Engine Error
P0146
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
Severity
Low
Symptoms
Check engine light, vehicle fails emissions monitor readiness
Common Causes
- Dead O2 sensor
- Unplugged sensor connector
- Severed wiring harness
- Blown sensor heater fuse
How to Fix
- 1 Replace the O2 sensor
- 2 Reconnect plug securely
- 3 Repair broken wiring
- 4 Check and replace related fuses
Estimated Repair Cost
USD
$50
–
$300
Wiring repair: $100; O2 sensor: $150 - $300