Hi, I've had a similar issue. My Ford Fiesta Titanium went in for it's 1 year manufacturer's service yesterday. Had no warning lights/issues prior to this. It got the all clear, I drove it home without a problem and then this morning when I started the car, the Fuel In Oil Warning Lamp came on and stayed on. I called the garage and they said it must be a Servicing warning light that they hadn't reset and I just need to bring it in so they can plug it into the computer and clear the code. If this light comes on as a signal to get your car serviced and is a common issue that is easily resolved, why do they not refer to this in the manual rather than letting us panic that the garage cocked up the oil change? Is it safer to ask them to change the oil anyway or is this "resetting" thing most likely to be the problem. Don't want to do my car any damage unnecessarily, I've only had it a few months and love driving it.