Originally Posted by Deni

Hi!

A friend of mine has a ml320 petrol. The ETS and ABS lights on the dash stay lit. I checked it with an obd2 code reader and I got p0700 (Transmission Control System Malfunction) and p0720 (Output Speed Sensor Circuit Malfunction). The ABS works, but I think it engages too early, i.e. the brake pedal starts kicking back even during a normal stop.

The car otherwise seems to be driving fine.

I read the other posts and check the battery. With the engine shut off it gives out about 12.5 volts, with the engine running it gives out about 13.5 volts.

What do you people reckon might be the issue? Where's the output speed sensor located? I know it's in the back of the transmission but a picture or diagram would help a lot.

Thanks!

Deni