#pressure sensor
5 posts in Car Diagnostics blog about "pressure sensor" — OBD-II diagnostics, DTC codes, repair. ← All posts
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P0842 and P0843: transmission fluid pressure sensor A circuit
Before believing the gearbox has lost pressure, check the instrument that measured it. A faulty sensor turns a healthy transmission into an expensive quote.
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P2452 and P2453: DPF differential pressure sensor circuit
The whole DPF strategy rests on one pressure measurement. When that sensor is wrong, the ECU either regenerates constantly or never regenerates at all.
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P0451 to P0453: EVAP pressure sensor range and circuit
This sensor is the instrument that finds EVAP leaks. When it is wrong, the system reports leaks that are not there — or misses ones that are.
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AC not cooling: OBD-II diagnostics, refrigerant pressure, compressor and sensors
What OBD-II shows about the AC system: codes B1234, B10DA, high/low-side pressure, evaporator temperature, why "just add refrigerant" isn't always the answer, and how to diagnose the compressor clutch.
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TPMS via OBD-II: why the "yellow circle" turned on and how to diagnose tire-pressure sensors
Direct vs indirect TPMS, codes C0750, C0755, C2126, how to read individual pressure and temperature per wheel via OBD-II, sensor battery life, replacement cost.