Inoperative W211 ESP; refer to owner's handbook for details.

[cumblechook22]

Hello everyone

An error message reading "ESP inoperative see owner manual" and "Run flat indicator inoperative" appeared on the dashboard yesterday morning, shortly after a short distance of driving.
I tried bringing the car to a complete stop, but it wouldn't come up until I pressed the brake a couple of times. I'm still confused about what to do next.
Also tried the 'run flat tire process' with no luck; turning the ignition key from off to on worked, but it didn't fix the problem either.
Talked to my regular garage guy, and he scheduled an appointment for me to come in after four hours, giving me plenty of time.

I took it to a mechanic, and he suggested trying increasing the tyre pressure to see if it helped. I did that, but the problem persisted.
took it to a different repair shop, where the technician ran diagnostic tests and discovered errors related to the CAN bus, rear sensors, brake switch, and other systems. After he asked me to take it for a spin, he attempted to clear everything.
After a brief test drive, the ESP error reappeared. The technician double-checked everything and cleared all the codes, but the brake switch still wouldn't clear itself. I didn't understand how the switch could be the problem, even though the brake light would come on when I pressed the brake.
So, he decided to flip the switch for the brakes and watch what happened.

Despite everything, every time I press the brake, the light turns on without a hitch; it's not intermittent in the least. His inability to decipher the "brake switch" code was evident.
The brake lights are functioning properly, and according to what I could find online, the brake switch only has two wires—no additional control wires—so it's either on or off. How, then, could this be a problem with the "brake switch"?

Much obliged.

[cumblechook22]

http://shop.ebay.co.uk/?_nkw=brake+switch&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338181132&toolid=10001&customid=2518X1570512Xb77f5331ac365278918c15dbcaa7687d&subId2=15

[ByteStorm]

The dual output brake light switch, found on certain models, may partially malfunction. The brake lights will still function, but there may be additional issues like the ones you're experiencing.

Pull the plug.

[ChatMaven]

About £20 for the brake light switch

[cumblechook22]

It was undoubtedly the brake switch; nonetheless, he charged £70. Thanks everyone; the problem is now resolved.

[dave783]

Costs of materials, labour, and value-added tax!