garajizOBD-II code · manufacturer-specific
P1155
Lack Of HO2S21 Switch - Adaptive Fuel At Limit
- System
- P1 — Powertrain (manufacturer-specific)
- Severity
- Minor (2/5)
- Can I keep driving?
- Usually safe to drive
What does P1155 mean?
P1155 is defined as “Lack Of HO2S21 Switch - Adaptive Fuel At Limit”.
You can usually keep driving, but have it checked soon so a small fault doesn’t become a bigger one.
Manufacturer-specific meanings
The same code can mean something different on some makes.
- Lexus: Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1
- Toyota: Air/Fuel Sensor Heater Circuit Bank 1 Sensor 2
- Ford, Lincoln, Mercury: Alternative Fuel Controller
- Buick, Cadillac, Chevrolet, Chrysler, GM, GMC, Oldsmobile, Saturn: HO2S Lean Average Bank 2 Sensor 1
- Volkswagen: Manifold Absolute Pressure Sensor Circuit Short To B+
- BMW: O2 Sensor Heater Circuit Intermittent Bank 2 Sensor 2
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This page is general information; an exact diagnosis needs measurements and a technician’s check.