Smog Testing Tips For Older Vehicles

People are sometimes surprised to discover that a few simple acts may help them pass their smog test. This is especially true if you are testing an older vehicle.

Keep in mind, if your car has a failing emissions system, there is little you can do to pass a smog check. But if your vehicle is borderline between passing or not passing, one of these tips may push you over enough to recertify your vehicle.

Here are some tips to consider:

Warm-up your engine.

A smog check should always be performed on a vehicle with a warm engine. Ideally, the car should have been driven at least 20 minutes before arriving at our facility. This will help ensure that your car’s engine will reach the proper fuel mixture and combustion levels. So run a few errands before you get your smog check. The pizza you picked up on the way will still be hot enough to eat when you get home.

Don’t replace your car battery right before the test.

Your car’s internal test monitors may be erased if your car battery is disconnected. We need access to this monitored information in order to complete your smog test. If you recently disconnected or replaced your car battery, wait a week until getting your smog check completed. Make sure you drive at least 100 to 200 miles before bringing it into our San Jose location.

Get your oil changed before you smog check.

Some people don’t realize that dirty engine oil can negatively affect a smog check. Dirty fumes that come from dirty oil may become part of the engine’s combustion. This means that dirty oil can lead to a bad emissions report. Plus, dirty oil is terrible for your car.

Make sure your tires are properly inflated.

Tire pressure? What does that have anything to do with a smog test? Surprisingly, it does. During a smog test, a technician may drive your car on a dynamometer to obtain the necessary readings. Proper tire pressure is required to make sure your car remains stable during the test. As surprising as it may sound, a car’s tire pressure can be a critical factor in passing a smog check, especially for borderline cases.

Understand why your check engine light is on before your smog test.

It should not be a surprise that cars displaying their check engine lights are less likely to pass a smog check. In fact, if your check engine light is on, it may result in an automatic failure.
Now that you know these tips on passing your smog, visit San Jose Smog Check. We are a star-certified, test-only agency. We have a clean, comfortable waiting room, an accommodating staff, and complimentary reviews.

Although we can’t promise that your car will pass the smog test, we can guarantee that we will do all we can to make your experience as positive as possible.

This article was originally posted at San Jose Smog Check.

san jose smog check station

smog check station near me

smog check near me