D and H Enterprises Auto Repair

Smog Check Concord

Smog Check Concord

D&H Enterprises performs State required smog checks for many residents and commuters within Concord. Even though today's vehicles are sophisticated, computer integrated machines engineered to reduce smog emissions, it is still necessary to do a smog check to ensure that your vehicles is in proper operating condition.

California smog check state regulations require a check every two years on certain model years. In addition, Concord, and the whole of Contra Costa County, is an enhanced smog emissions testing area, which means that Concord and Contra Costa County residents are required to get their vehicles tested with specialized smog equipment that can actually simulate on-road driving conditions. D&H Enterprises uses smog check equipment that includes the state-of-the-art ESP System One® Bar-97 certified five-gas analyzer equipped with a dynamometer and Delphi Evaporative Emissions Tester.

Our smog checks may include the following tests:

  • Ignition timing
  • Ignition system
  • Vacuum leaks
  • Catalytic converter failure
  • Air injection system problems
  • Engine damage
  • Sensor problems
  • Computer problems
  • EGR system
  • Air/Fuel ratio
  • Restricted flow and low pressure
  • Thermostatic air cleaner
  • Early fuel evaporation

Bring your vehicle in for its DMV-required smog check to our Concord facility, located at 2689 Monument Road, Concord, CA 94520.

Got questions about your vehicle's smog check requirements? Feel free to Ask Jack, contact us for an appointment online, or call us at 925-356-0683.

Not sure where we are in Concord? Click here for a map to D&H Enterprises.

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  AAA Waranty     ACDelco Warranty     12 12 Warranty  
The AAA Warranty allows our customers to take advantage of a nationwide warranty at any AAA approved facility. Which means if your car needs repair in Florida, just look for an AAA approved shop.
Our ACDelco Warranty covers all ACDelco parts and products nationwide up to 12 months or 12,000 miles of the original repair date. Simply contact the toll free consumer assurance.
Our service is beyond compare. Our 12/12 Warranty guarantees that all parts and labor done at D&H Enterprises, is covered for 12 months or 12,000 miles whichever comes first!