Meaning:
The heated O2 sensor in bank 1 sensor 1 is giving a higher voltage reading than it should. For most vehicles, this code comes when voltage exceeds 1.5V.
Main Symptoms:
Generally doesn’t come with symptoms. However, in some cases, the Check Engine Light may come on, and fuel economy may reduce.
Possible Causes:
- Fuel temp is excessively high
- Short, open, or broken wire in the O2 sensor circuit
Diagnostic Steps:
- Visually inspect all wiring to O2 sensor for loose, open, or short connections
- Use a wiggle test to determine where the voltage drops out
- Using an OBD2 scanner, check whether sensor 1 of bank 1 is switching properly
Read More: OBD2 Codes List: Meaning, Fixes, and Free Download
