Skip the auto shop - Our mechanics make house calls

Q: ASR light on dashboard and car runs slow - 1992 Mercedes Benz 500 SEL

asked by on

My older model car is in mint condition and everything is working well except that two to three months ago the ASR light (Automatic Slip Regulator, aka-traction control) started appearing on the dashboard. I turned the car off, restarted it and everything worked normally, but after having used the brakes a few times the ASR blinked on again and the car slowed down a lot. It only moves at amount 10% of its power. Three weeks ago the ASR light started being continually on, no matter what I tried. I replaced the gas pedal with a refurbished one and it is still rough. I also checked the gas pedal cables, checked the wheel sensors, and ran a computer scan almost every day for the past month. Now, the cruise control is not working. A technician suggested that I replace the whole wiring system in the car, but that is a major job. What do you suggest I should do first and then after that?

A: You may want to get a second opinion before...

You may want to get a second opinion before replacing the entire harness. You could start by first checking and cleaning the mass air flow sensor of any dirt and oils. The sensor will cause the loss of power and ASR activation. Make sure there is no leaks in the hoses from the mass air sensor and the throttle body. If you still have problems, then contact a Mercedes mechanic to diagnose the warning light for further repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: Could the Traction Control System (TCS) lock your wheels?

Hi there. Your vehicle is designed to haul lots of weight and a trailer behind it. The noise could be from the traction control system (TCS) activating when in a turn. If a wheel speed sensor is not functioning correctly,...

Q: Mushy brakes in 2000 Ford Taurus

If the brakes feel mushy after sitting for a long period then you may have some moisture or air in the brake system. You should have the brake pads checked and serviced as needed if they are worn. You may...

Q: Oil pan removal / replacement

The oil pan in your E300 is a two part oil pan and you are looking at the lower pan part. If this is the part that is damaged then you can get it out by disconnecting the motor mounts...

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.