P0132 Code: O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
🟠 Moderate severity · drivable
Drivable, but the engine may run rich and waste fuel. Fix it soon.
What P0132 means
The bank 1 upstream oxygen sensor is reporting high voltage, which the computer reads as a rich mixture (too much fuel, not enough air). This can be a genuinely rich-running engine — a leaking injector or high fuel pressure — or a sensor reading too high.
Symptoms
- Check engine light on
- Poor fuel economy
- Fuel smell
- Black smoke from the exhaust
Common causes
- most common: Leaking fuel injector or high fuel pressure (genuine rich)
- common: Faulty upstream oxygen sensor
- less common: Wiring shorted to power in the sensor circuit
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Diagnose and repair a genuine rich condition (injector or fuel pressure) | Mechanic | $150–500 |
| Replace the bank 1 upstream oxygen sensor if the engine isn't actually rich | Yes | $60–200 |
Frequently asked questions
Does P0132 mean the engine is running rich?
Often yes. The upstream sensor reads high voltage when the mixture is rich, so check for a leaking injector or fuel-pressure problem before replacing the sensor.
What's the most common cause of P0132?
A genuine rich condition, usually from a leaking fuel injector or excessive fuel pressure.
How much does it cost to fix P0132?
$150–$500 for a fuel-system repair, or $60–$200 for a sensor.
Related codes
P0172
P0172 Code: System Too Rich (Bank 1)
P0130P0130 Code: O2 Sensor Circuit Malfunction (Bank 1 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.