Fault-Code Library · Exhaust / DPF
P0471: Exhaust pressure sensor range / performance
The exhaust-pressure sensor signal is implausible for engine load, speed, and DPF pressure conditions.
Common symptoms
- •DPF warning
- •Reduced power
- •Frequent regeneration
- •Poor fuel economy
Likely causes
- •Blocked pressure pipe
- •Failed exhaust-pressure sensor
- •Wiring fault
- •DPF restriction
First checks
- •Read exhaust pressure at idle and under load
- •Inspect pressure hoses or pipes for soot blockage
- •Check DPF soot load and sensor wiring
Important
Confirm whether the sensor circuit or the DPF restriction is the root cause before authorizing parts.
A fault code identifies a detected condition, not a failed part. Confirm manufacturer-specific subcodes and live data.
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