C230 kompressor

What did they do to fix it the last time?

Mine suffers from the engine light coming on. It used to come on and then go off before I got to the workshop to have it looked at. Then one day it was on when I was driving past so i went straight in and they diagnosed a faulty oxygene sensor. No charge to replace it as it was under warranty. However, I still get it happening. Especially if I accellerate hard while turning right (like at a junction) It makes me think its supercharger related but the system is not storing the fault information. Its no big deal but very annoying. They have assured me there is no problem with the engine that they can find but its going to be investigated. My hunch is its wiring related somehow as the car still sounds fine and behaves normally.

Overfilling the fuel tank (adding one or more tries to get a little more fuel into the tank after the first automatic click/shutoff) causes liquid fuel to back up into the emissions tube on the fuel filler neck. The liquid fuel saturates a relatively large amount of activated charcoal in a cannister under the car, and it is unable to temporarily store fuel tank vapors. The self-checking emissions controller sees a malfunction at the fuel tank, and the Check Engine light comes on. The engine suddenly runs rough, barely idling, shaking violently, and then resolves itself in about

Once doused with gasoline, the activated charcoal in the cannister is hardened, less absorbent and less able to temporarily hold fuel vapors. Repeated dousings from overfilling the fuel tank is a great way to get another charcoal cannister before you would have otherwise needed one.

Thanks for that, but its not whats causing it in my car Thinking abou it it happens mainly when the engine is hot and there is not much fuel left in the tank, although that might just be coincidence.