OBD Engine Oil Temperature Sensor B Range/Performance
What it means
P01BA stands for Engine Oil Temperature Sensor B Range/Performance. P01BA is a P code, so the fault sits in the engine, transmission and emissions systems. For P01BA, the second digit places it in fuel and air metering. For P01BA, work through the cause list below, cheapest checks first.
Where it lives
For P01BA, start at the sensor the description names.
What to check first
For P01BA, read the stored codes from every module, not just the engine, because related codes often name the same fault more precisely.
Check these first
- P01BA: Faulty or contaminated sensor in the fuel/air metering circuit
- P01BA: Damaged or shorted wiring or connector for the affected circuit
- P01BA: Vacuum leak or intake system restriction
- P01BA: Failing fuel pump, injector, or fuel pressure regulator
What to do next
P01BA reports from the fuel and air metering system. These steps cover P01BA in general, and the exact cause on your vehicle can differ from the cause named above.
- P01BA: Read freeze frame data and related codes with an OBD-II scanner
- P01BA: Inspect the affected sensor wiring and connector for damage
- P01BA: Compare live sensor readings (fuel trim, airflow, temperatures) to manufacturer specs
- P01BA: Smoke test the intake system if lean or vacuum conditions are suspected
- P01BA: Replace the failed component after confirming it with live data
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.