P0152 Code: O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
🟠 Moderate severity · drivable
Drivable, but the engine may run rich and use more fuel. Fix it soon.
What P0152 means
The bank 2 upstream oxygen sensor is reporting very high voltage, which the computer reads as a rich mixture on bank 2.
Symptoms
- Check engine light is on
- Poor fuel economy
- Fuel smell
- Black smoke from exhaust
Common causes
- most common: Faulty upstream oxygen sensor (bank 2)
- common: Leaking fuel injector or high fuel pressure
- less common: Wiring shorted to power
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the bank 2 upstream oxygen sensor | Yes | $60–200 |
| Diagnose and fix a genuine rich condition | Mechanic | $150–500 |
Frequently asked questions
Can I drive with a P0152 code?
Yes, but the engine may run rich and waste fuel. Fix it soon.
What is the most common cause of P0152?
A faulty oxygen sensor reading high, though a genuine rich condition is also possible.
How much does it cost to fix a P0152?
$60–$200 for a new sensor, or more if a fuel injector or pressure problem is the cause.
Related codes
P0150
P0150 Code: O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
P0151P0151 Code: O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
P0175P0175 Code: System Too Rich (Bank 2)
Related guide: MAF Sensor Replacement Cost →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.