Engine Error
P0166
O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
Severity
Low
Symptoms
Check engine light, incomplete emissions monitors
Common Causes
- Dead Bank 2 Sensor 3
- Melted wiring on exhaust pipe
- Unplugged sensor
- Blown heater fuse
How to Fix
- 1 Replace O2 sensor
- 2 Reroute and repair wiring harness
- 3 Plug sensor in properly
- 4 Replace blown fuses
Estimated Repair Cost
USD
$50
–
$300
Wiring repair: $100; O2 sensor: $150 - $300