SROC276

Anyone know the difference between P2179 and P0174? Both say lean bank 2. 2 weeks ago as I started the car it was like engine was choking heavily and struggling to idle. Switched on an off for twice then it started without issue. Now as I was coming home the codes happened but car was running fine.

Could it be coils? A few months ago when I brought it into dealer, as they were bringing it out it threw a misfire code, they cleared it and nothing since then except the new codes thrown last night.

I have since cleared them myself with an obd tool.

Tune, carbonio intake running for about a year and no issues. I am running an ipe exhaust system which has the vacuum lines.

Merc63

Lean means air after the maf sensor.

Purge valve, intake manifold or other leak.

Could also need new o2 sensors as you have exhaust work. Id also pull plugs and see how they all look. Might be time for new plugs. How many km?

dc5itr888

I had a similar code P 171 and they changed out the intake maf gaskets to resolve it

mr747

Andrew start with 02 sensor

SROC276

Haha I am thinking same thing.....just reset code and drove hard 75 miles....no cel....hmm....weired. May just call amg tech to see if there's an issue we need to see. Never had a cel before and everything running well so far.

Total miles 35 of which 20k was with tune, intake and exhaust....no cel up to this point. Weired idling thing a few weeks worries me more than cel I got last night. I'll check coils and plugs for sure. Thanks guys

mr747

Keep us posted bud

dc5itr888

It will probably come back. I deleted the code the first time and it didnt come back until 36K for me

Critter

Check for leaks (engine running)around intake manifold with some type of combustible,spray brake cleaner or intake cleaner or even WD-40 around the edge of the manifold and other hose connections. If the idle is effected then possible you are sucking air from a line or gasket. Pulling the plugs and comparing color could narrow your search.
Good Luck

abcut973

The most probable issue for a lean code on our cars is the intake manifold leak. Then you look into the purge valve/plugs/MAFs sensor and last you think about your O2 sensors. GL

avery.whss

I just had my oxygen and A&F sensor, Purge valve done, did what you guys recommended...still says lean bank 1&2 ..my intake manifold was replaced 6-7 months ago...Screw it, the car can run lean, stupid computers i notice no issues @ all either, CEL just comes on 30-50 KM after the dealer clears it, maybe it's time for a new one

Ingenieur

Ignore it
Means nothing
Just AMG messing with you


Seriously, sounds like a common issue
Check all connections between the maf and engine
If not that most likely gaskets apparently

You can check for leaks with starting fluid

604 C63

I have had both of those. Repeatedly. I run a tune, K&Ns and a charcoal delete.
Check to make sure your airbox is PERFECTLY seated. Very finicky that way.
Make sure the hose from the box has the clamp fully tightened.
Clean your MAF's, noting that one faces up and one faces down.

And finally, this is the thing that did the trick for me. The screws that hold your airbox are aluminum and can only be used once or twice before they stretch. If you have any where it feels like they are stripped and never fully tightened they need to go. When you replace them, make sure to use some blue thread locker.

Then take it out and bang the holy crap out of it for awhile.

BTW the part number for the screws is 002-984-18-29. Odd lucking parts number I know, but thats whats on the MB invoice. You need 10 of them for a whole set, and here they are $1.42 each.

Ingenieur

I need a few of those screws
One or two of mine aren't biting/engaging properly

avery.whss

do you think from me taking off the stock boxes and putting on the carbonio ones a few times made the screws not usable? would that really cause it to flash a CEL? my MAF's are fine, the dealer checked them

604 C63

Yeah I do. My understanding is that if you do it the AMG book way those screws are a one time only thing. Psshaw. But still. If they arent biting they have stretched. If you can get that screw to feel like its in there, that airbox isnt clamped down as tight as it can be. Then what happens? More air gets in. The more air, the leaner you are. Voila. $1.42 each. Not much to lose just for trying, and it made a difference with me.

SROC276

Thanks for all the input guys.....will wait for next service and report it to amg tech. For now drove hard again for 50 miles and was even picked on by a dumb *** m5 driver who decided to tail gate me while I was cruising by literally a foot or less for no reason other than to show off and egg me on. Too bad the fool can only go in a straight line. In short, bye bye m5 and no cel so good testing day in general...

abcut973

You probably have air flowing in not measured by the MAFs.
Check your carbonio airbox for leaks at/or pass the MAF.
How is your fuel consumption? Your mpg should suffer.

avery.whss

put the stock boxes back on, i thought it was MAF to but it's not, ordered those screws..gonna see if that works..who knows, my MPG is actually pretty normal, car's not idleing weird, no lag, no nothing, runs perfect the dealer doesn't even know what's wrong they checked/replaced everything it could be

SROC276

Ok after over 1k miles, light is back on....threw a p2177 code and dealer had to change intake manifold gasket today....luckily under warranty...all done. Newer gaskets much better than older ones according too amg tech so he doesn't see this problem happening again moving forward.

SROC276

Ok 3 check engine lights later, mb replaced the intake gasket about a month ago. Got another p2179 code this morning. Car now with them as they need to pin point problem. My tech is real good so hopefully he should be able to find it. Intake fitment is fine so not sure.

mr747

What a pain in the ***
You u get it sorted bud

SROC276

Yup it is but the car ran fine without issue. Even had new plugs installed a month ago so not quite sure what it is as of this time. Hoping for a simple fix and a free one as it's under warranty lol. Told my teche can put the sls intake on my car if that's the problem....haha. Well see. Thanks man.

Jacob-63

change the maf Sensors. This is not a gasket problem. I had the same problem a while back. Its related to maf

SROC276

MAF's are fine according to tech. he checked and cleaned both when they replaced the intake gasket a month ago. After some searching, they discovered one o2 sensor (driver side upstream) was reading a lot slow than usual which could skew data throwing the lean code. Car has been fixed, will try out and see if it comes out again in a month or so.

roadtalontsi

I've never seen a maf replaced on a 63 motor.