Engine Error
P0140
O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
Severity
Low
Symptoms
Check engine light on, failed smog check
Common Causes
- Unplugged or damaged O2 sensor
- Melted wiring harness on exhaust pipe
- Failed downstream O2 sensor
- Blown heater circuit fuse
How to Fix
- 1 Reconnect sensor plug
- 2 Repair and reroute melted wiring
- 3 Replace Bank 1 Sensor 2 O2 sensor
- 4 Replace blown fuses
Estimated Repair Cost
USD
$50
–
$300
Wiring repair: $100; O2 sensor: $150 - $300