Stevey Y

Hi never mind the battery the p2002 is going to cost some dollar to fix, get a quote first before spending any more money. Steve.

Hi try reading the MAF and MAP sensor readings on live data when cold start, I would guess it could be the MAF sensor if its the original unit as they tend to play about when they get old. Steve.

Hi try pm to Audia4KEV he may well know of an engine. Steve.

Hi think your aircon needs a degass had the same with mine and it was low refrigerant, its probably got a leak and if you look where the radiator is it might as well have a sign on it, Road Debris hit me. Steve.

Hi maybe it needs adapting again if you have VCDS there are plenty of how to do its on YouTube. Steve.

Pleeeeeeease code the new battery. Steve.

Hi I would from these figures assume the battery is well on its way anything below 85% SOC and with availability of 25AH is definitely wrong, how old is the battery? Steve.

Hi just try a gearbox reset that may well help with this, having the DPF cleaned won't affect the gearbox, normally after a gearbox service they do a reset so all the mechatronics can relearn its values. Steve.

Hi the idea of publishing the codes you have is to narrow down the components that may be causing this, you say that the vehicle was laid up for two years and you have blown two HPFPs therefore I would suggest that the high pressure side is in overrun which is eminently checkable on live data, my guess is that its the fuel pressure regulator playing about, this meters the fuel pressure within the rail and is electro mechanical therefore it can stick slightly and cause insufficient fuel to the rail causing flat spots or stick wide open and the HPFP tries to keep up with what it thinks is demand, the return system just loses what it won't use, using live data check the rail pressure at idle and then through the rev range and see if the figures add up, don't know what the rail pressures should be ideally on the DETA engine you have but I know if the lift pump in the tank is high around 600lpm you have a problem further up. Steve.

Hi the engine could well have been new or classed as such under American consumer law despite being classed as refurbished in the U.K. , the other key bits of information such as milage of the original unit would affect the value of bolting well worn parts on to a new bare unit, my suspicion is someone has used a faulty/old gasket in the system or fitted parts incorrectly, this particular poster seems very reticent to provide answers to simple questions that are simple building blocks towards diagnosis, why these people come to this forum requesting help and then abuse the person trying to help is beyond me, they expect a solution with the minimum of Information and then throw their toys out of the pram when they don't get what they want to hear, he has probably run out of sites to abuse in the states, so now its our turn, lucky us. Steve.

Hi tried to watch the video but it won't play maybe a photo would be better? Steve.

Hi I would get someone else to check if the system has any gas in it, most independent garages have a decent aircon machine and will check it by seeing if it has ay gas and then pressure checking the system for leaks chances are its either run low on gas or has a hole in the radiator either way Cliff was correct when he said they can't block, therefore I would give the ZOONS at Halfords a wide birth. Steve.

Hi the newer Audis are mostly the same, not good except for possibly Q3s that use mostly VW engines and running gear, in saying that most car manufacturers are having the same cost cutting driven problems with the exception of Toyota that consistently produce good reliable vehicles, not as plush as the Audi but why pay that money for the A4/A6 with no inherent reliability. Steve.

Hate to point this out but even if you fit a new steering angle sensor you have to recode it, if it sounds like a lot of work, its not half as much work if you don't get the wiring right as well as the coding, the electronics on these vehicles has always been complex and if you fry a body control module [any one of about five] you then have a serious problem. Steve.

Hi it always says that, thats how they make money, you could try getting your garage to open the bonnet before plugging it in, if that won't work you are going to have to go the VCDS or OBDEleven route as both these have the capability to generate the challenge code to get in, Steve.

The lock is called SFD and any car post 19 that is VAG has it, most garage scanners won't touch it except if they have a newer platform software VCDS or similar OBDEleven pro which is the cheapest option, what are they trying to repair. Steve.

Hi that would do it, the remap has possibly done the damage as the pistons on these EA111 engines have a weak point insomuch as increased boost pressure and fuelling cause the ring grooves to fail and bits fall off of the castings where the rings locate which is probably why you have compression failure, having spoken to my garage they reckon timing chain tensioners can fail anywhere between 40k-60k which probably explains why in a short time they phased this engine out and bought in an upgraded belt driven engine. Steve.

Hi I think you need an auto electrician to sort this one out but I have a sneaking suspicion the comfort control modules have possibly been fried as they don't like water or being shorted to earth, my advice is tell the mechanic he has to pay for the fix. Steve.

Hi you can't just swap the airbag module as the steering wheel originally fitted is completely different, an auto electrician could probably sort the wiring but the new wheel would need coding in and thats if you don't need another control module. Steve.

Hi if its failed a sniff test its academic the gasket is leaking, I personally would do the same as the first garage if you take in to account that the head will most likely need a skim to correct any surface defects, then the valve seats would need to be lapped in, the timing chain is worth doing as even at 60k its probably stretched and the guides will be worn, factor in possible bore wear and you have the potential for a catastrophic wallet failure, from memory these engines were not good from new and if driven hard don't generally take to much action, you also mentioned improvements, one of them was not mapping was it? Steve.

Hi I doubt the brake change caused this it could well be the update or the camera mounted in the screen. Steve.

Hi might well be with doing if the pressure slows down it may well be the valve, how many miles has the car done as around that year they are famous for burning oil where they used skinny oil control rings, problem is they let oil up but also down which pressurises the sump, fingers crossed its the aftermarket valve. Steve.

Hi are you sure the new valve has a diaphragm in it the worrying thing is the amount of pressure coming out of the valve. Steve.

Head gaskets would be a whole new world of wallet pain but your description was very precise giving no indication of system pressurising, looking forward to a glowing success. Steve.

Hi I don't think you have wasted your money, find another C7 and use the codes from that as far as I am aware the coding number is an acceptance code to let the ECU know its had a new unit, the injectors are all the same and once accepted will re learn their values very quickly. Steve.