Question

How long does a smog check take​?

Ideally, a smog check takes 15 to 30 minutes for most vehicles. However, the actual time can vary depending on your vehicle’s age, the station’s workload, and whether they found any issues with your vehicle.

What are the factors that affect the length of a smog check?

These are some factors that impact the time taken for your vehicle’s smog check.

• Age of your vehicle: If you own a new vehicle, it can go through the smog check process quickly. An older vehicle will take longer to finish the process.
• Wait time: Scheduling the check during off-peak hours or choosing a ‘drive-thru’ option can cut down the total time. Some stations may offer the service in under 15-20 minutes.
• Process: The inspection process itself can take time as it involves steps like a visual check, a gas cap pressure test, an OBD check, and an emissions test.

How to have a faster smog check for your vehicle

• Warm up your vehicle’s engine: Before the test, drive your vehicle for about 20 minutes to make sure it reaches its optimal operating temperature.
• Inspect the check engine light: Always ensure that the check engine light isn’t on. If it is on, it indicates an issue in your vehicle. So, you must diagnose the issue and do the required repairs before taking your vehicle for the smog check.
• No recent battery changes: Avoid replacing or disconnecting your vehicle’s battery just before the check, as it will result in the powertrain control module not having the required ‘readiness monitors’ set. This will cause a failure or delay in the check.