Interior sensor faults

cyhliu

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I've just serviced my S3 at an Audi dealership and I was dreading the list of issues they would find, however they only recommended that I keep an eye on my rear tyres as they are getting close to the legal limit.

They did however find a number of faults with the interior sensors, namely the interior motion, the horn and the anti-tilt/theft sensor.

I had a quick look here to see how I could test this, the horn, pretty self-explanatory, that works but the interior sensor is apparently faulty (parked up, locked it from inside, waited a minute or so and they started to wave my arms in the air, like I just don't care!). Anyone on here had a similar fault raised before? And if so, any suggestions how to fix them?

I thought it could be the fuse, but haven't checked yet, failing that then the sensor could be faulty. Anything else? Thanks.