Is it likely that both failed at the same time?
newbie here at the forums, i've tried to do a search on this already, i know there are already a lot of threads on here, but this question is a bit different.
so here is the deal, car wouldn't unlock or start with smartkey, when i used valet key and opened the door, alarm would go off, but the smart key wouldn't work at all.
Anyways, got it towed the the Mercedes Dealership, they said it was probably the smart key, which they'll replace for $366.
Fine, they ordered it but said it didn't work.
So now they are saying it's the EIS ANNNNDDD the ignition interlock. How likely is it that both need to be replaced?? I already know after reading on the forums that I got ripped off about the price of the key, some members say that the key only costs $190.
So at this point, they are saying that replacing the EIS and ignition interlock will cost me an additional $2100. Which is bonkers, because that's 1/3 of the cars value.
I'm thinking that perhaps Mercedes broke the ignition interlock on accident, or doesn't really need to be replaced and are just trying to make their money off me.
Also, is $2100 a resonable price for EIS and ignition interlock? I've seen people on this forums get their EIS replaced for under $900.
I feel like i'm being punk'd, where is Ashton Kutcher?

Car has 140k miles on it.
Any thoughts on this??
here is the quote i got from mercedes at tysons to replace EIS on my 2003 C240 148k miles:
Replacement Smart Key: 305.66
EIS PART: $540
LABOR: $774
I still think I'm getting overcharged for Labor and part, as I've seen people have paid much less for them. Including the key.
I'm going to call around other MB dealers and get a quote from them, let's see what the difference is.
Have you tried your second key to unlock the car?
Have you tried to lock/unlock the car w/ the key at a very short distance from the driver side handle? (close proximity sensor can still work to unlock the car)
Have you had a tint done recently? :x
Have you tried your second key to unlock the car?
Have you tried to lock/unlock the car w/ the key at a very short distance from the driver side handle? (close proximity sensor can still work to unlock the car)
Have you had a tint done recently? :x
No tint work, Car wouldn't start, the key wouldn't even unlock it. Or even unlock the steering wheel. The Dealer told me I need to replace the EIS and key. So they replaced the key first to see if that's the issue, but it wasn't now it's the EIS. It's currently at the dealership.
I didn't have a second key to try it with before i took it to the dealer.
So the key will not turn the ignition or unload the doors? Are you sure the battery hasn't died?
The fact they were going to replace the ignition interlock when it wasn't broken gives you insight into the crooked dealer. Can you take it elsewhere? I realize that's not ideal but if you have the diagnosis in hand you could call other dealers for pricing.
Hopefully they will remove the key charge, but before they ordered it, i asked them "what happens if the key doesn't fix it, will I still have to pay for it?" and they said yes, because it was part of the diagnostics.
I'm calling around to other dealers to see if they can quote me a better price to replace the EIS.
Good thing I have free towing with my insurance.
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Interestingly I had the original key for my car fail a week or so ago. The key would unlock the car fine, but when I put it in the ignition, nothing...didn't energize or unlock to turn or anything. Was concerned that i would be facing an EIS isue myself. Found out later that it appears to be an intermittent issue now, coin toss on whether that key would work or not.
Since I have two more, I just swapped to one of those and dropped the other one in a drawer. Did find the intermittent issue interesting, though. And no trouble with either if the other keys, so I am confident it was the key
(worth noting that I cannot complain about the key that failed. 10 years, been under water at least twice, and last year got run over by a fire truck and was still working fine until this)

The key didn't fix anything. The initial dealer told me that it was the EIS, and the steering lock that needs to be replaced. 8 hour labor @ 129 dollars an hour, plus 957 for both parts.
After doing some research, I asked the Service Advice who was a complete jackass why I needed to get the steering lock replaced. His answer was "it's not damaged and doesn't need replacing, but it's a recommended service."
Really? Why not tell me that from the beginning. Anyways, without the steering lock, the part costs $613, but still 6.5 hour labor, which after looking at this forum, i decided that was too much labor to replace the EIS.
So i called around, and found another dealer, located 10 miles north of the initial one that will replace it in 2.5 hours.
He didn't say anything about the steering lock. So now my total comes down to $925 including tax to have my EIS replaced, he said he's not 100% percent sure though if it is in fact the EIS, because he didn't do diagnostics. But since the other dealer already said that it was the EIS, and this Service Adviser was fairly confident that it is the EIS, I just told them to go ahead with it. Let's see what happens.
Plus the $305, for the smart key...which didn't help...at all.
Little word of advice if you live in the Northern Virginia area, avoid the MB Service at Tysons Corner, I went with Alexandria, and they seem a lot more professional, and courteous.
I think the Service Advisor at Alexandria talked to me more about the issue in the 10-15 minutes then my service advisor in tysons corner did in a whole week.
just a heads up.
i'll post again once I get the car back, and if it was infact the EIS, and the end cost to replace it.



got kinda exited there when you said $70. I would buy some extra spare keys for my cars at that price