What’s Involved in an Emissions Inspection 

And Why It Matters for Santa Clarita Drivers 

What You Need to Know

At Valencia Auto Performance and Simply Smog, one of the most common services we perform is the emissions inspection, also known as a smog check. If you live in California, you already know it’s not just a good idea. It’s the law. But what exactly is involved in an emissions inspection? Why is it necessary? And what can you do if your vehicle doesn’t pass?  

Here’s a closer look at what goes into this essential part of vehicle ownership, especially in Santa Clarita, CA, where environmental standards are taken seriously.  

Why Emissions Inspections Matter and What’s Involved  

Emissions inspections ensure that your vehicle does not release excessive pollutants into the air. Cars and trucks release gases such as carbon monoxide, nitrogen oxides, and hydrocarbons, contributing to smog, acid rain, and health problems.  

The California Smog Check Program, managed by the Bureau of Automotive Repair (BAR), aims to reduce these emissions by regularly inspecting vehicles and requiring repairs when your emission systems are malfunctioning.  

In Santa Clarita, most vehicles must undergo a smog check every two years, starting when the vehicle is eight years old. However, certain cars (like diesel models and those with high annual mileage) may require more frequent testing.  

Here’s what typically happens during the inspection process:  

• Visual Inspection  
  • The technician begins with visually inspecting the vehicle’s emission control components.  
• This includes checking:  
  • The catalytic converter  
  • Exhaust gas recirculation (EGR) valve  
  • Positive crankcase ventilation (PCV) system  
  • Fuel evaporative system (EVAP)  
  • Oxygen sensors and wiring  

We’re looking for any signs of tampering, disconnected hoses, damaged wiring, or missing components.  

• Functional Inspection  
  • Next, we test key emission control systems to ensure they operate correctly.   
• Onboard Diagnostics (OBD-II) Scan  
  • For 1996 and newer vehicles, we connect to the vehicle’s OBD-II system to look for trouble codes, system monitors, and engine performance data. If your car’s onboard computer detects any issues with emissions control systems, the car will not pass until those issues are resolved.   
• Tailpipe Emissions Test   
  • We perform a tailpipe test for older vehicles or those not equipped with OBD-II systems. This involves placing a probe into the exhaust pipe while the engine runs on a dynamometer. We measure the levels of harmful gases emitted to determine if they fall within state-mandated limits.  

Overdue for Your Emissions Inspection?  

We’re not just another smog check station. We’re Santa Clarita’s trusted partner for honest, efficient, and certified emissions inspections. We are a STAR-certified smog station, which means we meet higher performance standards and can perform tests on all vehicles, including those with gross polluter status and test-only vehicles. Call us today at (661) 259-5600 to book an appointment.