Why Cars Don’t Pass Smog Checks

by Chris Bjorklund


Do you know the #1 reason that cars don’t pass their smog check? According to Diamond Certified smog check experts, a “check engine” / “service engine soon” light ON and/or high tail pipe emissions are the main reasons. The state sets the maximum allowed limits for hydrocarbons, carbon monoxide, oxides of nitrogen, referred to as “NOX”. A worn out catalytic converter can also be one of the many causes for not passing.

Each smog check station has its own policy as to whether they charge you for a failure. The state does not regulate that. In general, shops set their own prices for all smog checks, other than the state regulated $8.25 for the Smog Certificate. If your car fails the smog test close to the registration deadline, you may ask DMV for an extension to make failed smog related repairs.

Use Diamond Certified Resource to find top rated companies.

Local, Top Rated Diamond Certified Companies Related to Your Topic
Santa Clara County Smog Shops
Sonoma County Smog Shops
Alameda County Smog Shops
San Francisco Auto Repair Shops
Marin County Auto Repair Shops 

Related Articles
The Essential Guide to Car Repairs and Maintenance
Get Expert Advice From Owners of Top Rated Local Companies
Become a Diamond Certified Preferred Member (Always Free)