P0401 Code

**BillBoost37** · 08-10-2011

I kinda feel like you didn't follow the link. Please do, it's tough for me to push that on you w/o seeming like I am. I once saw a guy spend $400 on EGR's because folks shot in the dark on a forum that I wasn't welcome at. When the guy came to me with the code, I looked it up and found it to be flow. Then he said "I glued my map when I was doing..." A $20 sensor and it was fixed.

Pull the EGR to LIM tube again. Where it goes into the LIM, pull the part that is held by the bolt back down the tube a little bit. Now look at the tube where it starts to flare out. That's the typical area for a crack. It's also easy to hold it up for light to shine in there. If you see light..you have a crack.

**screechingdemon** · 08-10-2011

I had already checked the majority of the items in the link, but went ahead tonight and went thru it all and the only thing I found was that on both ends of the tube from the EGR to the intake had very small cracks running parallel with the flare, I didn't even notice it last night when I had it off. I thought about trying to JB weld them or seal them up but a new tube is only $25 and the local dealer will have it by Friday so hopefully that takes care of the problem. Thanks for your help.

**BillBoost37** · 08-11-2011

Typically the EGR tube at the point which you describe it..won't cause the issue. Have you done anything near the map that might have sent it to it's grave?

On the tube. I've seen people try everything. The only item that works is a new one.

**screechingdemon** · 08-11-2011

Originally Posted by BillBoost37

Typically the EGR tube at the point which you describe it..won't cause the issue. Have you done anything near the map that might have sent it to it's grave?

On the tube. I've seen people try everything. The only item that works is a new one.

The only thing I did to the car before this started was the weekend before I replaced the air filter. Wouldn't I be getting an additional code or have drive ability or running issues if it was the MAP? Car runs good, fuel mileage is still good, I just have the annoying code that keeps coming back.

**BillBoost37** · 08-11-2011

Not necessarily. I've seen it go this way. Looks like EGR, must be EGR. yet it ends up being the item that checks the flow of the egr.

The air filter change caught my attention. What did you change there. Standard panel swap out, new k&N, recharged oil filter?

**screechingdemon** · 08-11-2011

Originally Posted by BillBoost37

Not necessarily. I've seen it go this way. Looks like EGR, must be EGR. yet it ends up being the item that checks the flow of the egr.

The air filter change caught my attention. What did you change there. Standard panel swap out, new k&N, recharged oil filter?

Just a standard air filter, nothing special.