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).
What causes a p0401 Ford to run out of gas?
P0401 FORD Possible Causes 1 EGR passage clogged 2 Faulty EGR Vacuum Modulator Valve 3 Faulty EGR Valve 4 Faulty EGR solenoid valve 5 EGR solenoid valve harness is open or shorted 6 EGR solenoid valve circuit poor electrical connection 7 Dead (Weak) battery 8 Faulty EGR temperature sensor and circuit 9 Exhaust gas leaks
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 does the OBDII fault code p0401 mean?
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. Read more how the EGR system works in this article. – clogged or restricted EGR passages.
What does p0401 EGR insufficient flow detected mean?
If you own a Honda and encounter a P0401 egr insufficient flow detected, follow these instructions. The P0401 code is defined as Exhaust Gas Recirculation Flow Insufficient Detected. The computer commands the EGR valve to open. An EGR position sensor is built into the valve to detect how much the valve actually opened.
Why is my EGR not working on my Honda?
Once the ports are clean, re-install the existing EGR valve, clear the codes and test drive the vehicle until it complete a drive cycle. For more on drive cycles, read this post. If the P0401 egr insufficient flow detected returns, the problem can be a bad EGR valve, bad EGR position sensor, or a wiring problem.
What to do if your Honda has a p0401 trouble code?
If the position sensor results don’t match the commanded value, the computer sets the P0401 trouble code. The first step is to remove the EGR valve and check the passages for carbon buildup or blockage.
How can I get the EGR valve to Hold Steady?
Just hook up a vacuum pump to the EGR valve while the engine is off and apply anywhere from 7 to 20 inches of vacuum and see if the EGR valve holds steady. If it holds steady for 5 minutes, chances are it is good. You need a hand-held vacuum pump in order to do this. A simple vacuum gauge will not do the trick.