Hello, today I also have a naïve question in the round for the 2.2 l engine with 155 hp in the Tourneo: Are defective glow plugs displayed in the instrument cluster or is there an error in the engine control unit? Or can you only measure current and resistance? Background: I had the car in the friendly one because of lack of performance and poor gas acceptance at low speeds. As the only problem were some defective glow plugs determined and replaced (all 4). g an indicator (Autool) that can also read (restricted) error messages. That had not shown me anything in advance, there was no start problem either. However, I now had problems with the first frost after the repair. When looking under the hood I could not find any traces of the repair. Everything still as dusty as before. Therefore I have a strange feeling. Today I measured the candles times: tension arrives and passage they also have. So before I get upset, I’d rather ask: Do broken glow candles make a mistake or do you only come up with a measurement? In the rest of the car today, when it comes to plus degrees, it runs like a bee again. Let’s see if it gets frosty again.