What does P0401 password mean? discover what causes it and learn how to fix this examine engine password from a mechanic who has done it numerous times.

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This trouble password "insufficient EGR flow" method that there is not sufficient exhaust gasses flowing ago into the incoming air come the engine. EGR means "exhaust gas recirculation". The EGR system consist of three parts: EGR valve, DPFE (differential push sensor EGR) and also actuator solenoid.

Car manufacturers created this mechanism so currently burned exhaust gas have the right to flow ago into the engine (when the EGR valve is open) and lower the combustion temperatures. This helps reduce emissions.This OBD password basically way that the cars computer has do the efforts to open the EGR valve, but it can not get enough exhaust gas into the engine. EGR systems used to be regulated by engine vacuum via hoses and valves. Now many of lock are controlled by electric solenoids.

What reasons the P0401 Code?


EGR ValveBlocked EGR PassagewaysEGR manage (No or short Vacuum)Faulty solenoid or wiring

Less typical Causes

The car ComputerDPFE (Delta push Feedback EGR) ValveModulator Valve

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How to settle Engine code P0401

Each auto manufacturer has their own EGR system style but the most most likely two causes of this code space the valve chin or passageways (many times the input manifold will have actually very small passageways that get clogged with soot) that the exhaust gasses pass through.Many time this code is caused by clogged EGR passages, and also sometimes removing the sensor will give you accessibility to the clogged EGR passages.Another thing that you can do you yourself is to examine all vacuum hoses and all wiring going to the EGR valve. You can find a hose through a hole in the or you might find a connector that is no seated all the method or some wiring that has been rubbed through.

This fault code is a tougher one for a DIY mechanic to diagnose unless you have great experience and some committed tools. Many times this code will go away if you change the EGR valve (but not always). If you absence the an abilities or patience to diagnose this problem, friend can think about giving it a shot and also just replace the EGR valve.

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If you still have any type of unresolved vehicle problems or questions, you can ask one auto mechanic online. For expert answers specific to your vehicle"s make and also model, i recommend JustAnswer Car. They have a large pool of certified mechanics come answer your concerns for a tiny fee and you can additionally browse their answers to various other users because that free.