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How do I read code for check engine light

(1995 Mercedes-Benz E320)
in Loomis, CA on August 06, 2014
When I push down and hold the button in the small box under the hood it does not blink, what should I try next to read code.
Displaying 1 answers & 1 comments
Popular Answer
of Greg's Orange Auto on August 07, 2014
have it scanned with a prof scanner
on August 10, 2014
Thank you for your response ,also when I'm holding down the button should the car be running or not.
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