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Matt, I'm trying to fix my car because I don't want to pay the outrageous labor costs mechanics charge to do the work when I'm perfectly capable of doing it myself. I just needed to know what and where I needed to start. I will be taking my truck in tomorrow to get the sensors checked and...

like you said, upstream from the o2 sensors. Dan mentioned where thethe o2 sensors are at, but I'm not familiar enough with the engine to know where that is. I do know where the EGR and DPFE are at, just wondering if that's what your saying is where I should be looking.

haha... pardon my ignorance, I just don't know where they are (not a car guy at all). If I check the EGR and the DPFE am I getting close?

Thanks Al... Upstream meaning where exactly? The EGR valve or the DPFE sensor? Thanks.

Thanks Dan... If I go get the codes again, will they specify which of the four oxygen sensors are bad? Are they all the same part? This is what I've found online...

okay... I found this diagram, and yes, it is the EGR valve. He may have been pointing to that as another thing that's wrong. He said it had 2 codes triggering my check engine light. In this diagram...

I've heard there are more than one. The one he pointed to doesn't look like any I've seen before. It kinda looks like a flying saucer with a hose or wire hooked to it. here's a picture I just took of the part in question...

I took my 1997 Explorer XLT (4.0L EFI) to the mechanic today to get a valve replaced. When I was there I asked him to check the codes because I have the check engine light on and I have to get emissions testing done in a month. He said it came back with a couple codes, he showed me but I don't...