p0171, p0174, p1083, p1085
 

The truck's not running rough, or having performance issues, but suddenly started throwing these codes. Been looking through the forum for clues, and will be taking a look this morning, though I can't get under the car or do anything strenuous... still recovering from a concussion, and apparently have some spine issues now. If I don't find anything, I'lll give the list of possibilities to the mech when he takes it to fix the bumper.

:yawn: back to bed for me. Get tired easily now :P

Could be the MAF. If it is the MAF don't buy one of those cheap MAF on sleazebay or Amazon. Either get a brand new Siemens MAF or buy a use OEM Siemens MAF.

Could also be your DISA Valve.

I second the purchase of an OEM MAF. I did the cheap MAF and ended up having to purchase the OEM MAF a few weeks later.

Ugh... has to happen while I'm off work and semi-broke. I'll try to eliminate the cheaper possibilities first.

Mine had all the same issues. ran great. but setting codes. all tied to fuel curves. turned out to be the intake boot was split where it goes off into the CCV. $18 boot, and I was back to zero codes.

Clean the MAF first. Then clear the code and see if they come back. That's your cheapest option at the moment.

:iagree:

Hmm, the crankcase cap was a bit loose. Set it tight, cleaned MAF, cleared the code. 55km so far, no return of the code. Might have been the cap. MAF looks new, btw. Still gonna have the mech check out the intake boot. Fingers crossed.

MAF's clean electrical wires are light grey colored...when it's dirty, it's got like a black dust/fuzz on the wires . hopefully you sorted out the issue and the codes won't come back.

Thanks, guys... here's hoping ;)

Just for my future knowledge as I am pretty ignorant when it comes to these types of things; what is the MAF?

mass air flow sensor which is in the air intake by air filter housing you will see a plug connected to it.

Maybe I'm wrong but if you have that many codes it would be prudent to
get your indy to hook up the computer for a proper readout rather than
guessing then go from there.

^He did have them read, and they are related codes.
IMO, he did the right thing. No need to get a mechanic involved yet.

Sometime having the CEL or SES read by BMW specific software provides a lot more info then just a generic OBD II code reader.

Maybe I missed something but I don't see where he had them read.:dunno: So my suggestion still stands.
Let's not guess. Once he knows what the problem is and the OP get his finances together he'll know where to begin.

^Thread title states the codes, so I assume he did. Unless he can look at the SES/CEL and tell what codes are showing.

As I understand this all is well?

I seem to 'foul' MAFs fairly often I guess due to my setup. Several times the engine was acting up and I really couldn't tell the MAF needed cleaning but it worked fine after I did. No discoloration, looked shiny, only clue was it looked shinier after the cleaning.

Codes...no code xpert here, but I'm with QwikAg on getting them 'read' and defined via a quality investigation vs throwing parts at a basic code:
Imo, codes are basic alerts but not specific root cause(s) indicators, unless I am more dumb about codes than I thought.

I had code P 0172 last year, and after searching here and on the net, the list of possible causes and fixes was more than a half dozen possibilities, none of which really offered a root cause chart or tree list of fixes to do, in order..

I did do the first one on many lists and 'cleaned' my MAF though it looked like new, and also checked intake boot/connections etc. All fine in that situ, but still had the code, after another trip to have it read/cleared.

Then I took my X to a local indie, (he doesn't specialize in BMW et al but he has a couple of his own, and is a good local wrench and good friend). He read my code with a Launch X431 and a pricey BMW code menu program he has: he pulled 'sub code 12', exhaust camshaft sensor.

~$100 part, 5 min install, a hug and a tip, and it was fixed...

My anecdote is that the code being 'read' at AutoZone, et al, is not getting the info one may need to narrow down the problem and avoid parting a fix. And as I don't own some of the code readers that get mentioned on this site, I am not aware of those devices to dig into the situ and display a 'fix this' solution(s). But, basic codes are pretty vague, in my limited experience. I miss old carbs, and easy car/m'cycle repair. :D

If I am way off the mark here, this post is not meant as a debate or 'correction', and I am glad to be educated on codes and the root cause investigation process.

But, I am glad the Professor found a simple solution and a fix... :thumbup:
GL, mD

I did research the codes, and once the shop is ready to do the bodywork, my cousin the mechanic who also is a BMW owner will read the codes with his equipment (if the codes come back). All is well so far, though DISA, CCV, and other things will be replaced later this year, sooner if any of my prospective clients close and pay up in the near future, lol.