Strip brake light on the boot of an E270 mercedes only 2 thirds lights up how do i fix

Do you mean the centre brake light in the rear window? The standard brake lights on the right and left side of the car use a standard brake light bulb. The centre 'third' brake light is a sealed unit and has to be replaced as a complete fitting. Both jobs are easy enough to do yourself.

You can reset all lights by disconnecting the negative lead to your battery for about 30 seconds. This will reset them but if the problem is not fixed they will come back on in about 50 miles.

3rd brake lights are usually just held with 1 or 2 screws.if the clip or plastic it screws into is stripped,you can usually find a used part pretty cheap.it may just need to be screwed down.the metal clips may be found at a hardware store.

how to reset the service light on mercedes benz e270 cdi avantgarde

There is usually a fuse box in the spare wheel compartment, there is also one under the rear ,Owner's manual indicates fuse position

i found the solution to same problem here.
http://mbworld.org/forums/e-class-w211/314638-no-power-trunk-3rd-brake-light-license-plate-lamps-2.html
it was a easy fix, broken wires in the boot a common fault with mercedes.

Mercedes brakes are setup with a pad wear indicator on the pads, one of the four pads in the front should have had a wire attached to it ( as well as in the rear brakes if 4 wheel disc). If this wire is broken or was't re-installed on the new pads, this will trigger the light on your vehicle, if all the wirs are connected properly and in place i would suggest taking it to the dealer to have them take care of the light. Hope this helps

if your vehicle is still under warantee

Hi

I had a similar problem on my e270 cdi and fixed this by earthing the 3rd brake light . This has solved the problem . No more errors like : 3dr brake light and numbret plate light malfunction ...

Aubrey
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I was advised to go to Advance Auto (store) and tell them my problem. I did this, and the gentleman sold me a pack (4) square license plate nuts, #8 x 1/2" screws. the cost was $1.75. I popped the plastic nut into each whole and screwed the third brake light strip into place. No rattles!