MasterTuning Fault code dictionary (DTC)

P0471 — Exhaust pressure sensor: implausible value

Severity: Warning Can you drive? With caution: limp mode possible, have it checked soon Make: All makes (OBD-II standard)
MeaningThe sensor measuring exhaust pressure reports a value that does not agree with the other data. It is the sensor the entire particulate filter strategy relies on.
FamilyPowertrain (P)

Typical symptoms

Engine warning light on
Regeneration never starting or never finishing
Reduced power
Filter-full message on a clean filter

Common causes

Measuring pipes blocked with soot or disconnected
Sensor failed with age
Corroded connector
Genuinely clogged filter

What to do

Before touching the filter, remove the small pipes and check they are clear: it is the most common fault and takes half an hour. A DPF replaced because of a blocked pipe is the most expensive mistake possible on this code.

Frequently asked questions

What does code P0471 mean?

Exhaust pressure sensor: implausible value. The sensor measuring exhaust pressure reports a value that does not agree with the other data. It is the sensor the entire particulate filter strategy relies on.

Can I keep driving with code P0471 active?

With caution: limp mode possible, have it checked soon

Common causes — P0471

Measuring pipes blocked with soot or disconnected Sensor failed with age Corroded connector Genuinely clogged filter

How do you fix code P0471?

Before touching the filter, remove the small pipes and check they are clear: it is the most common fault and takes half an hour. A DPF replaced because of a blocked pipe is the most expensive mistake possible on this code.

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