Just posting this for the info of others who don't already own a VCDS and/or OBDeleven device, and don't want to spend a lot of money on either of those (or a subscription). This may be common knowledge to many but I've only seen reference to it in passing, in various places around the forum. Use at your own risk. For reference, this is what I own and have used: MY2017 (registered 2016) Skoda Fabia Mk3 (PQ26 platform) SE Combi with EA211 1.2 TSI 66kW engine (CJZC). MIB2 with 5Q0035842B control unit, supporting Android Auto/Carplay and without navigation. Redmi 9 running MIUI 13, on Android 12. Generic wifi ELM327 dongle*, purchased in 2016 from eBay for £6.50. Car Scanner ELM OBD app, which is free to use with adverts and some limits to parameter monitoring and coding. Costs £4.99 (Android) or £7.99 (iOS) for the lifetime 'pro' version with no ads or limits. *My unbranded wifi dongle is not recommended by the developer of the app, as apparently many dodgy clones and spoof devices have popped up over the years which may not work properly at best, and may cause costly software corruption issues at worst. I've clearly got lucky here. The branded Bluetooth models they suggest start from about £25 on eBay or £30 on Amazon. https://www.carscanner.info/choosing-obdii-adapter/ So apart from the basics - reading and clearing fault OBD codes for diagnostic purposes, for which I've also used it on my 2011 BMW E92 3 Series - it turns out this app can be used to do some coding on the Fabia. The capability list for PQ26 platforms is here: https://www.carscanner.info/coding-pq26/ I have no particular intention of customising the car, however the reason for the post and what I have successfully used it for, is properly registering a new battery to the car, and removing the unclearable 1555 software version management fault code left behind after updating the MIB2. The latter doesn't even require messing about with reading and calculating HEX codes, like other methods. It just does the calculation for you and applies it automatically. Fault code gone, no bother. It's obviously nowhere near as polished as OBDeleven, or as fully-featured and well supported as VCDS, but as a novice I'm chuffed with what I've been able to do with it for a fiver. Highly recommended for the cheapskates among us. 🤣