Stevey Y

Hi its the sealing ring, most likely they did not change it with the unit problem being that you have to buy the seal separately and they are quite expensive, its either the seal or they have damaged the locking ring that holds the pump in when they re tightened it, the third hole looks like a breather, easiest way to check is get a small length of wire and push it into the hole and see if it bottoms out, if it does its the seal. Steve.

Hi I would definitely get some body in that line of work to look at it and tell you realtime what's been done, never been a fan of mapping as half the clowns out there have no idea what they are doing or what the long term implications of their work is, are you still getting codes? Steve.

Hi it is most likely the camera under the windscreen failing they are very sensitive to heat/cold and living with it verses the cost of replacement is a no brainer. Steve.

Hi could be the delete and remap are causing the problem all airflow and exhaust flows are monitored against each other if the exhaust gas is escaping to fast the the o2 sensor can't read it properly, thinking behind this is all DPF deletes involve physical removal of some or all of the DPF core. Steve.

Hi which brand of brake fluid was used when it was changed I have found that you can't just use any DOT4 as this caused quite a few component failures on my car until I settled on Comma ESP4 this is as close as you get to OE without the price tag, even the garage I use has started using what they call the expensive stuff as 2ltres is about the same as what they would have paid for a gallon of the trade stuff, all brake fluid is hydroscopic, [absorbs water] but having done some research it seems the cheaper fluids absorb water faster and the majority of modern car breaking systems rely on fluid viscosity, worth a try?. PS you can't cause damage over filling a brake reservoir. Steve.

Hi Natasha and welcome, this forum has a lot of info on Q7 ownership and its pitfalls as well as solutions to those pitfalls. Steve.

Hi Rob, yes its the cover thats behind the mirror if you pull it off its under there its attached to the screen by some sort of metal spring holder it also acts as a humidity sensor for the climate control the other problem sensor is the fresh air one which hangs inside the air intake box under the front scuttle where the window wiper is front left as you sit in car, I just used to clean that in alcohol and it would start working again. Steve.

Hi Rob I had the same issue with my A6 when I first got it it turned out to be the sensor under the cowling under the mirror, apparently its a common problem, its a bit of a faff to get to but doable its just a plastic disc with wires. Steve.

Hi Steve that looks the better option, ask for a comprehensive list of what's been refurbished, yes its a lot more money but it will at least give you a solid platform to build on. Steve.

Hi either the oil pressure switch or the bulb in the dash pod otherwise it would seize up in short order. Steve.

Hi Andy unfortunately not, Audi have all the codes for every model from 2011 up and wont supply that information to any outside key suppliers, its not like the old days when you got a dummy key and just coded the new transducer in that key via the ignition. Steve.

Hi the horizontal lines I would say are honing marks [normal] the vertical marks are not and a sign of oil starvation or cracked piston rings. Steve.

Hi thats not the service position thats the motor knackered, they don't have a service position, this is a well known problem as its a bad design a percentage of water gets past the spindle seal and terminates the motor. Steve.

Hi Steve, I personally would not go anywhere near that one it looks like cheap trouble until you get the bill for the rebuild, go for a later engine thats got some history and runs, not some vague statement that it did and then spent an indeterminate time in storage, no milage, I think he wants to go to the pub on someones £80, I have made the same mistake in the past especially when driven by desperation, take your time send your cash wisely and make sure what goes in at least works. Steve

Hi Steve your mechanic is correct, due to Audis practise of using the same engine but putting different emissions gear on them and giving the engine a different designation you are almost certain to be successful as the basic block will be the same as will the heads, if you look at the engines for my A6 CNHA most of the parts were common to the DETA,DDDA,same engine different horsepower which is controlled by the ECU, ergo unless the engine has a mind of its own it will wait for the ECU to tell it what to do. Steve.