97 4.0 Explorer CEL codes 0401 AND 0402

[jangel]

My mom-in-law's 97 explorer (6 cyl. 4.0) is throwing 2 codes. 0401 and 0402. The weird thing is that one is insufficient EGR flow and one is excessive egr flow. Does sound like a bad EGR or something else?

The truck seems to be running fine. Is a bad EGR (if that is what it is) gonna leave her stranded at some point?

Thanks for any thoughts,
John

 

[Smartin949]

Having the same issue here John; light just came on yesterday. Did a little troubleshooting on this today (as much as I could figure out from the Haynes manual) with no luck. Keep me posted if you find anything out.

 

[jangel]

I'll have the car this weekend and will check for any clogs in vacuum hoses, dpfe and egr. If I find anything I'll post back.
john

 

[Smartin949]

Hey John,
I ment to reply the other day; after reading some other forums and post across the web, I decided to just go ahead and swap out the dpfe pressure sensor, got on at the dealership for 120 didn't want to have to swap it out again after 2 years like I would have if I had gotten it at auto zone, took 5 mins to do cleared the computer memory, fuse 11 in the fuse box in the engine compartment (big 20amp fuse) and it works like a charm.

Shane

 

[jangel]

smart, has your CEL come back on? if it's still off i'll try your fix this weekend.
John

 

[Smartin949]

Hey John,
Hasn't come back on yet. Seems to be working like it's supposed to.

Shane

 

[spinfisher]

re cel


What were your symptoms?? I've just have a cel for what seems like no reason , cleaned the MAF and disconnected the battery and replaced. Cleared the cel for about 20 miles then came back on! I went home cleared the code and clean the K&N filter now its fine I hope!

 

[Smartin949]

Just the CEL and the codes were the only symptoms that I had. Replaced the DPFE Sensor and haven't had problems since.

 

[jangel]

same here. cel and codes, no performance problems. i replaced the dpfe and so far so good. i just drove from fla to n.c. and no cel. fingers crossed.