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Thanks for updating with the successful result.....very useful for anyone else suffering with this type of fault

Going back a few years when I was in business we were upgrading the Baggage System at T4 Heathrow. Prior to contract one of the BAA engineering team announced that Noise for the system would have to have a noise level of 60DB measured 1m from the drive unit. At midday (a quiet time for airports) ambient noise in the terminal was 89 DB outside the terminal with the M25 1mile away we measured 96 DB, we tried at 3am with everything shut down except the terminal air handling we measured 54 DB. I asked the BAA team were they measuring ambient noise + or did they seriously expect a piece of mechanical equipment to generate 6 DB? The real issue was until that point they had no Base Line, worse at that time Heathrow had 4 Terminals due to age and construction every building gave different readings even turning off fluorescent lights changed levels. Yet as we stood in the terminal at 3am to the human ear it was Cathedral like. My point is when in our car it isn't just noise but vibration that we hear/feel, our ears would hardly notice 3 or 4 DB (well mine won't to many years listening to Pink Floyd 😂) I hope Graham can find a solution but I fear unless he get's used to it it won't be with his X1 Dave

!!! SOLVED !!! SOLVED !!! SOLVED !!! so today I discovered the whole reason behind why my car wouldn't start the wiring loom for the turbo actuator and the MAF sensor had managed to work its way loose from the secure tabs that hold the wiring loom in place and got burnt by the hot part of the EGR valve causing a short circuit to ground (ground being the engine itself) so as a temporary fix I have separated the loom that has exposed wire and wrapped it up in electrical tape (I’ve cable tied the loom so is not going anywhere) also I installed the new DDE Relay which wasn't the issue as once I complete the install it didnt start so I checked the fuses in the DDE Compartment again and somehow I've managed to miss a blown 20amp fuse lol so I replaced that and Voilá its back to life so for anyone else reading this if you ever run into these main fault codes (all at the same time) 004320 DDE: Delivery control valve, activation 004350 DDE: Rail pressure control valve, activation 004191 DDE: Charging/boost pressure actuator, activation 00483D DDE: Throttle actuator 003EC0 Camshaft sensor circuit, no signal check your fuses in your DDE Compartment under the bonnet and check hotspots on engine if you can because it could be something as simple as my problem was… I had a company tell me the timing chain had failed just because they seen code 003EC0 Camshaft sensor circuit, no signal telling me I needed a engine rebuild and all sorts of rubbish (I had the timing chain replaced December last year) BIG MASSIVE THANK YOU TO GREY DOG for guiding me through it and taking the time to help me I really appreciate you mate IMG_4484.MP4 FullSizeRender.mov

My 3 series pick up road noise too. Turn the radio up! Otherwise, try some research: https://www.google.com/search?client=firefox-b-d&q=best+tyres+for+bmw+X1+