Expert answer

Hi Heino,

Check for vibration from the dual-mass flywheel on the 2.0-litre engines, and that the drain at the bottom of the windscreen has not become clogged with road debris and leaves. If it’s the 2.0-litre TDI and it’s smoking a lot, then the turbo is probably gone or about to go, and that engine needs a cam belt change at 120,000km.

Check the rear brake discs for excessive wear or scoring marks too — the electronic handbrake can stick on and damage the disc. Check everything electrical carefully in general for a car of that age, and don’t buy without a full and complete service history.

Expert answer

Hi Conor,

We've heard of a few electronic glitches (faulty cruise control, sticky electric handbrakes), but other than that, the A6 seems to be built to the usual solid Audi standards. As always, if you're looking at a high mileage one, remember that this is a complex, expensive car so make sure it has a full service history and appears to have been cared for.

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Hi Cormac,

It will depend on the year and model you’re talking about, but if you mean the 2008 Audi A6 update, which was the first model with the TDIe engine, then it’s basically lightly tweaked for economy and emissions, but those will be nothing to write home about compared to more modern cars. The TDIe could manage 53mpg and 139g/km, but that was with the 140hp engine, so it’s a touch under-powered in the A6. You could be better off going for a more powerful 170hp version, which will have slightly higher emissions, but which will probably do better in economy terms in real-world driving - and far more satisfying to drive.

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Hi Cormac,

Interesting one this. To be frank, it was news to us. We don't have a standardised headlight test on CompleteCar.ie (perhaps we should), but a trawl of the Audi-based internet forums does indeed seem to show that many C5 owners do have doubts about the power of their lights, especially on dipped beam.

While we can't find any definitive evidence that the facelifted model is any better, it seems that there are two potential fixes to the problem. One is to replace the standard bulbs with better models - and we've seen German-made Flosser bulbs recommended. Philips also produces a line of higher-output bulbs that may be worth a look. The other issue may be the state of the headlamp lenses, and any problems there can potentially be fixed by a good clean. Cleaning kits are available from most good motor factors. Incidentally, beware an aftermarket upgrade to a HID or Xenon headlight set. If it doesn't conform exactly to the original equipment specification, then there are doubts over the legality of such units and it could potentially lead to an NCT failure.

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Hi Flamor,

We believe this means the car reckons it's time to have a service. You'll need to take it to an Audi dealer or a garage with proper diagnostic equipment to have this checked and reset.

Let us know how you get on.

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Hi Paul,

I’m tempted to say get another 520d — for the budget, they’re hard to beat. Well worth looking at an Audi A6 2.0 TDI as an alternative, though, and a Mercedes E 220d. Or a Jaguar XF if you’re feeling like a bigger change. Of course, what you could do is take that budget and spend it on a two-year-old Skoda Superb and get a fully-loaded version...

Expert answer

Hi Gillian,

With two small kids myself I completely understand your needs. Really, you're probably after something with a much bigger boot, but I assume you like the premium look and feel of the Audi. People in your situation would often upgrade to a bigger car in the same brand, say an Audi A4 or a compact SUV. I've taken a look through Carzone.ie with your budget and needs in mind and here's a list of potential replacements:

- Audi A4: way bigger inside and in the boot than your A3 and significantly more comfortable on the road. Your budget gets you a clean 2010 model saloon or Avant estate with a 2.0 TDI engine.

- Audi A6: much bigger again than the A4, but for the same money you'll get less equipment or an older model - you could afford the saloon or Avant estate though.

- BMW 3 Series: quite comparable to the Audi A4, though not as spacious inside and few Touring estate examples on the used market. Very efficient engines.

- BMW 5 Series: lovely car in same class as Audi A6, though your budget will probably mean a high mileage example. Insist on full service history.

- Honda CR-V: well made family SUV that was designed more for on-road than off-road use. Not all that common, but hugely spacious and reliable. Make sure you go for the newer model that has only just been replaced.

