Nobody wants to fall in love with their next used car, only to realise that it is completely unreliable and is going to try and empty their bank account with endless unexpected faults and breakdowns!
So we have revealed the top 10 least reliable used car makes and models, so you will be in the know when it comes to shelling out your hard-earned cash on a less than trustworthy vehicle.
Our expert data analysts at have created their latest Reliability Index using their extended warranty data – which takes into consideration several factors, including frequency of repairs and repair costs – to give each vehicle an overall score out of 100.
Here are our top 10 least reliable used car makes
We have listed the top 10 least reliable used car makes below and it is interesting to see that the list is dominated by expensive, high-end vehicles and supercars, with Italian manufacturer, Ferrari, taking first position as the least reliable car make.
Ferrari scored a paltry 13.84 out of 100 in the Reliability Index, but with an average repair cost of £4,913.46 and the highest number of repairs of any of cars in the index – it is no surprise that this car is deemed the least reliable! Particularly when you consider the manufacturer at the other end of the scale is Honda, which we have been crowned the most reliable car make, with an average repair cost of £538.59!
Coming in 2nd and 3rd positions are British manufacturers McLaren and Rolls Royce, again with a high number of repairs required and some of the highest average repair costs in the entire Reliability Index at £4,165.56 and £2,771.53, respectively. Moving down the list, it is clear that British manufacturers are the most heavily featured, with appearances from Italian, Japanese and American manufacturers along the way. However, last place goes to American manufacturer, Tesla, which has clearly not built its reputation on reliability, with 39% of Tesla’s experiencing a fault with an average repair bill of £1,289.94!
| Pos. | Make | Avg. Mileage | Avg. Repair Cost | Overall Score /100 |
| 1 | Ferrari | 19068 | £4,913.46 | 13.84 |
| 2 | McLaren | 18195 | £4,165.56 | 15.12 |
| 3 | Rolls Royce | 37569 | £2,771.53 | 26.00 |
| 4 | Bentley | 26375 | £2,260.07 | 26.64 |
| 5 | Lamborghini | 11966 | £2,709.40 | 30.84 |
| 6 | Subaru | 63899 | £1,862.88 | 31.83 |
| 7 | Chrysler | 61697 | £1,780.74 | 35.96 |
| 8 | Maserati | 28541 | £1,635.21 | 44.99 |
| 9 | Land Rover | 55463 | £1,268.96 | 45.27 |
| 10 | Tesla | 50917 | £1,289.94 | 45.56 |
Apparently, owning high-end, luxurious cars is not just expensive at the point of purchase – there is also plenty of money to be spent if they experience faults.
1. Bentley Continental GT
The Bentley Continental GT is the least reliable used car model according to the Warrantywise Reliability Index. The most common faults with this car relate to the fuel system, electrics and engine, with one of the most expensive Warrantywise repairs on this model costing over £10,000 for an electrical issue!
The average warranty cost for this model is around £96.87 per month*.
Get a quick quote today and see how much you could save!
2. Audi A7
The Audi A7 is the model taking 2nd place in the top 10 least reliable models. According to Warrantywise repair data, the most common issues with this model are relating to the gearbox, electrics and wheel bearings.
The average warranty cost for this model is around £81.08 per month*.
Get a quick quote today and see how much you could save!
3. BMW X6
The BMW X6 makes the top 3, with over 50% of the models covered by Warrantywise requiring a repair, with an average repair cost of almost £2,000!
The average warranty cost for this model is around £61.43 per month*.
Get a quick quote today and see how much you could save!
4. Porsche Cayenne
In 4th place is the Porsche Cayenne, with a lower number of repairs than the top 3. According to Warrantywise repair data, the main issues with this model are relating to the engine, gearbox and electrics.
The average warranty cost for this model is around £71.75 per month*.
Get a quick quote today and see how much you could save!
5. Chevrolet Captiva
The Chevrolet Captiva comes in halfway through the least reliable list with a slightly higher number of repairs than the Porsche Cayenne, but a lower average repair cost.
The average warranty cost for this model is around £47.10 per month*.
Get a quick quote today and see how much you could save!
6. Land Rover Range Rover Sport
In 6th place is the Land Rover Range Rover Sport. Warrantywise repair data for Land Rover car warranties indicates the most common issues with this model are relating to the suspension, electrics and brakes, with one of the most expensive repairs costing over £20,000!
7. Jaguar XJ
The Jaguar XJ is slightly more reliable than the Range Rover Sport with a lower number of repairs, but still costing over £1,000 for an average repair.
The average warranty cost for this model is around £61.43 per month*.
Get a quick quote today and see how much you could save!
8. Audi Q7
In 8th position is the Audi Q7, with most of its issues relating to the brakes and fuel system, according to Warrantywise repair data.
The average warranty cost for this model is around £71.75 per month*.
Get a quick quote today and see how much you could save!
9. Mazda CX5
The Mazda CX5 has one of the lowest number of repairs in the top 10, but with an average repair cost higher than the Audi Q7 and Jaguar XJ, it’s 9th position for the CX5.
The average warranty cost for this model is around £50.24 per month*.
Get a quick quote today and see how much you could save!
10. Land Rover Range Rover
In 10th place and technically the most reliable of the top 10 least reliable, is the Land Rover Range Rover! The average repair costs for this model come in at over £1,000, with the main issues relating to the alternator and suspension.
The average warranty cost for this model is around £61.43 per month*.
Get a quick quote today and see how much you could save!
Want to see more? Check out the Warrantywise Top 10 Most Reliable Used Cars to see which makes and models are the most trustworthy.
Warrantywise is the only warranty company to release a live paid repairs list online, enabling customers to see the most common issues with their car and how much these can cost to fix. This is particularly useful when considering purchasing a high-end, luxury car as these tend to come with a hefty price-tag for repairs!
Warrantywise cover all makes and models and Roadside Assistance & Recovery is included with every warranty! Get your quick quote now!
NB: Warrantywise does not release data for cars unless it has a minimum of 100 vehicles as a sample amount. This data relates to repairs between 01/01/2018 and 30/04/2020 and may not represent the reliability of new vehicles as the cars Warrantywise has on cover are all over 3 years old.
*The warranty prices shown are based on an 08/80 level of cover, with a £50p/h labour cost, £100 voluntary contribution and a £3,000 repair limit.