How do i disassemble and clean the EGR valve?
Usually P0401/402 are to do with a bad DPFE
sensor. What you can do to test if it really is giving too much flow is pulling the vacuum tube off the top of the egr
and feel for suction at idle. There should be none. If there is then you need to replace the EVR
vacuum solenoid). 99% of the time the DPFE
sensor must be replaced though.
If the EGR
valve is stuck open you will have a rough idle. Is this happening to you?
If you still want to clean the valve, it's two lower nuts and two upper bolts. Remove the valve. Make sure to replace the gaskets after you clean it.
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