* Loose or damaged gas cap: A loose or damaged gas cap can cause the engine light to come on. This is because the gas cap helps to create a seal on the fuel tank, and when it is not properly sealed, it can allow fuel vapors to escape. These vapors can then cause the engine to run lean, which can trigger the engine light.
* Oxygen sensor problems: The oxygen sensors in your Milan help to monitor the amount of oxygen in the exhaust gas. This information is used by the engine control unit (ECU) to adjust the fuel mixture and keep the engine running efficiently. If an oxygen sensor is malfunctioning, it can cause the engine light to come on.
* Spark plug problems: Spark plugs are responsible for igniting the fuel in the engine. If a spark plug is worn out or damaged, it can cause the engine to misfire, which can trigger the engine light.
* Catalytic converter problems: The catalytic converter in your Milan helps to convert harmful pollutants in the exhaust gas into less harmful substances. If the catalytic converter is malfunctioning, it can cause the engine light to come on.
If the engine light on your Mercury Milan is staying on, it is important to have it diagnosed and repaired as soon as possible. Driving with a malfunctioning engine can cause damage to the engine and other components of your vehicle.
Here are some additional possible causes of the engine light staying on in a Mercury Milan:
* Faulty ignition coil: The ignition coil provides power to the spark plugs. If it is faulty, it can cause the spark plugs to misfire, which can trigger the engine light.
* Fuel injector problems: The fuel injectors in your Milan are responsible for spraying fuel into the engine. If a fuel injector is clogged or damaged, it can cause the engine to run lean, which can trigger the engine light.
* Mass air flow sensor problems: The mass air flow sensor measures the amount of air entering the engine. This information is used by the ECU to adjust the fuel mixture. If the mass air flow sensor is malfunctioning, it can cause the engine to run lean or rich, which can trigger the engine light.
* Vacuum leaks: A vacuum leak can cause the engine to run lean, which can trigger the engine light. Vacuum leaks can be caused by a number of things, such as a cracked hose or a loose connection.
