clydemarshall

Hi There, new to mbworld.

I have a 2000 W202 C240 sport. For over a year now the BAS and ABS lights have been showing. I don't drive the car much so kinda ignored it. Recently the car went into limp mode with the brake light and engine light showing. First my nearest Mercedes franchise changed all my disk pads. That never helped. They then changed the brake light switch even though and that never worked. The thing that is confusing is the car does not show the brake and engine light (limp mode) when cold in the morning and only later when it gets warmer. The Mercedes mechanic suggested there is a communication failure between the computer box and brake light switch because the diagnostic report still shows the brake light switch to be faulty. They want to charge me for 7 hours of investigative work. This makes no sense to me because my lights are working and it works in the morning. Please could you assist in what the problem could be? Also, replaced brake sensors with pads.

Russell Ormerod

Check the actual values for NC and. NO contact of brake switch.
There is no such thing as communication to your brake switch. It's a simple on off switch. 7 hours means they clueless

clydemarshall

Hi Russel

Thanks a mil. What is NC?

Russell Ormerod

The switch has 2 contacts . NO- Normally Open and NC-Normally Closed.
On actual values they should swop over as u press and release brake pedal
If not take a look at all the fuses. Also make sure switch is fitted and adjusted.

clydemarshall

Thanks to all that replied. I done all you said and guess what, it was a loose connection in the computer box. Mercedes would have charged me an arm and a leg for this.

Russell Ormerod

Where exactly was it loose?

clydemarshall

Hi Russel. One of the wiring harness connectors was loose.

Russell Ormerod

Ok. Good find.well done