P0132
O2 Sensor Circuit High Voltage (Bank 1, Sensor 1)
The upstream oxygen sensor signal is fixed at a high voltage, indicating either a continuously rich exhaust on bank 1 or a short to supply voltage in the signal circuit.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
Common causes
Ordered by how often each turns out to be the cause.
- Genuine rich running (leaking injector, high fuel pressure)Common
- Signal wire shorted to supply voltagePossible
- Sensor poisoned by silicone or coolantLess likely
Parts involved
- Oxygen Sensor Upstream
- Fuel Injector
- Fuel Pressure Regulator
P0132 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.