Lack Of HO2S Switch - Adaptive Fuel At Limit

Where it lives

For P1130, the description names the switch as the part involved.

Check these first

• A lazy upstream oxygen sensor bank 1 that switches too slowly
• Fuel pressure that is too high or too low
• A dirty or faulty mass air flow sensor
• A vacuum leak on the engine
• A leaking fuel injector or fuel pressure regulator

What to do next

1. Read upstream oxygen sensor bank 1 voltage and response rate
2. Check fuel pressure against specification
3. Inspect the mass air flow sensor and intake for leaks
4. Check for a leaking injector or fuel pressure regulator
5. Replace the upstream oxygen sensor if it stays lazy
6. Clear the code and retest

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