* Oxygen sensor: The oxygen sensor monitors the amount of oxygen in the exhaust gas. If the oxygen sensor is faulty, it can cause the engine to run rich or lean, which can lead to a variety of problems, including reduced performance, increased emissions, and poor fuel economy.
* Mass air flow sensor: The mass air flow sensor measures the amount of air that enters the engine. If the mass air flow sensor is faulty, it can cause the engine to run rich or lean, which can lead to a variety of problems, including reduced performance, increased emissions, and poor fuel economy.
* Spark plugs: The spark plugs ignite the air/fuel mixture in the cylinders. If the spark plugs are worn or damaged, they can cause the engine to misfire, which can lead to a variety of problems, including reduced performance, increased emissions, and poor fuel economy.
* Fuel injector: The fuel injectors deliver the fuel to the cylinders. If the fuel injectors are clogged or damaged, they can cause the engine to run lean or rich, which can lead to a variety of problems, including reduced performance, increased emissions, and poor fuel economy.
If the service engine soon light comes on in your 2003 Chevy Trailblazer, it is important to have it diagnosed by a qualified mechanic as soon as possible. This will help to prevent any further damage to the engine and can help to ensure that your Trailblazer is running smoothly and efficiently.
