Is It Safe to Drive With a P0545 Code?
Common Symptoms of a P0545 Fault
EML on
DPF regeneration may not occur correctly
Possible loss of power
No immediate engine damage risk
Possible Causes of P0545
A P0545 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
EGT Sensor Wiring Short
Wiring shorted to ground causing low temperature reading.
EGT Sensor Failure
Sensor itself failed low.
Connector Short
Moisture causing short in sensor connector.
ECU Input Fault
ECU circuit reading the EGT sensor.
Why we don't list the exact part: A P0545 code tells you what's happening but not why. Replacing parts based on the code alone is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P0545 and Your MOT
A stored P0545 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure under current MOT standards. Even if the light temporarily clears, the code remains in ECU memory and can be read by testers.
Get the fault diagnosed and repaired first, then have the code cleared and confirm the light stays off before booking your MOT.