Landrover comes 1st and 3rd in the Used Car Unreliability Score

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Closing followed by BMW (M3/5), Audi (Q7), Mercedes (S class) and Porsche (Audi Q7 clone), Bentley (VAG owned) and Tesla.

There was a few cheap cars; a Peugeot, Ford Ranger, a Mazda in the list too Jules

Seeing as most of these luxury cars have common components especially in the electrical department and the being luxury have more electrical components perhaps a more fair report would be to name the common component supplier, most of them use ZF auto boxes the German cars all use the same injector system and I think there are only two turbo manufacturers, once a vehicle is used the maintenance history becomes a greater component in the failure rate. How much is a RR V8 engine and the labour for changing it, one also wonders about the failed diagnostics before the actual fault is found and how much that is added to the repair costs. my PC is slightly to the right of Genghis
2012 HSE SD4 In Orkney Grey now gone, best car ever.

Electrical issues clearly are a major source of breakdowns - the increasingly complexity of electrical systems, in particular sensors, ECU and software playing an important part in the unreliability. I think on of the problems is the lack of duplication of systems eg e only one sensor or ECU of each system.

For instance on SCUBA rebreathing systems knowing the oxygen levels inside the breathing circuit is critical. Oxygen sensors can give errors. For the ECU to know which Oxygen sensor is failing requires 3 sensors for the ECU to "know" which one of the 3 has failed. Jules