Exhaust Pressure & Temperature Sensor Diagnostics.
Exhaust pressure and temperature sensor diagnostics in Taunton for DPF, regeneration and emissions-system plausibility faults.
Start With
Evidence.
Pressure and temperature sensors help the ECU judge exhaust conditions, DPF loading and whether regeneration can operate safely. Implausible readings can interrupt system operation even when the filter or exhaust hardware is not the root cause.
What You May Notice.
- 01Differential-pressure sensor or hose faults
- 02Exhaust-temperature values that are fixed or implausible
- 03Regeneration inhibited by sensor-related codes
- 04DPF loading calculations that do not match vehicle behaviour
What We Check.
- 01Compare sensor readings before start-up and during operation
- 02Inspect pressure hoses, connections and sensor installation
- 03Test reference voltage, ground, signal and circuit integrity
- 04Assess readings against engine load and regeneration state
Useful Context.
Blocked, split or incorrectly routed hoses can imitate sensor failure.
Exhaust temperatures must be interpreted in the correct operating state.
Replacing a sensor may require learned-value reset where specified.
Topic FAQ.
Can a pressure sensor cause a DPF warning?+
Yes. Incorrect differential-pressure information can affect soot calculations and regeneration decisions.
Why compare readings before the engine starts?+
Key-on values provide a useful plausibility reference before exhaust flow and temperature change.
Further Reading.
Relevant technical and consumer information from recognised external organisations. These links open on the publisher's website and do not replace vehicle-specific manufacturer instructions.
Checking exhaust-gas temperature sensors
Technical information about exhaust-temperature sensor function, signal testing and common failure symptoms.
Exhaust aftertreatment design and diagnostics
Technical background on DPF, SCR, NOx sensing and modern exhaust aftertreatment systems.
MOT manual: noise, emissions and engine warning lamps
Official MOT requirements covering exhaust emissions, emissions equipment and the engine malfunction indicator lamp.
Diesel particulate filters and MOT integrity
DVSA information about the purpose of DPF systems and their treatment during the MOT inspection.
Related Topics.
Tell Us What It Does.
Send the registration, warning messages and a clear description of the symptoms. Compatibility is confirmed before booking.