I just got my truck a few months ago. Everything was fine till I threw the p2002 code. Partial filter below threshold bank 1. Now iv read up on here that it is usually associated wig AFE air filters but I don't have that. I'm still running stock air filter. I just changed it out today cleaned the filter box, cleared the code and drove down the road a few miles and it can on again. What can I do besides clearing the code and keep driving. I also have a 200thou mile diesel care warranty and I didn't know if it was the dpf if it was covered. Thanks for the help in advance.

 

if you have a stock air filter then you more then likly need a new MAF sensor.

 

If you are careful you can remove the maf and have a look at it. Element should be intact and clean.

 

Ok now this is my first diesel. What does the MAF sensor do?

 

Used to measure airflow...to control fuel mixture

 

Ok thanks man. I just figured I'd go thru my warranty to get it fixed. I got it so might as well use it up lol. I just can't wait for it to be up, then ill start with the big mods. Haha

 

MAF is what the dpf uses to self check. if the maf is bad it blames the pfe and sets a dtc for the dpf.

 

Sorry to get back to u guys do late I just got my truck back from the stealership. It wasn't my MAF apparently it needed a PCM update? I quote" perform PCM update per TSB- advise customer has after market muffle and tail pipe per ford ford if back pressure is off it will also set this code". Basically I guess my DPF banks tailpipe is an issue?? I'm not taking it off but how does that effect the DPF and what is a PMC update? They wouldn't explain it to me, it was close to closing time. I'm just pissed that $100 bucks later for labor for a simple update?!?

 

first off its a pcm update. second calling people theifs when you have no.. i mean 0 clue how something works makes you seem like an.... well anyway best of luck im out on this, i wont help people that degade everone around them do to their own ignorance

 

When the tech hooked up to your pcm it probably called for an update. This is the least evasive method to start with.

And the one that I would certainly prefer....rather than something else.

As far as your Banks exhaust. Very unlikely and I have never ever heard of the banks exhaust ever causing this....but from a tech point of view it is a possible cause and he needs to make note of it.

 

Hold on a second man i appreciated your help here on fte it's a great site to use. But the people at ford weren't helpful at all. No explanations even tho I asked. Me and my family have owned fords since our first cars. It's frustrating when you want to learn and no one will explain. I didn't mean any disrespect to you as a ford mechanic. For that I'm sorry. They fixed it and thats great, but wouldn't take the time to explain anything to me.

 

Thank you senix. I agree that it was a simple fix and I'd rather it be that than a huge job, just sucks it was $100 bucks worth. Oh we'll, and I didn't think the banks exhaust would do that. Thanks for the help.

 

ok here ya go...
pipe length is a direct effect on back pressure, moding tips going for a double to a single also changes pressure. making the stock pipe shorter or longer has the same effects. the trucks it effects is random just as the symptoms. I had one with a modified pipe that didnt like the egt readings that resulted from it.
the maf is the corralting sensor used by the pcm that dpf base pressue is set by. its calculated.. basicly what that means if dpf reads flow wrong then everthing else is wrong.
then there is the pfe sensor in the pipe that can pick up changes in flow (backpressue) ther pfe is a calibrated flow rate sensor. a change in flow will result in a change in readings.
I hope this is somewhat clearer then mudd.
so far as the update goes. they did expand some of the perameters the pcm uses and a bunch of other changes. your pcm is now at the latist calibration as all pcm updates rewite to the latist files wich includes all update to current level.
if this is not clear let me know what your not getting and ill try to explain better.

also note if you have a real issue the update wont help you, but is is the correct first corse of action

 

I'm understanding this now. Had to read twice. But with a bolt on banks DPF pipe back will in the long run effect this again? I just bought the truck a few weeks ago. And it came with that exhaust pipe. Previous owner never had this problem. I just hope it's not a start to more trips to the shop.

 

yup you got it.
imo you still have a bad maf.