Where is the MAP sensor located on Mercedes C230 2006?

On the 1999 model it is mounted in a bracket and sits near the big air intake hose that feeds outside air to the engine, on the right side of the engine compartment, near the bottle for the windshield washer fluid. It's black and small, about the sized of an old zippo cigarette lighter. It's right on top, easy to see and reach. It has one single bolt attaching it to the car. It has an electrical connector on it pointing toward the engine, and a small vacuum hose on the bottom running back to the front of the engine. This vacuum hose is key. It runs from the bottom of the sensor, to a little plastic Black Y connector. From that Y is joins an even smaller clear hard plastic vacuum tube that snakes to the front of the engine. There is a decorative cover on the front of the engine, you can remove that, gently, without using tools and then you can see more of the little plastic tube, running to the left front of the engine and attaching to a part there bolted on the front of the engine. This vacuum routing is the source of many/most MAP codes. If there is anything pulled loose, or cracked, or broken, or melted, that's your problem! Check it carefully on the bottom of the sensor, use a strong light and a mirror to check the bottom. Since it bends at a right angle there, it often cracks there. Before buying a new sensor, pull the hose off the bottom and see if it's cracked, you will have to pull it off anyway if you replace the sensor.

I'm sorry I don't have a 2006 model, but no one ever answered this so at least I can fill in something that is hopefully useful for people that find this via google.

Map sensor problems are more common on certain models. As far as engine computer sensor reliability this is one of the sensors that appear to be more reliable overall. But on a few models poor mounting location chosen by the factory may reduce its reliability.

You can use BMW scanner to check the problem