Auto Express's reliability ratings are based on our Driver Power survey of over 30,000 car owners. Ratings are the average for all owners of this car who responded. Individual owners’ ratings and comments appear below.
57-reg Petrol, Owner for 1 to 3 years

This is my second A class, I went for an automatic this time because of a small hip problem.
The first A150 which I had for just over two years was fault free, that is why I chose another one. Unfortunately it suffered from intermittent engine management / ignition / running problems, which after 2-3 breakdown finally was sorted by the Dealer, but it took three visits to finally sort it!

Reliability: 3/5 Build Quality: 5/5
04-reg Diesel, Owner for More than 5 years

not usual Mercedes quality. Only saving grace is the super cheap running costs, 50+mpg and cheap non franchise servicing. Aside from that, it's not as good as the A140 I had before this, which was better built, but really unreliable, buying diesel solved the reliability, but the 2nd generation A classes such as mine were built on a cheaper budget, and it really shows.

Reliability: 3/5 Build Quality: 2/5
2004-reg Petrol, Owner for 1 to 3 years

Auto gearbox control failed within a month at low mileage (11268) replaced by merc under warranty/goodwill.dash lights come on and go off at will - with no problems occuring - puzzling though. Does great mpg for way it's driven. drive hard it goes down to around 25 mpg on average and with a good 3 hour motorway stint it has gone to over 40mpg.

Reliability: 4/5 Build Quality: 5/5
2007-reg Diesel, Owner for more than 5 years

I have never had any form of breakdown at any time or anywhere. however my offside folding mirror failed to fold out of warranty and I paid to have the mirror fixed. Going by fuel use estimates and reliability this a class car is an excellent example of mercedes reliability, cost of running and good value f.

Reliability: 5/5 Build Quality: 5/5
07-reg Diesel, Owner for 1 to 3 years

This car is superbly made, very reliable and very well equipped - especially when my I see my A180 diesel 5 door hatch costs thousands less than a Focus. Also, the car has as much cabin space as a Passat in a vehicle that is shorter than a Golf. The A Class will be a hard act to follow.

Reliability: 5/5 Build Quality: 5/5
06-reg Diesel, Owner for 1 to 3 years

The car has been reliable over the time I have owned it, apart from a wheel bearing failure and a split windscreen washer container, both expired just 2 months outside the warranty, the Mercedesdealer did want to know even though it had been serviced by this dealer.

Reliability: 4/5 Build Quality: 4/5
2006-reg Petrol, Owner for more than 5 years

No problem apart from a tyre blow out recently (originaly fitted tyre (continetal), just 5 years old. Average, but tyre wear high (16k miles), I used to get atleast 25k on my previous vehicles (almost 34k on the michelins in my previous grand scenic).

Reliability: 4/5 Build Quality: 4/5
W-reg Petrol, Owner for 1 to 3 years

because it is a mercedes I expected a lot more although it is a second hand car,there has been a lot more faults than I imagined.And the cost of the parts is very high,had I known this before I bought it I would of gone for another model .

Reliability: 2/5 Build Quality: 3/5
2007-reg Petrol, Owner for more than 5 years

Problems with the steering. steering rack replaced under warranty! still problems outstanding. now electric power steering unit needs replacing ł500. Expensive on fuel, road tax, and servicing.

Reliability: 2/5 Build Quality: 2/5
55-reg Petrol, Owner for 3 to 5 years

good driving position. smooth automatic. roomy considering the
overall size which is rated small. ideal for taking my dog in the very rear compartment. Excellent in the snow.

Reliability: 5/5 Build Quality: 5/5
2003-reg Petrol, Owner for 3 to 5 years

It's generally good but their was an electrical failure that cannot be fixed meaning the central locking has to be operated manually

Reliability: 3/5 Build Quality: 4/5
2008-reg Diesel, Owner for 3 to 5 years

Never let me down, it has had a moment, but whatever it has always got me home. The parts can be a bit on the pricey side.

Reliability: 5/5 Build Quality: 5/5
2011-reg Diesel, Owner for 1 to 3 years

Very reliable. For the size and weight of the car I think fuel consumption is goodi average 45 to the gallon.

Reliability: 5/5 Build Quality: 5/5
2011-reg Petrol, Owner for 1 to 3 years

Incredibly reliable and trustworthy. Reasonable to fill the car up. if you forget about the cost of petrol.

