When it comes to problems with Audi’s they are generally one of the most reliable manufacturers in the UK car market. They have built their reputation by designing cars that are of high quality based around their engineering excellence and technological innovation. However with this reputation there is always going to be some sort of common problem/complaint or design fault that occurs.
The most common complaint with the Audi A4 Avant is that the petrol engine is just not as economically efficient as the diesel engine. On a personal note I would say that this is to be expected and as long as you are driving enough miles to justify the price tag, and the rising diesel costs then it is worth the investment. You can find all specs of the A4 Avant over the internet whether you are looking at a new, used or a Lease Audi A4 Avant. The suspension on the A4 Avant can also be a bit firm making the ride a little uncomfortable.
One spec of the A5, the 3.0 litre TDI V6 Quattro was actually recalled by Audi for an inspection or possible replacement of the fuel pipe from the filler to the tank. As well as a potential change of battery because some of them may have not been fitted with the correct battery.
With the Audi A5 Sportback 2.0 TSI spec the biggest complaint seems to revolve around the oil consumption. Now this could be down to either the loosening of the piston rings or a carbon build up on the valves. Either problem prevents the valves from seating properly resulting in engine oil seeping past the valve. This problem has been reported after 60,000 miles so if you are looking at a Used Audi A5 make sure you take this into account when negotiating a price because if it happens to yours, it could be an expensive problem to fix.
The Audi Q3 is one of a new generation of compact posh-roaders that have been built to compete alongside the BMW X1 and Land Rover Range Rover Evoque. The Q3 is a big, chunky looking SUV yet Audi have somehow managed to keep it nearly the same length of its younger sister the A3 Sportback at roughly four metres. Some of the common problems mentioned with the Q3 is the light steering at low speeds which actually then tightens up at higher speeds. A failed manual transmission on the 2.0 TFSI spec was also reported however this should be replaced under the warranty. If you are looking at a Used Audi Q3 then ask the owner whether the replacement has been completed already.
The Audi Q5 has been built to compete against the BMW X3 and the Land Rover Freelander and a smaller alternative to Audi’s own Q7. One of the biggest complaints with the Q5 is the cost of the optional extras can add tens of thousands of pounds to the original cost. So for anybody looking to buy or sell a Second Hand Audi Q5 it makes the pricing very difficult. The Q5 did achieve a Euro NCAP five-star rating so any worries regarding the safety of the model should be put to rest with this.
The Audi Q7 is an imposing car offering drivers a high driving position that provides a commanding view of the road ahead. The legroom in the last row of seats is limited, making it an unsuitable ride for anybody taller than roughly five foot six. The Q7 is now no longer built with a petrol engine so, if you are a petrol head, the only way to get your hands on one will be to find a Second Hand Audi Q7. Another common problem with the Q7 is its running costs however it is a big, powerful SUV so you cannot expect a high MPG. One final problem to mention is the large 21 inch wheels are easily damaged so expect expensive tyre changes if you get a flat.
The Audi RS3 is one of the best hatchback models money can buy. With the power of a turbocharged, 2.5 litre, five-cylinder engine and the use of Audi’s four wheel drive traction this is an extremely fun model to drive. This model is only available in the practical five-door Sportback body shape and is now only available as a used model due to it being discontinued by Audi. One obvious problem with the discontinuation of the RS3 is that some parts may have to be found via other methods other than contacting Audi. It has been said that it provides a firm ride which can be uncomfortable and it not available as a manual too.
The Audi RS4 is a step up from the RS3 and is now only available as an estate from new. The old saloon model has been discontinued to make way for the Audi RS5. This does mean that, if your preference is the saloon model, you will only be able to buy a Used Audi RS4, which has been a disappointment for the avid fans of the RS4 model. There is the Audi RS4 Avant available which is incredibly fast. Underneath the hood you will find a 4.2 litre V8, four-wheel drive providing you with 444bhp. 
There have been complaints with the interlinked dynamic ride control being too hard of a ride and therefore making a journey uncomfortable. The RS4 is prone to leaks at the seals too so keep an eye out for any damage this may have caused even if it’s just a bit of dampness because this can lower the price of your car if you ever decided to re-sell it.