Skoda Roomster Diesel Engine Problems

Oh man, that sounds frustrating! I had similar engine issues with my old Renault Megane, but it was the mass air flow sensor. The car was running rough. If the intake air temperature sensor is faulty, the engine's computer (ECU) won't get the right readings. This sensor measures the temperature of the air entering your engine. A defective sensor can cause all sorts of problems, like the ones you’re describing. Have you tried checking the sensor's wiring for any damage or loose connections?

Thanks for the quick reply! That's interesting. So, if the ECU doesn't get the right temperature, how exactly does that cause the reduced power and rough running? Is it just injecting too much or too little fuel, or is there more to it?

Yep, that's most likely the culprit. The engine uses the temperature sensor for fuel calculation. When the intake air sensor is defective the engine does not get the right amount of fuel. I would take it to a mechanic to get a second opinion. Replacing the sensor is usually a pretty quick job, but it's best to get it diagnosed properly. I'm pretty sure replacing the sensor is the way to go.

Thanks so much for the help and sharing your experience! I took it to a workshop, and you were spot on. It was the intake air temperature sensor. New sensor fitted, and the error is gone. Cost me 155€, all in. Now it runs like new again!