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

Where it lives

For P013B, the description names the sensor as the part involved. The description of P013B puts it on bank 1.

Check these first

• An aged downstream oxygen sensor on bank 1
• A vacuum or exhaust leak near sensor 2
• Resistance in the bank 1 sensor 2 wiring
• A fuel delivery skew on bank 1
• A lazy oxygen sensor element

What to do next

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

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