garajizOBD-II code · manufacturer-specific
P1143
Lack Of HO2S12 Switch - Sensor Indicates Rich
- System
- P1 — Powertrain (manufacturer-specific)
- Severity
- Minor (2/5)
- Can I keep driving?
- Usually safe to drive
What does P1143 mean?
P1143 is defined as “Lack Of HO2S12 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.
- Citroen, Diğer, Peugeot: Air Assist Control Valve Range/Performance
- Jaguar: Air Assisted Injector Control Valve Range Performance
- Buick, Cadillac, Chevrolet, Chrysler, GM, GMC, Oldsmobile, Saturn: HO2S Bank 1 Sensor 3 Lean Or Low Voltage
- Mazda: HO2S Bank 1 Sensor 3 Signal Below 0.45v AF Ratio Too Lean
- Volkswagen: Load Calculation Cross Check Upper Limit Exceeded
- Subaru: Pressure Sensor Circuit Low Input
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This page is general information; an exact diagnosis needs measurements and a technician’s check.