Question about Hyundai Cars & Trucks
Posted by Anonymous on
P0401 Exhaust Gas Recirculation Flow Insufficient Detected
Clogged passage or bad valve
Posted on Aug 10, 2017
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Posted on Jan 02, 2017
First the fault codes,
U110C is No Fuel Level Bus Message
U0155 is No Cluster Bus Message.
Unfortunatly you have to be able to communicate with the instrument cluster with your scanner to diagnoise and I do not think an aftermarket scanner can do this.
Posted on Mar 02, 2010
the code reader couldnt access the software so its a dealer only job ,we do not have this probelm in europe as a sensor probe is inserted into the exhaust pipe ,Only the dealer can access the diadnosis socket here in europe and new cars have to be accessed via the internet as not even the dealers have the software ,its to stop the chinese from hacking and selling the software over the internet so the ECU has a encryption chip that changes the codes used 3 times a second just like satalite TV card
Posted on Apr 24, 2011
SOURCE: Have 1999 Mercury Sable and failed emissions for P0401 code, I replaced the EGR Valve and had the code reset, service engine light came on again Approx 15 miles later. Took it to Auto Zone and they g
I am not surprized. The chances that replacing an EGR valve will fix a code P0401 on ANY Ford vehicle is about 1/2 of 1 percent. You most likely either have clogged up EGR ports in your intake manifold, or you have a defective Delta Pressure Feedback EGR (DPFE) sensor.
To find out which it is, apply vacuum to the EGR valve vacuum port with the engine idling. The engine should stumble and/or stall. If it does not, your ports are clogged. If it does, the most likely cause of your problem is the DPFE sensor. However, the EGR vacuum control solenoid could also be the cause.
You cannot properly test the EGR vacuum control solenoid without the proper equipment, but you can check to make sure that there is manifold vacuum going into one side of the solenoid and you can check to make sure that there are no breaks or leaks in the line that runs between the solenoid and the valve. If you find any of these, repair as necessary. If you do not find a problem with the vacuum lines, then you can take a "guess" and replace the DPFE. If this does not work, then you can "guess" again and replace the solenoid. If it still does nort work, then you probably have a bad electrical circuit to the solenoid (once again, requiring the proper equipment to diagnose).
Please also review the following article: What Else Could Be Wrong?
Posted on Nov 26, 2011
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