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MAF Sensor Replacement

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monarchd's picture
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Hello,

Need feedback please from somebody who has experience with 2001 E320 MAF replacement and/or cleaning. I recently had the car in at 70k miles for a B service and was advised to change the air filter. $100 for the airfilter replace (that's a another lesson learned the hard way) and at about 50 miles from the dealer on the way home the CEL comes on. Codes indicate fuel trim in bank 1 and 2 which from other posts is most likely a bad MAF. Had it reset at Autozone, it came back on a day later. I have a few questions.

1) could a new air filter (or the act of replacing it) have precipitated this failure or is this coincidence?

2) I see conflicting information in this forum on if this should be covered under the 8yr/80k emmisions warranty (I don't have access to my warranty book, it's in the car which is held hostage at the dealer). They want $605 to replace the MAF and they say the parameter values are not far enough out of spec to cover it's replacement under my extended warranty that I purchased to cover me Bump-to-Bump to 100k miles. Is the 2001 E320 MAF covered to 8yr/80k ???? I live in Florida.

3) It looks like this would be a fairly easy DIY job, saving $300.00 on my repair since I've seen prices for the MAF at about $300.00 on the net. Are there any pit falls to installing this yourself, ie computer issues, parameters that need reset, adjusted, etc. Last thing I want to do is replace it myself and still have the car run like crap, then go to the dealer with my tail between legs asking to fix it right.

Any quick advise would be greatly appreciated... I need to make decision very soon as to what I am going to do. As I said, the vehicle is in the dealer's possession and they are waiting for my decision.

Thanks, Terry

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mark cummins's picture
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The Mas should be covered under the warranty...Call MBUSA and or Your Extended Warranty
Place a call to the local dealer and ask the advisor who you worked with on the last visit re coverage...Re the Extended Warranty PLEASE read the coverage items listed as some exclude a LOT of Items like cat converters etc.
It should be covered under the MB 8/80 warranty

The W210s do have problems with the MAS !

Several MB Dealers are Now CLEANING the MAS with brake clean to avoid replacement..but its a Bandaid repair..If it has a code stored for it..Its time to replace it..its a Known Problem!

The only time I have seen a MAS code other than a defective MAS Voltage was a OVEROILED K/N Air filter

Anonymous
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Update to my original post.

My dealer insisted that the MAF sensor is not covered by either warranty (ie the 8/80 or my 100k-mi extended), because the parameters were not far enough out of spec????? However the car ran fine (even thought CEL light was on) when I took it in for the maintenance A, and then immediately after, ran very rough, with no power on hard acceleration. I negotiated with the Service Manager, explaining this circumstance, and got him to meet me half way on the price of the repair, ie $300 vs $600. They called it an "MBUSA Goodwill" discount. It seems to me that if this is a know problematic part, they should either A) have a recall, since it effects emmisions, B) replace for free when it generates codes and trips the CEL. After all, if the MAF is failing enough to trip the CEL, one would think this should coincide with the levels that they replace under warrantly. It all seems very fishy to me and maybe I should have pushed harder on the issue for a no-cost repair, but I needed to get my car back on the road. As usual, I never have enought time to mess around with this kind of stuff beacuse I rely so heavily on my car, and I live 50mi from my dealer. In any case, It definitely seems like a "buyer beware" situation, and leaves the door open for dealers to possibly exploit customers who don't do some research. I really wonder if I got a deal or not!!

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herky210's picture
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Timeout. There is a 8 yr/80,000 mile factory warranty on emissions on MB's?

I paid over $500 to the dealer on my 2000 E320 to replace the Mass Airflow Sensor and my car is less than 8 years and 80k.

Anybody clarify this?

Oh, and I think this could be a DIY - it's easy, but having to re-calibrate the computers is why I took mine to the dealer. Our 1994 E420 - we just DIY for that MAS and cleared the codes ourself. No re-calibration needed.

Although, I'm not sure if the re-calibration is necessary or if you could just use a ODB II reader to clear the codes, then say disconnect the battery and give the car a few hundred miles to re-calibrate on its own.

