P0471
ModerateP0471 — Exhaust Pressure Sensor Signal Out of Range
Description
What P0471 Means
Code P0471 indicates that the exhaust pressure sensor signal is out of its allowed range. The engine management system uses this sensor to monitor exhaust gas pressure, for example to assess diesel particulate filter operation or the exhaust gas recirculation (EGR) system. The fault may be caused by sensor failure itself or by clogged pressure lines. This code falls into the moderate severity category.
Symptoms
Symptoms
- The Check Engine light comes on.
- The engine may drop into limp mode.
Causes and fixes
Diagnosis and Repair
- Check the exhaust pressure sensor.
- Check the lines for clogging.
- Replace the sensor if needed.