STAR Smog Check vs. Test Only: What’s the Difference and Which Do You Need?

Understanding California’s Smog Check Programs

California’s smog check system can be confusing for vehicle owners. Two common types of smog checks you may encounter are STAR smog checks and Test Only checks. But what exactly sets these apart, and how do you know which one you need?

What is a Test Only Smog Check?

A Test Only station is exactly what it sounds like – a facility that can perform smog tests but cannot make any repairs. These stations are designed to provide unbiased testing without the potential conflict of interest that could arise from also offering repairs.

Key points about Test Only stations:

• They can conduct smog inspections for all vehicles
• They are not allowed to perform any repairs or adjustments
• Their sole purpose is to provide accurate, impartial smog test results

What is a STAR Smog Check?

STAR smog checks are part of a program implemented by California’s Bureau of Automotive Repair (BAR) to ensure more stringent emissions testing. STAR stations undergo additional oversight and must maintain high performance standards.

There are two types of STAR stations:

• STAR Test Only: Can perform tests but not repairs
• STAR Test & Repair: Can conduct both tests and repairs

STAR stations are held to higher standards and must:

• Use more advanced testing equipment
• Maintain a high level of inspection accuracy
• Undergo regular performance evaluations

When Do You Need a STAR Smog Check?

The California DMV determines which vehicles require a STAR smog check. You may be directed to a STAR station if:
• Your vehicle has been identified as a potential high polluter
• Your vehicle type has a history of high emissions
• You’ve been randomly selected as part of the state’s quality control process

How to Choose Between STAR and Test Only

In most cases, the choice is made for you:
• If your DMV renewal notice specifies a STAR smog check, you must go to a STAR station
• If no specific requirement is listed, you can choose any licensed smog check station

However, if you have concerns about potential conflicts of interest, a Test Only station might provide peace of mind, as they have no incentive to find issues that require repairs.

The Bottom Line: Quality Testing for Cleaner Air

Whether you’re directed to a STAR station or choose a Test Only facility, the goal remains the same: to ensure your vehicle meets California’s emissions standards. By understanding the differences between these options, you can navigate the smog check process with confidence and do your part for cleaner air in the Golden State.