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A P1299 code for a Ford Mustang typically indicates an issue with the engine's coolant temperature sensor or a related problem, such as overheating. To fix it, start by checking the coolant level and ensuring there are no leaks. Next, inspect the coolant temperature sensor and its wiring for damage or corrosion, and replace if necessary. If the issue persists, you may need to investigate further for potential engine overheating or thermostat malfunctions.

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2d ago

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