[elysian]

My MIL check engine light came on and has stayed on for quite a while now. I finally decided to look into it.

I've been getting both error codes P0401 (insufficient flow detected) and P0402 (excessive flow detected). I initially thought it was a bad EVR solenoid and changed it out with a brand new one from the dealer and reset the codes. Less than 24 hours later, the two error codes came back on. Then I thought it could be a stuck EGR valve so I got a new one and swapped it with the old one. Same thing happened, the two codes came back on in less than 24 hours.

Has anyone else had the same problem? What else could it be?

Thanks for your help.