P1134 PONTIAC Possible Causes
- Faulty HO2S sensor, bank 1 sensor 1
- Open or shorted HO2S bank 1 sensor 1 harness
- Poor electrical connection in HO2S bank 1 sensor 1 circuit
How to Fix P1134 PONTIAC Code?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
When is the Code Detected?
P1134 is set if the Powertrain Control Module (PCM) detects that the HO2S ratio is out of range.
Possible Symptoms
- Check Engine Light on (or Service Engine Soon warning light)
P1134 PONTIAC Meaning
The Powertrain Control Module (PCM) monitors the activity of the Heated Oxygen Sensor (HO2S). During the monitoring period, the PCM counts the number of times the HO2S switches from rich to lean and from lean to rich and adds up the time it took to complete all transitions. With this information, an average time for all transitions can be determined. The PCM then divides the rich-to-lean average by the lean-to-rich average to obtain a ratio.