Is It Safe to Drive With a P0471 Code?
Common Symptoms of a P0471 Fault
EML on
DPF warning light possible
Possible loss of power
DPF regeneration may be affected
Possible Causes of P0471
A P0471 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.
Exhaust Pressure Sensor Degradation
Sensor has drifted outside calibrated range.
Sensor Pipe Blockage
Small pipe from exhaust to sensor is blocked with soot.
DPF Issue
Actual exhaust back-pressure issue due to DPF condition.
Sensor Wiring Fault
Wiring to the exhaust pressure sensor is intermittent.
Why we don't list the exact part: A P0471 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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P0471 and Your MOT
A stored P0471 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.