Q: 2001 Mercedes S500 stuck in antitheft mode

asked by on

Locked key I trunk. While retrieving it the alarm activated. Since then alarm won't arm or disarm and car won't start. It cranks but won't turn over. Windows work by the switch but nothing else responds. Had computer reset at European car repair shop.. even changed the EIS, ECM, key and shifter. Still same symptoms.

My car has 189000 miles.
My car has an automatic transmission.

Your car will need to be scanned by the Mercedes appropriate equipment like the SDS or the Baum tool. Not all independent shops go to the expense to equip themselves with such expensive stuff so you might end up having to see a dealer. If the car is actually in lockout, that is handled by the DAS (driver authorization system) and there will be codes there that can only be read with the right stuff. But I wouldn’t rule out some other problem, like a failure in the power distribution box. these cars are very complicated and it seems they rarely have just one problem at a time. To get a hands-on opinion, you can contact Your Mechanic. They can send a technician to your home or office to check out your Mercedes and let you know what it is going to take to solve your problem.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 2001 Mercedes S500 stuck in antitheft mode

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Leaking antifreeze

The leaking coolant sounds like it is coming from the water pump in the front of the motor. With this much coolant leaking I would recommend not driving the vehicle until it is fixed. This engine is very prone to...

Q: Brake Warning Lamp still on

Typically a warning light needs to be cleared by a digital scanner completed by a professional mechanic if a repair has been made. Based on what you said our mechanic completed; there were no repairs. The brake light issue could...

Q: getting no channels radio

I have never heard of a specific station being blocked on a radio. It is possible that the signal on the weather station is an analog station and the radio will only play digital signals or vice versa. I would...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.