What Your Check Engine/Service Engine Light Means

What’s the difference between the maintenance due light and the check engine/service engine light on your vehicle?  When your check engine light illuminates on your dashboard, it’s more than just an inconvenience.  It’s your vehicle’s way of telling you that something needs attention.  At Wendle Nissan in Spokane WA, we understand the importance of keeping your Nissan in top condition and are here to help you decode what your check engine light might be indicating. 

1. Loose or Faulty Gas Cap: One of the most common and fixable issues is a loose or damaged gas cap.  A secure gas cap maintains pressure in your fuel system and helps reduce emissions.  If you check engine light comes on shortly after refueling, check your gas cap first.

2. Oxygen Sensor Issues: Your Nissan’s oxygen sensor monitors the amount of unburned oxygen in your exhaust system.  A faulty sensor can lead to decreased fuel efficiency and increased emissions.  This is a critical issue that needs addressing promptly.

3. Catalytic Converter Problems: The catalytic converter helps reduce harmful emissions.  If it’s not functioning properly, your vehicle might not pass emissions testing and can experience reduced performance.  This is an issue that requires professional attention. 

4. Mass Airflow Sensor Malfunction: The mass airflow sensor measures the amount of air entering the engine to ensure proper fuel-to-air ratio.  A malfunctioning sensor can lead to poor engine performance and reduced fuel economy.

5. Spark Plug or Ignition Coil Issues: Worn-out spark plugs or faulty ignition coils can cause your engine to misfire, leading to poor performance and potential damage to the catalytic converter. 

The maintenance due light is an indication that your vehicle is due for maintenance.  Maintenance reminders may include:

·  Oil service

·  Filter service

·  Tire rotation

·  Tire maintenance

·  Tire pressure

·  Other