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Here is one of my posts from 9/06:

I have a 99E300TD with 107K. I had a MAF sensor go bad. I cleared the code and it stayed off for a very short time. I read some previous posts on how to clean the sensor. I got some electonics cleaner and gave it a try with a que tip, cleared the codes and drove it for about 300/400 miles. Went to start the car the next morning and there was the check engine light again. I bought a MAF sensor and replaced it. Light hasn't come on since, 2000K miles. The job took every bit of 12 minutes. I paid $165.00 for the MAF sensor. I called MB dealer and they wanted $300.00 for the part and another $200 for labor. My opinion, replace it yourself.

The light still hasn't come back and I havn't noticed a change in performance. I wouldn't try to clean it. I've viewed some other threads on other sites and this is a known problem. Another problem is the multi-plug on the transmission which I had replaced.

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lkchris's picture
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drperrier wrote:
Timeout. There is a 8 yr/80,000 mile factory warranty on emissions on MB's?

On all new cars legally sold in USA.

Federal law.

Anonymous
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I contacted MB Corporate to discuss my extended Warranty and the 8/80 warranty as it applies to MAF sensor failure. The MAF is not covered under the 8/80 emissions (not considered an emissions component since it's on the intake) but it is fully covered under my extended warranty to 100k miles purchased when I bought the car (Certified Pre-Owned). Under the Fuel Injection components section, my extended warranty specifically states that the MAF is covered, and I verified this with another dealer in the area. He states that as long as no mods have been done on the intake system, and the vehicle in general qualifies for warranty repairs, that it will be covered 100%.

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benzbum's picture
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Terry:

Sorry I didn't get to this sooner, but you did exactly what I was going to recommend - call MBUSA headquarters. When I bought my 2001 E320 4-Matic Wagon (CPO), I had some concerns about the complexity of the systems, particularly the 4-Matic system, the sealed transmission and the electronics. Because of that, I bought an MB extended warranty (5-year/100,000 bumper-to-bumper) from the dealer. A little over a year after I bought it, the radio quit on me. I took it to the dealer for replacement. The service advisor told me the radio wasn't covered under the warranty. I knew I had specifically asked about the radio and electronics when I bought the warranty (along with the 4-Matic components and the transmission) and I had been assured they were covered. I asked the advisor to double-check because I had been told the radio was a covered component under my extended warrantly. He didn't even take a breath before he told me it wasn't covered and he quoted me something like $600 to replace the radio.

I hadn't been thrilled by this advisor from the get-go. He seemed detached and his attitude didn't indicate he had any concern for his customer or their satisfaction. I didn't waste any time arguing with him. I told him I needed to think about it and that he would call him back with my decision within an hour. I promptly called MBUSA and relayed my conversation with the service advisor and my disappointment that I didn't think they were honoring my warranty. The MBUSA representative didn't miss a beat. There was no arguing. They promptly told me it was covered and that they would contact the dealer immediately and advise them to replace the radio under warranty. Not 10 minutes later I got a call from the Sevice Advisor to let me know that my radio would be replaced at no charge. He also indicated some displeasure that I had called Montvale and that they had called his managemnent. He indicated that he didn't know MB had changed the warranty and that radios were now covered under the CPO extended warranty.

Due to an installation error, the second radio shorted-out within a day and was replaced a second time. I have had no further issues with the radion or the warranty (window regulator subsequently replaced under warranty), although the Service Advisor is no longer employed by the dealer. I don't know the circumstances of his departure (I did not complain to the dealer about him, although I can see where others may have). I do know I have dealt with many dealers over the years and this particular dealership is exceptionally good. Their sales staff, parts staff, management, office staff, even the detail shop and "lot jockeys" are all exceptional people and it is always a pleasure to deal with them. This has been the lone bad experience I ever had with this dealership. I know no one at the dealership ever spoke ill of the Service Advisor in question, although they were rather abrupt in telling me he no longer worked at the dealership when I subsequently went in for service and requested any Service Advisor other than him.

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tdecker64 wrote:
He states that as long as no mods have been done on the intake system ...

Ah, the K&N filter exception!

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