O2 Sensor Circuit Slow Response Bank 2 Sensor 1

Where it lives

For P0153, the sensor sits on the circuit this code reports. The description of P0153 puts it on bank 2.

Check these first

• An aged upstream oxygen sensor on bank 2 sensor 1
• A contaminated oxygen sensor element
• An exhaust leak near sensor 1 on bank 2
• Resistance in the bank 2 sensor 1 wiring
• A fuel delivery skew on bank 2

What to do next

1. Watch the switch time on bank 2 sensor 1
2. Check for exhaust leaks near sensor 1
3. Inspect the bank 2 sensor 1 wiring
4. Replace bank 2 sensor 1
5. Check fuel delivery on bank 2
6. Clear the code and retest

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