OBD-II code · Body
B0166 HVAC Discharge Air Temperature Sensor
The HVAC control module reports an implausible signal from the discharge (vent outlet) air temperature sensor. This sensor verifies that the actual outlet air temperature matches the commanded value.
Is it safe to drive with B0166?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDischarge air temp sensor failed
- PossibleWiring or connector fault
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Discharge Air Temp Sensor, HVAC Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.