I have a 2001 Ford E-250. Please forgive the length of this. I have done a lot of research trying to figure this out and need to figure out what to look at next and can I (w/sons’ and husband’s help!) DIY it somehow?
Car was running terribly about 3 weeks ago. I ran the codes, based on those, I thought it was maybe an o2 seonsor - I had already replaced B2 S1 but figured maybe B1 S1 needed replacing too. When it would not go over 25 mph I paid a shop $100 to give their diagnosis: they said the o2 sensors were done but it was the DPFE sensor and it’s vacuum tubes, and that we have a couple of bolts broken off in the passenger side exhaust manifold.
Replaced the DPFE Sensor and hoses myself, have to save up to pay the shop for the manifold. Car still running hard to go over 30 mph. NEXT day, heading out on a trip, so not close to home, listened as some kind of back pressure blew the two vacuum tubes back off on the DPFE, and we continued the 8 hour trip at an agonizing 40 mph (it was able to go a tad faster W/O the DPFE tubes in Place!)
To try to test the Cats, I removed the one B2S1 O2 sensor I had replaced already and tried to drive it. Drove better- still took some time to get to 50, but still got there after about ¾ of a block. But could visibly watch the exhaust entering my cabin- not teneble to leave it out and drive it that way! Another few days of poking about and researching later, pulled the codes today: P0135, P0155, P0402 P1406, P1131, P1132, P1152, P0171, and P0174.
Running rich, running lean, not functioning at all (that is the one I replaced, removed, and put back in.) EGR Valve Pintle stuck. So! Never any codes about the cats or the DPFE sensor. But the EGR has come up twice. Pro shop said NOTHING about the EGR before even though the P0402 was there at that time too. So - should my next step be to try to clean carbon from the EGR pintle? Clean the MAF sensor (I’ve read that can be a cause to all this too), or work with the Cats?
And if we can go most important but still most economical to start I would be grateful. I can do a certain amount on my own but am on truly limited funds and have a family of 9 to drive around! Thanks.