- Mazda6: I'm not sure if you're attached to the Audi badge, but this car is well worth a look. It's massive inside (especially the estate), good to drive, well equipped and reliable. Your budget gets you a low mileage 2011 example too.

- Skoda Superb: no kids will ever kick the back of your seat in this car such is its rear legroom! The boot is massive too and it comes with a range of different engine options. The 1.6 TDI is especially economical. You can afford a 2010-2011 saloon, though personally I prefer the Combi estate.

- Volkswagen Passat: there are a few 2011-2012 Passat saloons available for your budget and it'd be a sensible purchase in some ways. This car is still on sale now new. There aren't many estates about unless you go for the previous generation model.

- Volkswagen Tiguan: a good option, though supply is limited at you budget to 2008 versions. High driving position and spacious all-round.

If you'd like help narrowing your search further, please do come back to us. Also, with such a low annual mileage, it's worth seriously considering a petrol car if you find a well-priced one.

Expert answer

Hi Tommy,

First of all a quick list of possibilities we found on Carzone.ie that we would consider wise buys:

- Audi A4 - Good to drive and plenty about, though you'd have to look at 2005 - 2007 within your budget. Not all that spacious either.

- Audi A6 - Hugely spacious and comfortable, but again you'd have to settle for an older car with higher mileage, which could bring unexpected costs.

- BMW 3 Series - Most examples at this price are 2005-2007. Economical diesels and great to drive, but we'd worry about potential bills - and not as spacious as non-premium brands.

- BMW 5 Series - We'd be sorely tempted by this 2005-2007 model as it's such a great car. Seek out a low mileage example with a full service history and a warranty though.

- Citroen C5 - Comfy big car with decent specification and well-proven diesel engines. Not a huge number on the market, though at least you could afford a 2008 car.

- Ford Mondeo - One of the default options here. It's big, comfortable, good to drive and there are loads and loads about. Relatively cheap and easy to maintain too.

- Honda Accord - Relatively unknown here, but the 2.2-litre diesel engine is a gem and the car is very reliable and comfortable. Look for a post-2008 one to keep your tax bill down.

- Mazda6 - This is probably the car we'd put our own money on. Go for a post-2008 diesel example in a decent specification. It's spacious, well-equipped and great to drive. Reliable too.

- Toyota Avensis - Your budget might get you one of the last of the old models from 2009, though taxi drivers tend to snap these up as well. Make sure you check the history and mileage with Cartell.ie.

- Volkswagen Passat - Plenty about and it's a spacious and comfortable car, but there have been a few niggles with the electrics that'd steer us elsewhere.

There you have it. Come back to us if you'd like more help narrowing down your search.

Expert answer

Hi James,

As discussed via email:

That generation Audi A6 is in general a reliable car, but not fault-free. Some owners have had no problems, while others have been plagued. The Multitronic transmission is not renowned for being the most trouble-free, though units made pre-2006 have the most problems. Also, the gearbox's fluid should be changed at 55,000 and 115,000 kilometres (or 35,000 and 75,000 miles) so the car you're looking at should have had two changes by now. Check that it has and then look in detail at how the gearbox works. Does the 'PRNDS' indicator on the dash flash? Is there hesitation? Is it easy to get reverse?

No matter what turbodiesel car you look at you'll hear of turbo problems from some owners. Most of the time it's likely to be due to poor oil maintenance. So check the car's service history in terms of oil changes and that the oil level itself is right. They do use a bit of oil.

While you're checking out the car in detail, make sure the air conditioning can produce freezing air in just a few minutes, as these have been known to fail.

I'm probably making this sound worse than it is! I'd buy an A6 for myself - it's a good car - you just need to know what you're looking for and not get caught out by one of the few badly maintained examples out there.

Let us know how you get on.

Expert answer

Hi Daniel,

As that car is pre-2008 it is taxed according to its engine size. Following the Budget announcement (December 5, 2012), the cost of taxing that car for a year has risen from €962 to €1,034.

Hope that helps,