Well, knock on wood, I'm hoping I've finally licked it....
I've had a P0400 anfd P0404 code popping up for a long, long time. I had been scared away from the EGR valve itself, thinking it was hard to get to. (It's not!!)
I've tried most of the other solutions in this forum without any success. But finally I decided to do a dry run at a u-pull-it yard, and over a few weeks pulled and bought 4 different used egr valves. Took them apart, got to know them. I'm pretty good at pulling them now!
I would say the most surprising thing I learned was that some EGR valves have coolant lines running through them, and some don't. This was confirmed in another post above here.
So I go to pull my own, and I can't get the darn bolt to budge on the driver side. Smartly, I brought it to my favorite local shop. Took them 3 hours and $200 to break and then drill/tap that bolt out. But at least my $8 replacement egr valve has kept the CEL from popping on (so far).
If that fixed it, then at $208 I'm still way ahead of a lot of others. And I'm smarter now than I used to be!
I've had a P0400 anfd P0404 code popping up for a long, long time. I had been scared away from the EGR valve itself, thinking it was hard to get to. (It's not!!)
I've tried most of the other solutions in this forum without any success. But finally I decided to do a dry run at a u-pull-it yard, and over a few weeks pulled and bought 4 different used egr valves. Took them apart, got to know them. I'm pretty good at pulling them now!
I would say the most surprising thing I learned was that some EGR valves have coolant lines running through them, and some don't. This was confirmed in another post above here.
So I go to pull my own, and I can't get the darn bolt to budge on the driver side. Smartly, I brought it to my favorite local shop. Took them 3 hours and $200 to break and then drill/tap that bolt out. But at least my $8 replacement egr valve has kept the CEL from popping on (so far).
If that fixed it, then at $208 I'm still way ahead of a lot of others. And I'm smarter now than I used to be!