Problems with Renault Kadjar diesel engine: Unstable engine and poor fuel efficiency - intake air temperature sensor defective?

Hello, I drive a Renault Kadjar diesel engine (built in 2016) and once had a similar problem. But I'm not an expert, I just have a bit of experience. In my case, the evaluation electronics (engine control unit) was defective. They replaced the thing in the workshop and that was it. However, it cost me a hefty 1000 euros. Could you give us more details about your car? How many kilometers has it done, when was the last inspection, etc.? Maybe then I can help you better. I hope that helps you. Best regards!

(Translated from German)

Hey, thanks for the input! My Kadjar already has 111938 km on the clock and the last service was done recently. Could it be possible that the problem is ultimately related to mileage or service? What do you think? Thanks for your feedback! Best regards!

(Translated from German)

Hi, 111938 km is quite a lot, but it shouldn't usually be a major problem with a 2018 Kadjar. Problems with the intake air temperature sensor could actually be the cause of your problems, which can lead to incorrect mixture preparation. This can also explain the high fuel consumption. But as I said, in my case it was the engine control unit. The recent inspection should actually reveal this type of problem, unless they missed it or it occurred afterward. However, I could imagine the error message being triggered by dirty fitted parts. For example, a dirty throttle valve or a dirty mass air flow sensor could be the cause. Be that as it may, I would advise you to take the car to a workshop to have it thoroughly checked. Faults in connection with the engine control light should always be taken seriously. I hope this helps you. Stay healthy! Best regards!

(Translated from German)

Hey, I'm really grateful for your detailed answer. That sounds very plausible. I thought it was probably the intake air temperature sensor, but your points really make sense. I will definitely take note of all these points and discuss them at my next workshop visit. Hopefully the problem will be fixed then. Thanks for taking the time to help. Take care of yourself! See you then!

(Translated from German)