Ethan

Oh yes, did that. Used my "guitar string" pipe cleaners and picks and cleared all carbon build up in all of the lines and ports. The lines that are removeable were removed and thoroughly cleaned, and the ones that can not be removed were cleaned out. I might take it all apart again and see if any loose chunks have gotten wedged in somewhere, but hard to believe on a 50,000 mile motor that this should be such an issue.

Yea, replaced that too. That has been suggested a few times. I wonder if Bypassing it would do anything. Hard to believe that that little thing could cause all of these issues. What do ya think?

So I have replaced my whole EGR system. Replaced EVERY line, EGR, Solenoids, EVERYTHING. All seems to be functioning fine, running good, but still bad gas mileage. The Check engine light goes off for about 4 or 5 days then turns back on with the same EGR code. Is the next step new exhaust system? The exhaust has 238,000 miles on it, but the motor only has 50,000 on it. I'm stumped. Could it be a bad computer since I used the original one when I replaced the motor, or do you all think maybe the exhaust is just old and full of crud? Any info and or advise would be awesome. Thanks..

So I have replaced my whole EGR system. Replaced EVERY line, EGR, Solenoids, EVERYTHING. All seems to be functioning fine, running good, but still bad gas mileage. The Check engine light goes off for about 4 or 5 days then turns back on with the same EGR code. Is the next step new exhaust system? The exhaust has 238,000 miles on it, but the motor only has 50,000 on it. I'm stumped. Could it be a bad computer since I used the original one when I replaced the motor, or do you all think maybe the exhaust is just old and full of crud? Any info and or advise would be awesome. Thanks..

So I have replaced my whole EGR system. Replaced EVERY line, EGR, Solenoids, EVERYTHING. All seems to be functioning fine, running good, but still bad gas mileage. The Check engine light goes off for about 4 or 5 days then turns back on with the same EGR code. Is the next step new exhaust system? The exhaust has 238,000 miles on it, but the motor only has 50,000 on it. I'm stumped. Could it be a bad computer since I used the original one when I replaced the motor, or do you all think maybe the exhaust is just old and full of crud? Any info and or advise would be awesome. Thanks..

Out of nowhere my check engine light turned off this morning. Guess the ecu cycled and didn't find anything wrong, so reset itself! Now that I just jinxed myself, it will turn back on next time I start it..

I blew it out and the line was clear as can be..

I have a 97 legacy outback 2.5. Got the same code. Replaced EVERYTHING, and properly cleaned every hard and rubber line. Solenoid, EGR, and BPT replaced and vacuum tested. Still getting horrible gas mileage and the P0400 code pops up again and again. Even tested the O2 sensors on the multi meter, and they are operating perfectly. What the hell is next? Cat back exhaust? Or black electrical tape overy the check engine light?