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A month after buying my 2009 Ford Fiesta new a knocking noise was discovered in the front of the car. The dealer told me to fill the car with premium fuel and other mechanics said there was nothing wrong, but the noise still is there and is getting worse on acceleration. What am I to do?
By the advice he gave you the dealer probably believed the engine was pinging, but switching to the higher-octane fuel did nothing to fix it. The car is still under warranty, so take it back to the dealer and ask that it be fixed again. If they can't fix it, ask them to consult Ford about the problem. Persist until it is fixed, long term pinging can cause damage to the engine.
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