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Where did you get the ODB II reader from? Is it universal or one for Mercedes?
 

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Obd Ii

Yes, I think it is universal on the newer models. I recently had a check engine light on my SLK230, went to Advance Auto, and they downloaded my code for free. It was the No. 1 O2 sensor. They ordered the part and and provided the special socket, took all of 20 minutes to change. They did have to download and erase the code after the sensor was changed. They aren't allowed to erase codes, but let me push the button. Most of the chain auto parts stores will download your codes for free.
 
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