P0132 - O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)

An oxygen sensor circuit issue was detected.

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Code Overview

An oxygen sensor circuit issue was detected.

Common Causes

• Failing upstream oxygen sensor on bank 1 sensor 1
• Engine running rich from a separate fuel-control problem
• Short to voltage in the sensor circuit
• Sensor contamination affecting the reading

Symptoms

• Check-engine light with rich-running behavior
• Loaded-up idle or hesitation
• Poor fuel economy

Diagnostic Steps

1. Check for rich-running or injector-related companion faults first
2. Inspect the bank 1 sensor 1 harness for shorting or heat damage
3. Watch upstream sensor voltage behavior on the scan tool
4. Confirm the engine is not actually running rich before replacing the sensor

Repair Difficulty

Moderate

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