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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53901
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: 11 months ago.
Category: Mercedes
Expert:  Marty replied 11 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.