Chevrolet P1138: HO2S (Sensor 2) Voltage Too High
Is your scanner showing Chevrolet P1138?
No worries. We'll show you what it means and how to deal with it.
Chevrolet P1138: HO2S (Sensor 2) Voltage Too HighOVERVIEW
What Does The Chevrolet P1138 Code Mean?
The engine is in deceleration fuel cut-off (DFCO)
What Are The Potential Causes Of The Chevrolet P1138 Code?
- A rich exhaust–An overly rich exhaust may load the catalyst, causing high HO2S 2 signal voltages.
- Silicone contamination–Silicone contamination of HO2S 2 could cause a false rich condition.
Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:
Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!
GM, 2013, Service Bullettin – Prior To Any Circuit Testing.