EsGee

There may be posts on this elsewhere...sorry if this is a duplicate.

I have a 2004 e55 that just recently had the "check engine" light come on (49,805 miles). I've read a bunch of articles since then and, without a proper diagnostic, think it may be the mass air flow sensor. Symptoms are, sporadic loss of power and the car stalled once at a stop...the dealer says that the MAF is around $780 and it's $140 for a diagnostic that will be applied to the price of repair if I proceed. I'm ordering new air filters now and am about to go to the second tank of gas since the light came on.

Does anyone have experience with the MAF replacement on this engine? Thoughts?

CWW

R-I-P O-F-F

Pick up an OBDII scanner on eBay for $100, and do all your future diagnostics yourself.

The MAF itself is nowhere near $700+ either, it's $141 including free shipping at autohausaz.com. And that's for the OEM Bosch unit, you can actually get cheaper than that if you go with a no-name brand (not that I would).

Here:

http://www.autohausaz.com/search/pro...0Mass%20Sensor

Find a new mechanic, pronto. You are getting ripped.

EsGee

there was no way I was going to pay that for the work at the dealer...i was right about to order the parts from autohaus...so now I'm also looking for the OBDII scanner, do I need one specific for that car...seems like there are models that work on several different cars, not sure which one to get?

AMGfan

Just from reading old post some time ago, I didn't think our E55's had MAF's.

https://mbworld.org/forums/showthrea...hlight=e55+maf

EsGee

I found the elmscan 5 from carplugs.com and ordered it...will now be doing my own diags...thanks for the help

mikey33

Hi. Just drive up to your local autozone or autoparts store and borrow their reader and they will have no problem letting you use it.

CWW

OBDII is great, it's about the easiest thing on the planet. There is a little trap door under the dash in the drivers' side footwell, and you just plug it in and then you can read and clear your own codes. Most of the time, it makes diagnosing problems pretty easy.

Max.H

Our cars dont have a MAF sensor. They run on speed density (MAP sensor) I think the guy is trying to bend you over or he is talking out of his %&**.

CWW

So the air flow is pre-programmed based on your speed, or what type of sensor does that system use?

Marcus Frost

No, air/fuel calculations are not based on flow, but density. MAF and MAP are two common methods of measuring air in order to calculate appropriate fueling. Our cars do not have MAFs, however the W210s did have MAFs. The link you sent is for a W210 MAF.

-m

AMGfan

by RFlow on 9/26/7

by Stephens on 4/2/4

by V12Godspeed on 6/18/7

Those are all the quotes I could find via search function...hope it helps.

CWW

That must be what the dealer was telling him then. Let me find a map sensor for this car.

AMGfan

I'd run like hell from this dealer if he doesn't know the W211 E55 doesn't have a MAF. If the car is out of warranty, I'd take it to an independent or if you mechanically inclined (not me) DIY.

PS Order all parts yourself if possible...don't go through MB. Usually, the prices are lower than MB's price (markups ). Good luck.

Yacht Master

MAP = Manifold absolute pressure w211 E55
MAF = Mass Air Flow, w210 E55

Have you had the fuel pump and cats recall done?
By all means get the codes and post them here.

Jakpro1

Yes YES, 100% no way our cars have a MAF sensor.

I just replaced my MAP sensor this weekend. Even rushing it to dealer, only was 50 bucks.

Might be about an hour or so labor as it's tricky to install (deep in engine)

Get the car to Autozone and have them read the codes and let us know.

Could be anything, but conditions sound a bit like crank position sensor to me.

We'll know more once you get us the codes.

Do a search for "crank position sensor"

You'll find lots of posts like this

Max.H

No, basically the fuel enrichment is based on density of air that the map sensor reads.

EsGee

so will the elmscan 5 ODBII scanner work for that car?

CWW

Yes. Any OBDII scanner would work, and it appears the one you selected does live-data as well, which is helpful. I think you'll be happy with it.

When you get it, read the codes and then come back and report them here. Then people will tell you what's wrong.

EsGee

is the OBDII interface in the driver footwell on the 2004 e55?

ray_huge

If you have a vacuum leak it can trip the same code that relates to the MAP sensor. This happened to me... when hooked up to Star system it would give me a MAP sensor error becuase of the leak. Check all your hoses. MAP sensors rarely fail.

EsGee

I've had the problem with the check engine light resolved. I took it to American Service Center, an authorized Benz dealer in Arlington VA (they were very professional and I had a great experience)...here is what the problem was.

There were 2 open recalls on my 2004 e55 that I knew about...

campaign 2008010001 - check catalytic converters and replace if necessary.
campaign 2008020001 - check fuel filter module and repair/replace if necessary.

Also, the diagnostic results were printed on my receipt... "TEST WITH SDS. TEST ME. TEST PURGE SYSTEM FOUND LEAK AT CHARCOAL CANISTER SHUT OFF VALVE. TEST VALVE LEAK DOWN BEFORE 60 SECONDS. REPLACE VALVE. This cost me $109.25 for the part, labor was free since they had the car already apart.

The dealer completed both campaigns and the valve replacement. Once this was done the check engine light was no longer on and the car ran much better, it also corrected the slight noise I was hearing coming from the exhaust system near the cats...(sounded like a leak, a quick faint exhaust popping sound). All work, minus valve was done under warranty since they were recall campaigns.

Peter_02AMG

that what I thought W211 don't have mass air. I thought i was miss inform but why would the stealer want to charge you for something you don't have in your car