Your Ultimate Guide to Smog Checks in Northern California: An FAQ with West Mitsubishi


Receiving that DMV registration renewal notice with the dreaded “Smog Check Required” stamp can feel like a chore. What does the test involve? How do you pass? And most importantly, where should you go for a reliable, hassle-free experience in Northern California?

Navigating the world of emissions testing doesn’t have to be complicated. At West Mitsubishi in Orland, we believe an informed driver is a confident driver. That’s why we’ve compiled this ultimate FAQ guide to answer all your questions about California smog checks, drawing on the expertise of our certified service technicians.

1. What exactly is a California Smog Check and why is it so important?

A California Smog Check is a mandatory vehicle inspection program designed by the Bureau of Automotive Repair (BAR) to identify vehicles with excessive emissions and ensure they are repaired. The goal is simple: to reduce air pollution and improve the air we breathe.

In Northern California, where agriculture, industry, and beautiful natural landscapes coexist, maintaining clean air is crucial. Pollutants from vehicles, like hydrocarbons and nitrogen oxides, contribute to smog and can harm public health and the environment. Your smog check is a small but vital part of a statewide effort to keep our skies clear and our communities healthy.

2. How do I know if my vehicle needs a smog test this year?

Your DMV renewal notice is the definitive source—it will clearly state whether a smog check is required. However, here are the general rules:

  • Gasoline-powered vehicles that are more than eight model years old require a biennial (every two years) smog check.
  • Diesel-powered vehicles model year 1998 and newer with a Gross Vehicle Weight Rating of 14,000 lbs or less require a biennial smog check.
  • When you sell a vehicle that is more than four model years old, a smog check is required for the transfer of ownership.
  • When you bring a vehicle into California to be registered for the first time, it will need a smog check.

3. What actually happens during the smog test at West Mitsubishi?

The process is straightforward and efficient. Our certified technicians follow a state-regulated procedure that typically includes three key parts:

  1. Visual Inspection: The technician will inspect your vehicle’s emissions control components to ensure they are present and functioning correctly. This includes checking the catalytic converter, gas cap, and other critical parts for signs of tampering or damage.
  2. On-Board Diagnostics (OBD) Test: For vehicles model year 2000 and newer, the primary test involves connecting a scanner to your car’s OBD-II computer. This system monitors your vehicle’s performance and will report any faults in the emissions system.
  3. Emissions Test (Tailpipe Test): For some older vehicles, a probe is inserted into the exhaust pipe while the car is run on a dynamometer to measure the pollutants it emits directly.

Our team at West Mitsubishi uses the latest BAR-certified equipment to ensure your test is accurate and completed promptly.

4. How can I prepare my car to give it the best chance of passing?

While a well-maintained car should pass without issue, you can take a few steps to increase your odds:

  • Address the “Check Engine” Light: If this light is on, your vehicle will automatically fail the OBD test. Have the underlying issue diagnosed and repaired by our service team before your smog check.
  • Drive Before You Arrive: Drive your car at highway speeds for about 20-30 minutes before your appointment. This ensures the engine and catalytic converter are fully warmed up and operating at peak efficiency.
  • Perform Regular Maintenance: A car with a fresh oil change and a clean air filter runs cleaner. Ensure your routine maintenance is up to date.
  • Check Your Tires: Make sure your tires are inflated to the recommended pressure. This is especially important for tests involving a dynamometer, as it ensures the vehicle runs smoothly.

5. What’s the advantage of going to a dealership like West Mitsubishi over a “Test-Only” center?

This is one of the most important questions. While a “Test-Only” center can perform the smog check, they cannot perform any repairs. If your vehicle fails, you must take it to a separate repair shop to get it fixed, then return to the testing center.

West Mitsubishi is a “one-stop shop.” As a full-service repair facility, we offer the ultimate convenience:

  • If you pass: We’ll transmit the certificate to the DMV electronically, and you’re on your way.
  • If you fail: Our technicians can immediately diagnose the problem, provide you with a clear explanation and a fair quote, and perform the necessary repairs right here on-site. No need to drive all over town. This saves you time, stress, and money.

6. What are the most common reasons a vehicle fails its smog test?

Our technicians see a few common culprits:

  • Faulty Oxygen (O2) Sensor: This sensor measures the amount of oxygen in your exhaust and is critical for fuel efficiency.
  • Worn or Defective Catalytic Converter: This is the single most important emissions control device.
  • Loose or Leaky Gas Cap: A bad seal on your gas cap can allow fuel vapors to escape, causing a failure of the EVAP system test.
  • “Check Engine” Light On: As mentioned, this is an automatic failure.

The good news is that all of these issues are repairable by the expert service team at West Mitsubishi.

7. I live in Chico/Redding. Is it worth the drive to Orland for a smog test?

Absolutely. While there may be options closer to you, making the short drive to West Mitsubishi offers peace of mind. You get the assurance of factory-trained technicians, state-of-the-art diagnostic equipment, and the “one-stop shop” convenience for any potential repairs. For a service as important as a smog check, trusting an expert is always the best investment.

8. Okay, I’m convinced! How do I schedule my smog test?

Scheduling is easy! You can:

  • Call our Service Department directly at 530-936-2300.
  • Use our convenient online scheduling tool on the West Mitsubishi website.

Our service center is open Monday through Friday from 8:00 am to 5:30 pm at 624 6th Street, Orland, CA 95963. We look forward to helping you drive clean and stay compliant

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