Skip the auto shop - Our mechanics make house calls

Q: esp bas light on dash keeps coming on

asked by on

the bas/esp light on my 1999 sl500 was coming on intermitantly.Then going about 15 miles an hour one day my brakes locked op and the triangle in the center console flashed I replaced the brake light switch ,turned the stop to stop it went out. but when i start to drive it they comes back on.no fault codes but a possible output shaft speed sensor. I shook both front wheels and the passenger side has some play,could that cause this?
My car has an automatic transmission.

There is a TSB (technical service bulletin) for this issue. It does say the brake switch is the source of the problem. At least it can be the source of the fix. But it doesn’t say replace the switch. Apparently there is too much travel in the brake switch and the distance the switch travels is compared to other vehicle parameters involve with stability control. The TSB outlines a procedure to add a spacer to the brake switch.

There are four separate TSB’s on the stability control for your car. Each has corresponding codes. The one I mentioned above is the only one that states the esp and bas lights are illuminated. The others only light up the esp light. If this is the case, they are outlining problems with the steering angle sensor.

Either way, this is a highly technical system and I recommend booking an appointment with a qualified technician. I recommend the following inspection to help you out; Taction control light is on which can be performed at your home or office. This inspection isn’t titled exactly your problem, but the skill set for you repair is the same.

Good luck!

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: My vehicle has electrical issues after replacing the wiper motor.

Hi there. There is a parasitic draw that is making your battery go dead. First, charge up the battery to the maximum voltage that it will go to, ie: 12.4 volts to 12.6 volts. Anything under 12.4 volts, then the...

Q: I need the glass for the third stop light only.

All you have to do is go to a search on the internet and put in 2003 mercedes sl500 third brake light and you will have tons of options to purchase the lens or the complete light and also get...

Q: ABS actuator to be replaced 2nd time in a year

Hello. There is no other permanent fix for this other than replacing it with a factory unit. Once it is replaced the connections and the grounds need to be checked. Also all of the wheel speed sensor signals need to...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...