Are there any problems with the EGR system?
The most common problems with the EGR system is a faulty EGR valve and carbon deposits restricting the EGR flow. The EGR valve needs to tested. The EGR passages need to be checked for carbon buildup and restrictions. Advertisement
What is the OBD code for insufficient EGR?
OBD II code P0401 Exhaust EGR Flow Insufficient The OBDII fault code P0401 means that the engine computer has detected that the Exhaust Gas Recirculation (EGR) system flow is insufficient. The EGR system redirects a small amount of exhaust gases back into the intake.
What causes code p0401 exhaust EGR flow insufficient?
The EGR passages could be restricted too. The EGR ports in the throttle body clog up very often. Ford:One of the common problems with many Ford vehicles that can cause the trouble code P0401 is a bad or damaged DPFE sensor(DPFE stands for Delta Pressure Feedback EGR).
How does the EGR valve position sensor work?
The EGR valve position sensor is built into the EGR valve and detects the amount of valve lift. The command value for the target valve lift is previously stored in the powertrain control module (PCM) so that exhaust gas recirculation can be optimized according to driving conditions.
The EGR valve position sensor is built into the EGR valve and detects the amount of valve lift. The command value for the target valve lift is previously stored in the powertrain control module (PCM) so that exhaust gas recirculation can be optimized according to driving conditions.
Why does my Honda Odyssey have insufficient flow?
In some 1999–2003 Honda Odysseys and 2003 Honda Pilots, the EGR system may become contaminated or clogged. If this happens, the vehicle may hesitate or surge during light acceleration, and the MIL (malfunction indicator lamp) may come on with DTC P0401 (EGR insufficient flow) or P1491 (EGR valve insufficient lift).
How does the Honda exhaust gas recirculation system work?
P0401 Honda Description. The exhaust gas recirculation (EGR) system reduces oxides of nitrogen (NOx). NOx is generated by high combustion temperatures. The EGR system lowers peak combustion temperature by recirculating inactive exhaust gas into the air/fuel mixture, thus reducing NOx emissions.