Ford Fiesta 2010 Problems

If they haven't come back to you with the results of their testing then ask them what they have done and what they have found. Your experience is a relatively common one with today's cars. The source of your problem is probably a faulty sensor and the testing being done by your dealer should identify it and fix it. I wouldn't be too concerned about it. As for the extended warranty it really comes down to the confidence you have in the car. If you don't have confidence in the car then the money spent on the extended warranty is worthwhile, but if you feel confident that it will keep running without major trouble then I wouldn't take it. It's your decision, but my own view is that extended warranties are not worth buying. You should also be aware that it is not a factory product.

First I think the dealer has given you very poor advice, alloy wheels, while more susceptible to damage than the good old steel rims, are still capable of surviving on the roads we drive on for the life of the vehicle. It's probably too late now, but if I received that advice I would be getting the dealer to justify it, and would seek a second opinion.

The dealer is trying to fix the car for your, so you can only work with them to ensure a satisfactory outcome. The dealer has an obligation not only to repair the faults in the car, but also to return it to you in the same condition it was in when you handed it over to you. Before taking it back make sure you're happy with the state of the car as it's being handed back, and don't accept it if there is anything you are unhappy with. You could also have it inspected by an independent mechanic or engineers to confirm the work has been done to an acceptable standard.

We haven't received any reports of problems with wheel bearings on these cars. The Festiva was on the market for a long time and there was nothing to suggest there was a widespread problem with it, and while the Fiesta hasn't been here for a very long time it doesn't appear to have a history of problems in that area either.

They fill the tyre with foam that supports it until you can get it replaced or repaired. They are reliable, but the foam can be a pain in the backside for the tyre people who have to clean it out in the case the tyre is repairable, and you are probably over-reacting a little.

As you state Ford recommends 91-octane fuel for your car, so you would expect it to run on regular unleaded without a problem. I assume you have tried E10 unleaded, which generally has an octane rating of at least 94. If not it might be worth trying that, but   other than that go back to your dealer and point out to him that   you're not happy with your car and that you want it fixed.