HO2S Transition Time Ratio Bank 1 Sensor 1
2007-2007 Cadillac CTS 3.2L V6
The 2007 Cadillac CTS is equipped with a 3.2L V6 engine. Below you'll find detailed p1134 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The PCM detected that the upstream O2 sensor on Bank 1 has an abnormal rich-to-lean vs lean-to-rich transition time ratio. The time the sensor takes to switch in one direction is significantly different from the other, indicating sensor degradation.
Symptoms
- Check Engine Light
- Poor fuel economy
- Rough running
- Failed emissions test
- Subtle performance loss
Common Causes
- Degraded or aging O2 sensor
- Exhaust leak near sensor
- Fuel system imbalance
- Contaminated O2 sensor (coolant or oil)
Diagnostic Steps
- Monitor O2 sensor waveform for asymmetric transitions
- Check for exhaust leaks
- Test fuel pressure and trim values
- Inspect sensor for contamination
Repair Notes
Replace upstream O2 sensor Bank 1. Often appears alongside P1133.
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
P1134 on Other Vehicles
Common Questions
What does code P1134 mean on a 2007-2007 Cadillac CTS?
P1134 stands for "HO2S Transition Time Ratio Bank 1 Sensor 1". The PCM detected that the upstream O2 sensor on Bank 1 has an abnormal rich-to-lean vs lean-to-rich transition time ratio. The time the sensor takes to switch in one direction is significantly different from the other, indicating sensor degradation.
What are the symptoms of P1134 on a Cadillac CTS?
Common symptoms of P1134 include: Check Engine Light, Poor fuel economy, Rough running, Failed emissions test, Subtle performance loss.
What causes P1134 on a 2007-2007 Cadillac CTS?
Common causes of P1134 include: Degraded or aging O2 sensor, Exhaust leak near sensor, Fuel system imbalance, Contaminated O2 sensor (coolant or oil).
Last updated: March 2026