OBD-II code · Powertrain (generic)
P0145 O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
The ECU detects an abnormally high voltage from the third O2 sensor on bank 1. Indicates persistently rich exhaust, a shorted sensor or wiring shorted to a voltage source.
Is it safe to drive with P0145?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyRich exhaust (leaking injector, high fuel pressure)
- PossibleSignal wire shorted to voltage
- PossibleO2 sensor failed
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Oxygen Sensor B1s3, Oxygen Sensor Wiring
Related codes
- P0139O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
- P0153O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
- P0159O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
- P0165O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)
- P0142O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
- P0143O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
- P0144O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
- P0146O2 Sensor Circuit No Activity / Slow Response (Bank 1 Sensor 3)
- P0147O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
- P0148Fuel Delivery Error
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.