O2 Sensor Circuit Low Voltage Bank 2 Sensor 1

Where it lives

For P0151, the sensor sits on the circuit this code reports. The description of P0151 puts it on bank 2.

Check these first

• A short to ground on the bank 2 sensor 1 signal wire
• A failed upstream oxygen sensor on bank 2
• An exhaust leak making the sensor read lean
• Resistance in the bank 2 sensor 1 wiring
• A contaminated oxygen sensor

What to do next

1. Inspect the bank 2 sensor 1 wiring for a short to ground
2. Check for an exhaust leak near sensor 1
3. Test the sensor 1 signal voltage
4. Replace bank 2 sensor 1
5. Verify the ECM if the reading stays low
6. Clear the code and retest

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