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Very late reply because it slipped from my mind at the time: ultimately it was the throttle valve that needed some cleaning. The problem is mentioned at https://www.evilution.co.uk/707, but I didn't need to be so thorough and remove the cover and clean the cogs, cleaning the valve itself was more than enough, as mentioned also all around on the ForFour.co.uk ...


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Yes, possible but not a good idea. Yes you could power up the OnBoard Diagnostics device, but unless there is power in the engine control computer you won’t be able to communicate with the data bus system. Without data from the engine computer you wont be able to see any inputs or read stored codes. Now you could cut the power lead wire in the OBD II harness ...


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