During your drive, maybe even as soon as you start the engine, your vehicle realizes an emissions fault, and turns on the Check Engine or Service Engine Soon light.
No check engine light, but no chance of passing the emissions test either.
However, you will not know this until your vehicle is smog tested.
How often is smog check required in California?
Most vehicles in California are required to pass a Smog Check every two years for registration renewal. Your DMV Registration Renewal Notice will indicate if your vehicle needs a Smog Check. You may take your vehicle to any Smog Check station, unless it requires a Smog Check at a STAR station.
Will a pending code fail emissions California?
Answer: A pending trouble code should not cause your vehicle to fail the smog check. For 1996 to 1999 model vehicles both trouble codes and exhaust emissions are checked. 2000 & newer vehicles are only checked for trouble codes (no exhaust emission testing).
How old does a car have to be to not be smogged in California?
30 years old
Will a check engine light fail smog in CA?
If your check engine light is on, you’ll automatically fail your smog test. In the State of California, your auto mechanic cannot refuse to test your car if they see the light on. You can rely on their auto mechanics to change your oxygen sensor, or even replace your catalytic converter.
Does check engine light automatically fail emissions test?
If the ”Check Engine” light is illuminated on a 1996 or newer model year vehicle, the vehicle will fail the emissions inspection. An emissions-related problem has been detected by the vehicle’s on-board diagnostic (OBD) computer and it must be repaired before the vehicle will pass the emissions inspection.
Photo in the article by “Wikipedia”