Common Reasons for a "Check Engine" Light in a 1996 Cavalier:
* Oxygen Sensor (O2 Sensor): This sensor measures the amount of oxygen in the exhaust, and a faulty sensor can cause poor fuel economy and emissions.
* Mass Airflow Sensor (MAF Sensor): This sensor measures the amount of air entering the engine, and a faulty sensor can cause rough idling, poor acceleration, and higher emissions.
* Catalytic Converter: This device reduces harmful emissions, and a malfunctioning catalytic converter can cause poor performance and a "Check Engine" light.
* Spark Plugs/Wires: Faulty spark plugs or wires can cause misfires, leading to a "Check Engine" light.
* Fuel Injectors: Clogged or faulty fuel injectors can affect fuel delivery, causing misfires and a "Check Engine" light.
* Evaporative Emissions System (EVAP System): This system controls fuel vapor emissions, and a leak or malfunction can trigger the light.
* Engine Control Module (ECM): The ECM controls the engine's functions, and a malfunction can cause a variety of issues, including a "Check Engine" light.
* Loose Gas Cap: A loose gas cap can cause fuel vapor leaks and trigger the "Check Engine" light.
What to Do:
1. Get the code read: A code reader will display a diagnostic trouble code (DTC) that points to the potential cause of the problem. An auto parts store often offers this service for free.
2. Consult a repair manual: A repair manual for your 1996 Cavalier can provide detailed information on troubleshooting and fixing the problem.
3. Take it to a mechanic: If you're not comfortable fixing the issue yourself, take your Cavalier to a qualified mechanic. They can diagnose the problem and make the necessary repairs.
Important Note:
* Never ignore a "Check Engine" light, as it can signal a serious problem that could lead to further damage.
* Replacing the wrong parts can be expensive and may not fix the underlying issue.
* It's best to get a professional diagnosis before attempting any repairs.
