P0006 Code.. How to reset service light indicator Mercedes Vito. From year: 2002. Turn the key to position 2in the steering lock and immediately press the KM button twice briefly. Within 10 seconds, turn the key back to position 0 in the steering lock. ... and P0252 says "injection pump fuel". it's a mercedes vito dualiner 113 - year 2012 .... P0252 Mercedes-benz T Class; P0252 Mercedes-benz 770; P0252 Engine Trouble Code. When your car's ' P0252 Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. But in many.