Any help would be appreciated! My check engine light came on, so I took it to Autozone to have the code read. it gave a P0108, so I replaced the MAF sensor and reset the computer to clear the code. The light came back on, so I took it back to have the code pulled again and it gave the same code. I checked vaccum hoses, all the electrical connections and the light is still on. I'm not sure what else to check or if it may be a symptom for another problem. Thanks again for your help!
Code P0108
- Thread starter DHicks
- Start date
joegr
Dedicated LVC Member
Why did you replace the MAF for this code? The code is for the MAP, which is in the EGR assembly, not the MAF assembly.
While it could be a bad EGR assembly, it is more likely to be the vacuum line assembly going to it. It has three molded hard tube lines, two to the EGR and one to the fuel pressure sensor. Some of these get very hard and brittle and will break if you look at them wrong. Check yours. You can get the tube assembly for about $40, or you can try to patch yours with soft lines of the correct diameter.
If it is the EGR, I would go ahead and order the tube assembly too. Here are the part numbers.
3W4Z-9D475-AC EGR valve assembly $112
3W4Z-9E498-BA Connector (the three vacuum hose assembly) $35
While it could be a bad EGR assembly, it is more likely to be the vacuum line assembly going to it. It has three molded hard tube lines, two to the EGR and one to the fuel pressure sensor. Some of these get very hard and brittle and will break if you look at them wrong. Check yours. You can get the tube assembly for about $40, or you can try to patch yours with soft lines of the correct diameter.
If it is the EGR, I would go ahead and order the tube assembly too. Here are the part numbers.
3W4Z-9D475-AC EGR valve assembly $112
3W4Z-9E498-BA Connector (the three vacuum hose assembly) $35
I tried a couple of dealers around here (Lincoln & Ford) and they both said unavailable so I was forced to go the soft line route. I wasn't happy at first as I like to replace parts with the factory originals whenever possible. Then I figured with the soft lines I won't have to think about replacing them anytime soon! I can also work around the area and not be concerned about breaking the hard lines.
joegr
Dedicated LVC Member
Ford Parts Giant has them. I just ordered and installed one a couple of weeks ago.
joegr
Dedicated LVC Member
No, it's the 3W4Z-9E498-BA.
I think that the other one (9C490) is the one with the check valve for the brake booster.
Yep.
Thanks! I'll probably need it soon enough for my wife's '06!
joegr
Dedicated LVC Member
The one on my 04 is still fine. The one on my 06 fell apart when I went to make some comparison measurements. (I am intermittently getting P0108 on the 04. After a lot of testing, I am replacing its EGR valve, if they ever ship it.)
joegr
Dedicated LVC Member
In my case, it was the EGR valve assembly. The hose assembly was okay until I removed the valve. I had to replace both. The EGR valve assembly came with a new gasket. The gasket is metal and would have been reuseable if it had not came with a new one.
Little update on this. Had my friend replace the egr assembly and lines, fixed the code. He also took off the coolant line from the thermostat housing not knowing it was under pressure and showered the engine with coolant.
I asked him if he bled it and he didn't. It was the highest line, I think going to the degas. Not the throttle body hose.
It's been fine for about 100 miles. Should I still bleed the system?
Oh, and new belt is ordered...
I asked him if he bled it and he didn't. It was the highest line, I think going to the degas. Not the throttle body hose.
It's been fine for about 100 miles. Should I still bleed the system?
Oh, and new belt is ordered...
joegr
Dedicated LVC Member
No, I think you are good. BTW, that line is the engine air bleed line to the degas.