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I have a 03 SLK 320 which displays start error each time i try to start it, i have already tried a new key and changed batteries in both. i have been told it may be the AAM part # 170-820-18-26 i think? where is this part located?
 

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I have a 03 SLK 320 which displays start error each time i try to start it, i have already tried a new key and changed batteries in both. i have been told it may be the AAM part # 170-820-18-26 i think? where is this part located?

is this the k40/ECU relay?
 

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Most likely it is the K40/ECU relay and its located in the engine compartment on the passenger side, it has a few fuses and a one big 40 amp fuse.
 
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