I thought an update might be useful ...
Basically, we picked up a brand new F500 TA yesterday, supplied as a free of charge replacement by Fiat UK.
Having taken the car back to our dealer for a third time they, in conjunction with Fiat UK and the factory in Italy, said that our car was suffering from a known problem. If you jumped in the car and started the engine straightaway (as you do) the engine management system couldn't boot up in time and therefore wasn't ready to start receiving data from the sensors around the engine. Therefore it sent the error messages we were seeing on the dash. So, we were given the car back and told that trouble tickets had been raised with the Italian factory and they'd let us know when a resolution had been identified. We were given no timescale (by the way, that was the beginning of October and we never heard back).
All this didn't sound right to me so I read the warranty. All it said was that for a 3 year period any genuine warranty faults would be repaired free of charge - oh dear. So, given I had nothing to loose I phoned Trading Standards, expecting them to say that providing the warranty was being honoured there was nothing more that could be done - how wrong was I.
They said that given the fact that the car was purchased on finance we should pursue the finance company (FGA Capital) as the vehicle was not merchantable quality and our statutory rights (my wife's actually) as set out by the Supply of Goods Implied Terms Act 1973 had been contravened. And as such we were entitled to a replacement vehicle or a refund. We should write to the finance company giving them 7 days to respond. If the response was not as we wanted we should phone Trading Standards back for further advice and we were given a reference number.
We followed Trading Standard's instructions, and copied in the MD of Fiat UK plus the MD of our Fiat dealer. The initial response was to ask that car go back to the dealer for further assessment. We refused and repeatedly insisted that we wanted a refund or replacement. After a few robust but polite emails the Fiat UK Director's Office took up our case and got us a brand new car.
Assuming the new car doesn't go the same way as the original one we are well chuffed. Interestingly, the new car is a much smoother drive and the engine is much quieter which perhaps indicates the original vehicle had some fundamental issues.
Anyhow, the moral of the story is take proper advice so you know your rights, don't get fobbed off and stick to your guns.