Price
Call for price
Hours
Open 7 days a week
Station type
Test Only
McHenry Smog Center is a STAR certified test-only smog check station at 3536 Mchenry Ave Unit B, Modesto, CA 95356. Open 7 days a week.
Hours
- Monday
- 8:30 AM – 5 PM
- Tuesday
- 8:30 AM – 5 PM
- Wednesday
- 8:30 AM – 5 PM
- Thursday
- 8:30 AM – 5 PM
- Friday
- 8:30 AM – 5 PM
- Saturday
- 8:30 AM – 5 PM
- Sunday
- 8:30 AM – 1 PM
Hours from public business listings. Call to confirm before you go.
What to expect at McHenry Smog Center
McHenry Smog Center runs the inspection and issues the certificate but does no repairs. It is STAR certified, so it can test vehicles the DMV directs to a STAR station, including gross polluters.
Most smog checks take 15 to 30 minutes, and most visits are closer to 20.
What to bring
Your registration or DMV renewal notice
It says whether the car needs a STAR station.
The car, with the check engine light off
On a 2000-or-newer car, a lit check engine light fails the test on its own.
A way to pay
The $8.25 state certificate is paid on top of the test when the car passes, unless the station's price or coupon includes it.
What if I fail?
- McHenry Smog Center doesn't do repairs, so the car goes to a repair shop and comes back for the retest.
- BAR's Consumer Assistance Program pays up to $1,450 toward emissions repairs for income-eligible owners.
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3536 Mchenry Ave Unit B, Modesto, CA 95356
Get directions →Hours
- Monday
- 8:30 AM – 5 PM
- Tuesday
- 8:30 AM – 5 PM
- Wednesday
- 8:30 AM – 5 PM
- Thursday
- 8:30 AM – 5 PM
- Friday
- 8:30 AM – 5 PM
- Saturday
- 8:30 AM – 5 PM
- Sunday
- 8:30 AM – 1 PM
Hours from public business listings. Call to confirm before you go.
Also listed on
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4100 Mchenry Ave
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Central Valley Nissan
4530 N Mchenry Ave
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Central Valley Volkswagen Hyundai
4620 North Mchenry Avenue
Nearby cities in Stanislaus County
Questions about McHenry Smog Center
McHenry Smog Center is open Monday 8:30 AM to 5 PM; Tuesday 8:30 AM to 5 PM; Wednesday 8:30 AM to 5 PM; Thursday 8:30 AM to 5 PM; Friday 8:30 AM to 5 PM; Saturday 8:30 AM to 5 PM; Sunday 8:30 AM to 1 PM.
Verify this station’s license and STAR standing at bar.ca.gov.
Listing updated October 7, 2026.
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BAR field office: Fresno • Licensed since 2004