P1153moderate severityPowertrain
HO2S Insufficient Switching Bank 2 Sensor 1
on 2021 GMC Acadia 2.5L I4 · AWD
What this code means
The PCM determined that the upstream O2 sensor on Bank 2 is not switching between rich and lean often enough during closed-loop operation. This is the Bank 2 counterpart to P1133 and the two codes are frequently seen together.
Symptoms
- Check Engine Light
- Poor fuel economy
- Rough idle
- Hesitation
- Failed emissions test
Common causes
- Faulty or lazy upstream O2 sensor Bank 2
- Exhaust leak near sensor
- Vacuum leak
- Fuel delivery issue
- MAF sensor contamination
Diagnostic steps
- Monitor O2 sensor switching rate with scan tool
- Check for exhaust leaks
- Perform vacuum leak test
- Test fuel pressure
- Clean or test MAF sensor
Repair notes
Replace upstream O2 sensor Bank 2. Check for exhaust leaks. Commonly appears alongside P1133.
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