Replaced my low beam bulb
The part number is 17655.
It's a 2011 E550
I did not do it myself. While I have replaced bulbs myself on other cars, I was scared off by comments others made about the hassle of the drivers side light. I took it to an independant Mercedes shop here in Los Angeles. And indeed, it was a hassle, even for them, though admittedly, it looked like they had never replaced a bulb on the 212. You have to remove, or at least loosen some other parts, and even so, its a VERY tight squeeze to get in there to do it. I paid $120, which included the price of the new bulbs. It's about right; it took them about 30 minutes to do it. I do not regret the cost at all as I probably would have ended up breaking a bulb, either getting the old one out, or putting the new one in. ( I admire MCF for saying it was very easy. My guess is he must have small hands, or had a particular tool.) Anyway, I can see much better, though not nearly as well as in my other car which has the xenons.
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)Problem with some hyper white replacement bulbs (non Xenon units), is that they tend to not actually illuminate "better", just "brighter", and on some cars they look so flagrantly all over the place in how they shine, they seem to be brighter and more annoying mostly to drivers outside of the car, than to the person sitting behind the wheel of the actual said car.
The PIAAs are much better but still, particularly when it rains, nothing like xenons. As to the cost, while $120 seems high, it did include the cost of the bulbs, but more importantly it is a small price to pay to be able to see better at night. Without them, every night, I was irked by how lousy the lights were, and in the rain, more than a little nervous, particularly with the pothole issue.
I still don't see why anyone wouldn't spend the extra $1500-$2K on P2 though. The HID unit is very advanced, with active cornering, auto high beams, xenon lights, headlamp washers, and a nicer LED "disco ball" looking parking light unit. Also, the auto trunk (which isn't totally necessary, but cool and helpful), and Keyless Go are nice additions as well.
Edit: Just checked and it's a $2500 option (P2). I could have sworn it was less than $2K when I got my 10 MY.
Either way, still worth it.
When i got my C when it first came out in 2007 and i didnt want to wait a couple of months for the P2 packages i used the PIAA's first before finally getting a HID kit
When i got my C when it first came out in 2007 and i didnt want to wait a couple of months for the P2 packages i used the PIAA's first before finally getting a HID kit

The PIAAs are much better but still, particularly when it rains, nothing like xenons. As to the cost, while $120 seems high, it did include the cost of the bulbs, but more importantly it is a small price to pay to be able to see better at night. Without them, every night, I was irked by how lousy the lights were, and in the rain, more than a little nervous, particularly with the pothole issue.
I changed to PIAA Xtreme White H7s on my E550 and reaimed them straight ahead. I also drive at all times with the fogs on. This combination seems to sufficiently illuminate the road, particularly on rural 2 lanes, without blinding others.
Admittedly not xenons......they will be on my next E!
Can you tell me precisely what you did to re-aim your lights straight ahead? Do you mean just up, from where they were, or some other adjustment. And whatever you did, did it help, and how did you do it? Thanks.
Yes, I had seen your post. But what I wanted to know is whether the only adjustment is up and down, or there is some other adjustment that can be made such as left and right. I would like my lights to be more centered rather than on the periphery. Larry








