* Oxygen sensor: The oxygen sensor monitors the amount of oxygen in the exhaust gas and helps the engine control module (ECM) adjust the air-fuel mixture accordingly. If the oxygen sensor is faulty, the ECM may not be able to adjust the air-fuel mixture correctly, which can lead to a check engine light.
* Spark plugs: The spark plugs provide the spark that ignites the air-fuel mixture in the cylinders. If the spark plugs are worn out or damaged, they may not be able to produce a strong enough spark, which can lead to a check engine light.
* Fuel injector: The fuel injectors spray fuel into the cylinders. If a fuel injector is clogged or damaged, it may not be able to spray the correct amount of fuel into the cylinders, which can lead to a check engine light.
* Mass air flow sensor: The mass air flow sensor measures the amount of air flowing into the engine. If the mass air flow sensor is faulty, the ECM may not be able to adjust the air-fuel mixture correctly, which can lead to a check engine light.
In addition to these common causes, a check engine light can also be triggered by a variety of other factors, such as:
* A faulty emissions control system
* A transmission problem
* A problem with the electrical system
If your 1995 Ford Contour's check engine light comes on, it's important to have the vehicle diagnosed by a qualified mechanic as soon as possible. The mechanic will be able to determine the cause of the light and recommend the necessary repairs.
