I assumed it was the battery in the first fob so I changed it, but it didn't make a difference. When the faulty key is inside the car, it says "key fob not detected". The second key works fine. The key fob has been sitting in a drawer for 99% of the last 3 months due to COVID lockdowns.

The battery is really easy to change, but it's not intuitive how to get the fob apart. From memory, first you separate the two halves of the fob, then you rotate the central part that has the metal emergency key inside to reveal the battery. Maybe this picture will help?

Today, when I tried to start my Q4 (July 2017 build, MY2018) the engine would not crank and the IP displayed "Key Fob Not Detected". I placed the fob inside the center console, on the bottom, as instructed by the Owner-User Manual. The engine now started normally, with no IP warning. If your 2022 Alfa Romeo Stelvio's key fob stops working, it may need a new battery. Learn how to replace it here. more
If your Stelvio has push button start/stop feature, your vehicle may not start due to weak key fob battery and a 'key not detected' alert message may be displayed in the instrument cluster. Don't worry, you can still start your vehicle, the immobilizer is controlled by a passive transponder.
#1 · Apr 30, 2017 Hi all, Needs some help here This morning i tried to unlock my 159 with my remote key, but nothing. I replaced battery - nothing. Tried 2nd Key - nothing. I can unlock manually and have checked the relevant fuse on the panel - (to the lower right of the steering wheel).
If your 2022 Alfa Romeo Giulia's key fob stops working, it may need a new battery. Learn how to replace it here.Learn more: Sub
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#2 · Feb 25, 2018 Did you swap the immobiliser chip as well as the blade and PCB? It's a small irregular-looking bit of bit featureless plastic, a few mm long, tucked into a small compartment within the fob. It could easily be mistaken for something that had broken off the fob.
The most common cause of key fob not working in Alfa Romeo Giulia is dead battery. But the remote key can also stop working due to worn buttons, poor battery contact, water damage, defective key fob, receiver module issues, signal interference, dead 12 volt battery, and unpaired key requiring reprogramming. 1.
Key Fob Not Detected this morning. both key fobs not detected and when I tried to just lock and unlock doors I got the corner lights to flash but that's it. didn't have time to try putting fob in the special center console spot because I had an appointment to get to but that's next. .