O2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 1

Where it lives

For P015D, the description names the sensor as the part involved. The description of P015D puts it on bank 2.

Check these first

• A delayed upstream oxygen sensor on bank 2 sensor 1
• A vacuum or exhaust leak near the sensor
• Resistance in the bank 2 sensor 1 wiring
• A lean condition on bank 2
• A lazy oxygen sensor element

What to do next

1. Watch the lean to rich response time on bank 2 sensor 1
2. Check for vacuum and exhaust leaks
3. Inspect the bank 2 sensor 1 wiring
4. Replace bank 2 sensor 1
5. Check fuel trim on bank 2
6. Clear the code and retest

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