Exhaust Pressure Sensor Circuit Range/Performance
The P0471 code means the vehicle's onboard diagnostic system has detected: Exhaust Pressure Sensor Circuit Range/Performance. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
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Common Symptoms
- Check Engine Light on
- DPF regeneration issues
- Turbo performance may be affected
- Engine may enter limp mode
Probable Causes (Ranked by Likelihood)
- Clogged pressure sensor hose with soot Very High
- Degraded exhaust pressure sensor High
- Exhaust leak before sensor location Moderate
- PCM calibration issue Low
Step-by-Step Diagnostic Procedure
-
Inspect the sensor pressure hose/tube for soot blockage. Clean or replace if clogged.
-
Read sensor value at idle and compare to spec. Should show slight positive pressure.
-
Check for exhaust leaks between the turbo and the sensor location.
-
If hose is clear, replace the sensor.
Frequently Asked Questions
What causes range/performance on the exhaust pressure sensor?
Most commonly, the pressure hose from the exhaust pipe to the sensor becomes clogged with soot, causing inaccurate readings.
How do I clean the exhaust pressure sensor hose?
Remove the hose and blow it out with compressed air. If heavily clogged with hardened soot, replace the hose.
Can P0471 prevent DPF regeneration?
Yes, if the exhaust pressure reading is inaccurate, the PCM cannot determine whether the DPF needs regeneration or if regeneration is complete.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0471 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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