Hi, so I got the dreaded P0401 fault code. But can't find the problem.
Judging from this readings (block 3), seems there is an obstruction on the flow.
I took a look at the EGR valve (disengaging the large black hose, etc.); a bit greasy inside but nothing else. While not a comprehensive inspection, seems diagram/solenoids are working just fine.
What may be wrong? Tempted to fully uninstall/clean the EGR valve (as I did 50k miles ago) but since it's PITA, I'd rather hear a second opinion.
Thank you for your input.
Judging from this readings (block 3), seems there is an obstruction on the flow.
I took a look at the EGR valve (disengaging the large black hose, etc.); a bit greasy inside but nothing else. While not a comprehensive inspection, seems diagram/solenoids are working just fine.
What may be wrong? Tempted to fully uninstall/clean the EGR valve (as I did 50k miles ago) but since it's PITA, I'd rather hear a second opinion.
Thank you for your input.