HO2S Transition Time Ratio Bank 2 Sensor 1
2000-2005 Chevrolet Impala 3.4L V6
Description
The PCM detected an abnormal transition time ratio for the upstream O2 sensor on Bank 2. The sensor is transitioning faster in one direction than the other.
Symptoms
- Check Engine Light
- Poor fuel economy
- Failed emissions test
- Subtle performance loss
Common Causes
- Degraded O2 sensor Bank 2
- Exhaust leak near sensor
- Fuel system imbalance
- Contaminated sensor
Diagnostic Steps
- Monitor O2 sensor waveform
- Check for exhaust leaks
- Test fuel trim values
- Inspect sensor for contamination
Repair Notes
Replace upstream O2 sensor Bank 2. Often appears with P1153.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1154 on Other Vehicles
Chevrolet Astro
1995-2005 4.3L V6 Vortec
Chevrolet Avalanche
2002-2006 5.3L V8 Vortec
Chevrolet Avalanche
2002-2006 8.1L V8 Vortec
Chevrolet Avalanche
2007-2013 5.3L V8 Vortec
Chevrolet Avalanche
2007-2013 6.0L V8 Vortec
Chevrolet Aveo
2012-2018 1.6L I4
Chevrolet Beat
2018-2021 1.2L I4
Chevrolet Beretta
1990-1996 2.2L I4
Common Questions
What does code P1154 mean on a 2000-2005 Chevrolet Impala?
P1154 stands for "HO2S Transition Time Ratio Bank 2 Sensor 1". The PCM detected an abnormal transition time ratio for the upstream O2 sensor on Bank 2. The sensor is transitioning faster in one direction than the other.
What are the symptoms of P1154 on a Chevrolet Impala?
Common symptoms of P1154 include: Check Engine Light, Poor fuel economy, Failed emissions test, Subtle performance loss.
What causes P1154 on a 2000-2005 Chevrolet Impala?
Common causes of P1154 include: Degraded O2 sensor Bank 2, Exhaust leak near sensor, Fuel system imbalance, Contaminated sensor.