P0150
O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
This code indicates that the engine's computer isn't receiving the correct signal from the oxygen sensor located before the catalytic converter on the second bank of cylinders. This sensor is crucial for monitoring exhaust gases and optimizing fuel mixture.
O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
Common causes
- high
Faulty O2 Sensor (Bank 2 Sensor 1)
The oxygen sensor itself has likely failed, providing an erratic or no signal to the engine control unit.
Typical part cost: $50-200 part
- medium
Wiring/Connector Issues
Damaged, corroded, or loose electrical connections to the O2 sensor can disrupt its signal.
Typical part cost: $0-100 repair
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P0150.
Unlock causesFree forever · No credit card
First things to check
- 1Inspect the O2 sensor's wiring and connector on Bank 2 Sensor 1 for any visible damage or corrosion.
- 2Check for any exhaust leaks upstream of the Bank 2 Sensor 1.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P0150.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P0150.
Unlock related codesFree forever · No credit card
Frequently asked questions
What is the difference between Bank 1 and Bank 2?
Bank 1 is the side of the engine that contains cylinder #1, while Bank 2 is the opposite side. Sensor 1 always refers to the upstream (pre-catalytic converter) sensor.
Will replacing the O2 sensor fix P0150?
Often, yes. A faulty O2 sensor is the most common cause. However, it's important to rule out wiring issues or exhaust leaks first.
Get the full P0150 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.