P1166
Air/Fuel Ratio Sensor 1 Heater Circuit Malfunction
Chevrolet
Fuel and Air Metering
High severity
Moderate repair
Free on OBD DashX
Want real-world data on P1166?
See which problems come with P1166, how often it shows up in other vehicles, and how to fix it — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
What P1166 means
- Terminal voltage is a set value or less for at least a set time period when the power is drawn to the A/F sensor (sensor 1) heater
Log in to see the full breakdown
This is a manufacturer-specific code. Free CaRPM account, no card needed.
Symptoms
Causes
Related parts
Solutions
Log in to read more
Free on OBD DashX
P1166 on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
Open P1166 No sign-up needed · available in 10 languagesScan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.