p0401 code, need ideas

joecool85 · Dec 26, 2009

So my truck threw a p0401 this afternoon on my way home. Seems to drive normal, power is fine, getting 17mpg (had been getting 18-20 this summer, but it's winter now and with warmup time etc, I figured that is reasonable). Its a 2000 3.0 Flex Fuel, 4x4 5spd.

I read the p0401 is normally the DPFE not getting enough vacuum. I checked my hoses and they all look good. Would running some seafoam through the vacuum lines help? I'm not really keen on spending $50-100 on a new sensor unless I really have to.

Bob Ayers · Dec 26, 2009

A bad DPFE sensor will cause the same code.

McCormack · Dec 26, 2009

Yep, probably a bad DPFE sensor causing the code.

joecool85 · Dec 26, 2009

So you guys think it's worth the $$ to get one?

McCormack · Dec 27, 2009

Without testing no one can say a hundred percent for sure that your DPFE is faulty, but faulty DPFE's are a known problem on the 3.0 Ranger, and they throw a 401 code when they go bad, so you'll have to decide if it's worth spending the $ for a new one.

FWIW, a couple of years ago my '00 3.0 threw a 401 code and I replaced the DPFE and it fixed the problem.

joecool85 · Dec 27, 2009

Not a bad idea with the jy ones, but I found one for $68 at autozone and I have christmas money left over so if I need to get one I will buy a new one I think.

I blanked the code with my reader last night, drove it to church and back this morning (round trip 20miles) and it hasn't come back on yet. We'll see what happens.

p0401 code, need ideas

joecool85

15+ Year Member

Bob Ayers

15+ Year Member

McCormack

15+ Year Member

joecool85

15+ Year Member

McCormack

15+ Year Member

joecool85

15+ Year Member

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