garajizOBD-II code · manufacturer-specific
P1157
Lack Of HO2S21 Switch - Sensor Indicates Rich
- System
- P1 — Powertrain (manufacturer-specific)
- Severity
- Minor (2/5)
- Can I keep driving?
- Usually safe to drive
What does P1157 mean?
P1157 is defined as “Lack Of HO2S21 Switch - Sensor Indicates Rich”.
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.
- Buick, Cadillac, Chevrolet, Chrysler, GM, GMC, Oldsmobile, Saturn: HO2S Bank 2 Sensor 2 Lean System Or Low Voltage
- Citroen, Diğer, Peugeot: Lack Of HO2S22 Switch - Sensor Indicates Lean
- Jaguar: Lack Of HO2S22 Switches Sensor Indicates Lean
- Ford, Lincoln, Mercury: Lack of Downstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2
- Volkswagen: Manifold Absolute Pressure Sensor Circuit Power Supply Malfunction
- BMW: O2 Sensor Heater Circuit High Voltage Bank 2 Sensor 2
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This page is general information; an exact diagnosis needs measurements and a technician’s check.