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Diesel Smog Check Information

Beginning Jan. 1, 2010 required
for 1998 & Newer Diesel Vehicles


The new diesel smog test will apply to all 1998 and newer diesel powered vehicles under 14,000 GVWR. Diesel testing is implemented as a biennial program similar to the regular smog check program.

Hollywood Test Only is certified by the state of California, and uses all of the most current equipment to ensure fast, reliable, and efficient testing of all vehicles.

Diesel Inspection Procedure:

  1. Visual Test
  2. OBD II Test
  3. Visible Smoke Test

Visual Check:

  1. Crankcase Depression Regulator CDR) or Positive Crankcase Ventilation (PCV)
  2. Diesel Oxidation Catalyst (DOC)
  3. Diesel Particulate Filter (DPF)
  4. Nox Absorber
  5. EGR
  6. Fuel Injection
  7. Temperature and Pressure Sensors
  8. Wiring of Sensors/Switches/Computers
  9. Vacuum Line Connections to Sensor/Switches
  10. Other Diesel Emission-Related Components: Turbo/Supercharger, Exhaust/Intake, etc.

OBD II Check:

  1. "Check Engine Light" (MIL) is Operational
  2. MIL on/off
  3. OBD Readiness Status Codes

Visible Smoke Test:

  1. Idle Test
  2. Idle Crankcase (CDR/PCV) Test
  3. Snap Test

CLICK HERE to vist the Bureau of Automotive Repair Diesel Vehicle Smog Check Information website on up to date news and additional information about the new program.