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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53682
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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Can't turn off alarm, Yes but when I start engine it fails

Customer Question

Can't turn off alarm
JA: Have you tried locking and unlocking the driver's side door using the key itself?
Customer: Yes but when I start engine it fails to start after several tries it starts but u can hear alarm faintly for a few seconds
JA: What is the model/year of your Mercedes?
Customer: 89 300e with 89,000 miles
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Cold start valve fuel regulator .I am trying to fix myself
JA: Anything else you think the mechanic should know?
Customer: Needs muffler,replaced battery an alternator.Took to shop he said change relay changed that slso.Car takes a long time to start .Also fuel pump changed.
Submitted: 8 months ago.
Category: Mercedes
Expert:  Marty replied 8 months ago.

Hi, start by replacing all of the fuses in the fuse box and replace the overvoltage protection relay located behind the battery. Poor fuse connections and a bad overvoltage protection relay can cause starting problems.