1. Regular Maintenance - The most important thing you can do to help your vehicle pass smog and save fuel is to perform regular maintenance. This includes tune-ups, air cleaners, pcv valves,oil changes, fuel filters, oxygen sensors, etc. Check your vehicle owner's manual for proper maintenance intervals.
2. Warm up your car - Drive your vehicle for at least 5 minutes prior to arriving at the smog station. This will help ensure your vehicle is running at its proper operating temperature.
3. Change Dirty Oil - If your oil change is past due, go ahead and do it before the smog check. The PCV (positive crank case ventilation) system of your vehicle is designed to allow your engine to breath fumes located in oil compartments. Dirty oil may raise your vehicle's emissions.
4. Inflate Low Tires to Proper Pressure - During most smog inspections, we will need to drive your vehicle on a dynamometer as a part of the smog test. Properly inflated tires may improve the overall emissions by reducing engine load. We always check for tires that appear to have low pressure. Properly inflated tires also will save you alot of money in fuel costs. Check your tires often.