switching
- Check sensor heater operation
- Replace O2 sensor if lazy
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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
P0005
Fuel Shutoff Valve A Control Circuit/Open
P0006
Fuel Shutoff Valve A Control Circuit Low
P0007
Fuel Shutoff Valve A Control Circuit High
P0008
Engine Position System Performance - Bank 1
P0009
Engine Position System Performance - Bank 2
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1