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Marty
Marty, ASE Certified Technician
Category: Car
Satisfied Customers: 53904
Experience:  ASE & Bosch Certified Master Tech. Over 30 years experience.
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MBZ 420 SEL: fast idle/ABS light MBZ 1990 SEL * Replaced

This answer was rated:

fast idle/ABS light
MBZ 1990 SEL
* Replaced intake manifold gaskets
* Replaced idle air valve
* Replaced idle control unit
Still same problem
Hi Walter, when you have the high idle and the ABS light on your problem will be the overvoltage protection relay. The relay powers both the idle speed system and the ABS brake system. There are one or two fuses in the top of the relay that you need to check first. If the fuses are good go ahead and replace the relay. I've attached a picture of the relay location below. The relay is part number 201 540 37 45. Click here for a source for the relay. Let me know if you have any questions.

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Hi Walter, I'm just following up with you on the Mercedes. Did you get the relay replaced? Do you need anymore help with this?

Marty
Customer: replied 4 years ago.

Sorry don't have the replaced part yet so far your response is


excellent

Ok, thanks for getting back to me. Let me know how you make out.
Hi Walter, I'm just following up with you on the Mercedes. Were you able to check or replace the overvoltage protection relay? Do you need anymore help with this?

Marty
Customer: replied 4 years ago.

Just received the part instl'd it the car starts up good no ABS lite and


the idle is good.


You are a genius thank you and thank you, XXXXX XXXXX my day you bet


I'm happy after all those weeks I never thought it is over voltage relay


You are smart again thank you Walter