P1138 PONTIAC Possible Causes
What does this mean?
- Faulty HO2S, Bank 1 Sensor 2
- Open or short circuit in Bank 1 Sensor 2 HO2S harness
- Poor electrical connection in Bank 1 Sensor 2 HO2S circuit
How to fix P1138 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.
Possible Symptoms
- Check Engine Light on (or service engine soon warning light)
P1138 PONTIAC Meaning
To control emissions, a catalytic converter converts harmful exhaust gas emissions into harmless water vapor and carbon dioxide. The Powertrain Control Module (PCM) can monitor this process using a heated rear oxygen sensor 2 (HO2S 2). The HO2S 2, located in the exhaust stream beyond the catalytic converter, produces an output signal that indicates the catalyst’s storage capacity. This signal indicates the catalyst’s ability to effectively convert exhaust emissions. If the catalyst is working properly, the HO2S 2 signal will be much less active than the signal produced by the front heated oxygen sensor 1 (HO2S 1).