P0162 Code: O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)
🟠 Moderate severity · drivable
Drivable, but the sensor is not reporting correctly, so emissions and fuel economy may suffer until it's fixed.
What P0162 means
The computer has detected a general problem with the bank 2 sensor 3 oxygen sensor circuit. This downstream sensor, located after the catalytic converter, is sending a signal that is missing, unstable, or out of range. The exact failure mode varies, so a full diagnosis is needed.
Symptoms
- Check engine light is on
- Failed emissions test
- Slightly worse fuel economy
- Usually no noticeable driving symptoms
Common causes
- most common: Faulty downstream oxygen sensor
- common: Wiring or connector damage
- common: Exhaust leak near the sensor
- rare: Faulty engine computer (PCM)
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the bank 2 sensor 3 oxygen sensor | Yes | $60–200 |
| Repair or replace damaged wiring and connectors | Yes | $10–60 |
| Fix an exhaust leak near the sensor | Mechanic | $50–200 |
Frequently asked questions
Can I drive with a P0162 code?
Yes, the car is usually safe to drive. It mostly affects emissions monitoring and fuel economy, not safety.
What does a general circuit malfunction mean?
The computer knows the sensor circuit is not working right, but the signal problem isn't specific enough to say whether it's low, high, or missing.
What is the most common cause of P0162?
A failed downstream oxygen sensor, with wiring damage and exhaust leaks as the next most likely causes.
Related codes
P0163
P0163 Code: O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
P0164P0164 Code: O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)
P0166P0166 Code: O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.