P1130: Definitions depend on the manufacturer — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
Lack Of HO2S Switch - Adaptive Fuel At Limit. Source catalogue definition; confirm applicability using vehicle service information.
Affected system: Powertrain
Symptoms
- Illuminated Check Engine Light
- Noticeable decrease in fuel economy
- Engine idling roughly or fluctuating
- Hesitation or stumbling during acceleration
- Visible black smoke from the exhaust
Possible causes
- Faulty Air/Fuel Ratio sensor
- Vacuum leaks in the intake system
- Contaminated or clogged fuel injectors
- Exhaust leaks upstream of the oxygen sensor
- Defective fuel pressure regulator
- Faulty wiring or electrical connection at the sensor
What to check
- Inspect the wiring harness and connectors for the A/F sensor for corrosion or damage
- Check for vacuum leaks in the intake manifold and associated vacuum lines
- Measure the fuel pressure to ensure it meets manufacturer specifications
- Verify the operation of the A/F sensor using a scan tool to monitor live data
- Test fuel injectors for proper spray pattern and flow rate
- Inspect the exhaust manifold and pipe for leaks before the sensor
Also written as: P1130-00, P113000 (some scan tools add the fault-type byte, e.g. -00).