Reliability: 5/5 Build Quality: 5/5
2007-reg Diesel, Owner for less than a year

Just nothing has gone wrong. At the moment-just petrol the end of the year we shall see- mot, service etc.

Reliability: 5/5 Build Quality: 5/5
1999-reg Petrol, Owner for 1 to 3 years

Very reliable, always starts first or occasionally second attempt. Car is thirstier than I would like.

Reliability: 5/5 Build Quality: 4/5
02-reg Petrol, Owner for More than 5 years

overall a good car but too many faults means the build quality is NOT up to Japanese standards

Reliability: 3/5 Build Quality: 2/5
2002-reg Petrol, Owner for 1 to 3 years

No problems/ break downs. Fairly good on petrol = only one small problem since owning car.

Reliability: 4/5 Build Quality: 4/5
56-reg Petrol, Owner for 3 to 5 years

All we hoped for. Built to last, it seems possible that it will last as long as we drive.

Reliability: 5/5 Build Quality: 5/5
55-reg Diesel, Owner for 3 to 5 years

Excellent and practical small car with punchy performance and outstanding build quality

Reliability: 4/5 Build Quality: 5/5
53-reg Diesel, Owner for More than 5 years

Just love it, still feels like a new car great build quality you get what you pay fpr.

Reliability: 5/5 Build Quality: 5/5
2010-reg Petrol, Owner for 1 to 3 years

No problems since bought new. Normal ,good insurance price and fuel consumption.

Reliability: 5/5 Build Quality: 4/5
2008-reg Petrol, Owner for 3 to 5 years

One or two small electronic niggles. Seems ok. better than my previous a-class.

Reliability: 4/5 Build Quality: 5/5
2010-reg Petrol, Owner for 1 to 3 years

Not a single problem. The only cost I find excessive is the servicing charges.

Reliability: 5/5 Build Quality: 5/5
58-reg Diesel, Owner for Less than a year

This is my 4th A Class, and they just get better. I even like the styling.

Reliability: 5/5 Build Quality: 5/5
2002-reg Petrol, Owner for less than a year

Have not had any problems or breakdowns. Seem to be as expected/ average.

Reliability: 4/5 Build Quality: 4/5
2006-reg Diesel, Owner for 1 to 3 years

4 returns to main dealer under warrenty. Little thirsty, heavy on tyres.

Reliability: 3/5 Build Quality: 5/5
58-reg Diesel, Owner for 1 to 3 years

Brilliant when you take the car in and nothing is a problem up to now

Reliability: 5/5 Build Quality: 5/5
55-reg Diesel, Owner for 1 to 3 years

Probably the best built small car for a small family you can buy.

Reliability: 4/5 Build Quality: 5/5
52-reg Diesel, Owner for More than 5 years

The car is great, but the I'm disapointed with the paintwork.

Reliability: 4/5 Build Quality: 3/5
2011-reg Diesel, Owner for less than a year

No problems. Only day to day running costs between services.

Reliability: 5/5 Build Quality: 5/5
2012-reg Petrol, Owner for less than a year

No problems as yet. Better mpg than I expected from an auto.

Reliability: 5/5 Build Quality: 5/5
2007-reg Petrol, Owner for less than a year

Can't find amore reliable one this our 3 one. Very good.

Reliability: 5/5 Build Quality: 5/5
02-reg Petrol, Owner for More than 5 years

Great small car but build quality is not up to scratch

Reliability: 4/5 Build Quality: 3/5
2001-reg Petrol, Owner for more than 5 years

Good engine.dodgey auto select. Merc parts too dear.

Reliability: 4/5 Build Quality: 3/5
-reg Petrol, Owner for 3 to 5 years

reasonable choice for a city run around

Reliability: 4/5 Build Quality: 3/5
2012-reg Petrol, Owner for less than a year

So far very reliable. Affordable.

Reliability: 5/5 Build Quality: 5/5
07-reg Petrol, Owner for 1 to 3 years

Satisfied in all respects.

Reliability: 5/5 Build Quality: 5/5
2006-reg Diesel, Owner for 1 to 3 years

I have never been let down

Reliability: 5/5 Build Quality: 4/5
2005-reg Petrol, Owner for more than 5 years

Doesn't break down

Reliability: 5/5 Build Quality: 4/5
2005-reg Petrol, Owner for 3 to 5 years

No problems

Reliability: 4/5 Build Quality: 4/5