Tidgy

Don't buy any upgrade parts from ebay unless you are getting know brands or from a proper known specialist who just uses it for an online shop. Especially critical components like the oil pump, you get what you pay for.

Did you swap the ecu? The imobiliser used to be linked with the ecu and the keys on the older models. so if the ecu was swapped the keys wont work the immobiliser. Could it be something like that?

tbh ive seen walbro look different even with different brands that are just rebrands lol but it does look like the codes match this one, https://www.glencoeltd.co.uk/ti-automotive-fuel-pumps-walbro/ti-automotive-walbro-255-lph-in-tank-motorsport-fuel-pumps/ boost gauge will go negative at idle, have you changed the engine bay fuel filter? Whats rpm is it trying to idle at? tbh sounds like you need to get it to a specialist and see what they can find.

XV has bluetooth connectivity as the wife plays spotify through it. from what i understand apply p[lay wasnt added till 2017/2018, but might be worth trying it and see if it will as im sure ive seen it mentioned people just connecting their phone and playing through the system. Initialy id just try to connect it and see what it does

The alarm system and immobiliser are two different systems and it sounds like you have an immobiliser fault. It's not unheard of for keys to unpair from the system due to age, but if both keys worked and now they dont i would lean toward the immobiliser rather than the keys as id be surprised if two depaired at the same time. Something to note, after 30 seconds of unlocking the car the immobiliser kicks in if you havnt started it. you need to turn the ignition on, then press the unlock button again to turn it off again. you may know that already but i thought better to mention it just in case you didnt and wasnt actualy anything wrong.

Yeah the first one just tried to scam you, unless there was some other reason they said it needs a new gearbox. Could be idle control valve or possibly battery/alternator related, sounds daft, but on our XV when the battery was really low it kept stalling when loaded up by the power steering or dropping to idle.

they where well aware of what they were doing sadly, i know of meetings that happened a years ago that they just ignore what they were told. Lets just say subaru UK themselves could have had a p25 years ago if they just said yes.

Welcome to sods law. It knew, i'm telling you it knew!!!!! lol At least no big bill for now I'd keep an eye on your oil level by checking it regularly just in case the sensor is on the way out and that nothing funky is going on

Sad thing is it really shows how bad subaru UK is/was when info like this shows up.

So done some digging, apparently they are like rocking horse poo now and in reality do very little so just tend to be removed and just bypassed.

dam, that's a tad concerning. I'll have to do some digging.

Could be its not getting charged correctly or there could be a drain, do you have anywhere that offers free battery checks local? they should be able to check if the alternator is working correctly.

hot or cold can change the level a bit, but if its dipping correctly then theres obviously oil there :D where ya taking it to out of interest?

If the oil level is physically fine sounds like it may be a sensor issue, def get it to a specialist to check out whats going on.

did you ring them or just check the website?