W203 key problem

Mick taylor

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C200k 2002. 2.0
Hi. My car is a 2002 C200 kompressor. W203. My problem is when I put the key into the ignition it doesn’t always unlock the ignition/steering. Sometimes it’ll work second or third time but other times I can put the key in and out 20 or 30 times before the solenoid clicks. I’ve tested the battery and it’s producing over 12 volts. Is it the key or the ignition switch that is faulty? Thanks in advance for any light you can shine on this problem.
 

GlosRichCLK

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2019 W177 A180 SE auto, 2012 W212 E350 CDi Sport saloon, 2001 CLK 230 K Cabriolet A208
Do you have a spare key to try?
 
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Mick taylor

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I do but it’s dead. Even the red light wont flash. Been like it before this problem arose
 

AMGeed

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2014 W212 E63 Biturbo
I would take an educated guess that the EIS is failing. It can be repaired but it needs proper diagnosis first.
You need to find an indy (MB tech outside of main dealer) with STAR diagnosis system that can pinpoint the problem.

No idea of your location, but RMK in Birmingham can repair both the EIS or any key.
http://www.replacementmercedeskeys.co.uk/

Edit.This guy is a forum supporter and can probably assist. Based in London.

https://www.ecu-repair.co.uk/
 
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Mick taylor

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Mick taylor

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Ok thanks. I’ve emailed both places and will let you know what they say
 

AMGeed

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Ok thanks. I’ve emailed both places and will let you know what they say


Don't take it as gospel that the EIS is faulty before sending it away. Get it diagnosed properly first.
 
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