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Home/DTC Codes/Pontiac/Sunfire/1995-2005 2.2L I4/P1154
P1154

HO2S Transition Time Ratio Bank 2 Sensor 1

1995-2005 Pontiac Sunfire 2.2L I4

Moderate SeverityPowertrain

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

  1. Monitor O2 sensor waveform
  2. Check for exhaust leaks
  3. Test fuel trim values
  4. Inspect sensor for contamination

Repair Notes

Replace upstream O2 sensor Bank 2. Often appears with P1153.

Related Codes

P0153O2 Sensor Circuit Slow Response Bank 2 Sensor 1P1133HO2S Insufficient Switching Bank 1 Sensor 1P1133HO2S Insufficient Switching Bank 1 Sensor 1P1133HO2S Insufficient Switching Bank 1 Sensor 1P1133Air/Fuel Sensor Circuit Response Bank 1 Sensor 1P1133HO2S Insufficient Switching Bank 1 Sensor 1P1133HO2S Insufficient Switching Bank 1 Sensor 1P1133HO2S Insufficient Switching Bank 1 Sensor 1P1133Air/Fuel Sensor Circuit Response Bank 1 Sensor 1P1133HO2S Insufficient Switching Bank 1 Sensor 1P1133HO2S Insufficient Switching Bank 1 Sensor 1P1133Air/Fuel Sensor Circuit Response Bank 1 Sensor 1P1134HO2S Transition Time Ratio Bank 1 Sensor 1P1134HO2S Transition Time Ratio Bank 1 Sensor 1P1134HO2S Transition Time Ratio Bank 1 Sensor 1P1134HO2S Bank 1 Sensor 1 Slow ResponseP1134HO2S Bank 1 Sensor 1 Slow ResponseP1134HO2S Bank 1 Sensor 1 Slow ResponseP1134HO2S Transition Time Ratio Bank 1 Sensor 1P1134HO2S Transition Time Ratio Bank 1 Sensor 1P1134HO2S Transition Time Ratio Bank 1 Sensor 1P1134HO2S Transition Time Ratio Bank 1 Sensor 1P1134HO2S Transition Time Ratio Bank 1 Sensor 1P1153Air/Fuel Sensor Circuit Response Bank 1 Sensor 2P1153HO2S Insufficient Switching Bank 2 Sensor 1P1153Air/Fuel Sensor Circuit Response Bank 1 Sensor 2P1153HO2S Insufficient Switching Bank 2 Sensor 1P1153HO2S Insufficient Switching Bank 2 Sensor 1P1153HO2S Insufficient Switching Bank 2 Sensor 1P1153HO2S Insufficient Switching Bank 2 Sensor 1P1153HO2S Insufficient Switching Bank 2 Sensor 1P1153HO2S Insufficient Switching Bank 2 Sensor 1P1153HO2S Insufficient Switching Bank 2 Sensor 1P1153Air/Fuel Sensor Circuit Response Bank 1 Sensor 2

Other Powertrain Codes

P1154 on Other Vehicles

Pontiac Aztek

2001-2005 3.4L V6

Pontiac Bonneville

1990-1999 3.8L V6

Pontiac Bonneville

2000-2005 3.8L V6

Pontiac Bonneville GXP

2000-2005 4.6L V8

Pontiac Bonneville GXP

2000-2005 4.6L V8 Northstar

Pontiac Bonneville SSEi

1992-1999 3.8L Supercharged V6

Pontiac Bonneville SSEi

1992-1999 3.8L V6 Supercharged

Pontiac Firebird

1993-1997 3.4L V6

Common Questions

What does code P1154 mean on a 1995-2005 Pontiac Sunfire?

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 Pontiac Sunfire?

Common symptoms of P1154 include: Check Engine Light, Poor fuel economy, Failed emissions test, Subtle performance loss.

What causes P1154 on a 1995-2005 Pontiac Sunfire?

Common causes of P1154 include: Degraded O2 sensor Bank 2, Exhaust leak near sensor, Fuel system imbalance, Contaminated sensor.

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