garajizOBD-II code · manufacturer-specific
P1156
Lack Of HO2S21 Switch - Sensor Indicates Lean
- System
- P1 — Powertrain (manufacturer-specific)
- Severity
- Minor (2/5)
- Can I keep driving?
- Usually safe to drive
What does P1156 mean?
P1156 is defined as “Lack Of HO2S21 Switch - Sensor Indicates Lean”.
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.
- Citroen, Diğer, Peugeot: Fuel Select Switch Malfunction
- Buick, Cadillac, Chevrolet, Chrysler, GM, GMC, Oldsmobile, Saturn: HO2S Rich Average Bank 2 Sensor 1
- Volkswagen: Manifold Absolute Pressure Sensor Circuit Open/Short To Ground
- BMW: O2 Sensor Heater Circuit Low Voltage Bank 2 Sensor 2
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This page is general information; an exact diagnosis needs measurements and a technician’s check.