California Smog Check Program Laws & Regulations California Smog
Check Program

Law & Requirement
How to Pass the Smog Check. It's a Easy 3-Part Test! How to Pass
the Smog Check

3-Part Smog Test!
FREE Smog Check Coupons. Station Photos & Details FREE Smog
Check Coupons

50% Off Deals!
STAR Smog Check Program STAR Smog Check
What is a STAR
smog station?
VIR Reports - FREE Online Smog Check Diagnosis Tool FREE Online Smog
Test Diagnosis

ASE Repair Advice
Get $500.00 Smog Repair Assistance Program (CAP) FREE $500 Smog
Check Repairs

CA CAP Assistance
Vehicle Buy Back Program - Cash for your Car CA Recycling
Vehicle Buy Back

Cash For Your Car
DMV Vehicle Registration Register Vehicle
in California

DMV Registration
Does My Car Need a Smog Check? Does My Car Need
a Smog Check?

Exempt Vehicles
Under Your Hood - The Visual Smog Inspection Visual Smog
Inspection

Under The Hood
Automotive Coupons & Classifieds Automotive
Classifieds

Post FREE Ads
FAQ's - California Emissions Questions & Answers Smog Check Q & A
California Emissions Questions & Answers
OBDII Check Engine Light Trouble Codes Check Engine Light Trouble Codes
OBD-II Code Chart
Ask-A-Tech - Do you have a Smog Check Question? Get a Response in 24 hours. Help? Ask-A-Tech!
ASE Certified Smog Test Assistance
Smog Test Only - What is a Test Only Smog Station? Smog Test
Only Centers

What are Test Only Smog Stations?
Remote Smog Check Sensing CA Roadside
Emission Test

Remote Smog Test Sensing Device
Home Page HOME



Diesel Smog Check in California

Diesel Smog Check - Since 2010 California has required all diesel trucks and diesel passenger cars which are 1998 model year or newer, and weight under 14,500 GVW, undergo a biennial smog inspection similar to their gasoline counterparts.

Any California certified smog check station is allowed to perform a diesel engine smog inspection. The diesel smog test will not include the emissions test portion of the regular inspection. There will be no tailpipe emissions inspection either. Diesel cars and trucks are not driven on a dynamometer during the smog test either.

The diesel smog test will focus on a visual inspection of your vehicle's emissions/smog components, a system check of the On Board Diagnostics (OBD II) system, a visual smoke check for excessive black (carbon) smoke, and an EVAP functional test. Diesel cars and trucks which fail the diesel smog test will have to get their vehicles repaired at a diesel vehicle repair shop before retesting.

Diesel smog inspections are required during a diesel vehicle's initial registration in California and once, every two years, thereafter. The diesel smog check cycle will continue for as long as the vehicle is registered in this State.

The Diesel smog test program applies to 1998 and newer passenger vehicles and trucks powered singly or in combination by:

  • Gasoline
  • Propane
  • Natural gas
  • Diesel
  • Methanol / Ethanol fuels

Smog inspections are also required anytime a diesel vehicle is sold or bought in California. During a title transfer the Department of Motor Vehicles will not allow a vehicle to be registered unless it is presented with a valid smog certificate. There are special testing procedures for vehicles, which are classified as "Gross Polluters". These include Test Only and State Referee inspections.

Diesel Smog Test Exemption: The DMV does not require a California emission inspection (smog check) for the following types of vehicles:

  • Any diesel car or diesel pickup truck which is 1997 model year or older.
  • Any diesel truck which weights over 14,500 GVW.

Miles:
Which Type Should I Choose?
 


Related Links: