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Top Rated Merchant

Smogster is a top merchant due to its average rating of 4.5 stars or higher based on a minimum of 400 ratings.


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Emissions and Smog Test for One Car at Smogster (Up to 50% Off). Two Options Available.

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Professional technicians administer state-required emissions and smog tests to ensure vehicles fit within regulations

Customer Reviews

100% Verified Reviews
All reviews are from people who have redeemed deals with this merchant.
1 ratings1 reviews
6 days ago
Super nice guy. Quick. Online reservation was easy. Great experience
27 ratings16 reviews
September 6, 2020
Really great customer service. Have taken 2 cars there and will definitely be a return customer.
28 ratings20 reviews2 photos
September 5, 2020
Quick and friendly. It was warming up outside, so I was able to sit in the office in the ac.
2 ratings2 reviews
August 15, 2020
Excellent service. The safety precautions they take made me feel very safe during the pandemic crisis.
August 7, 2020
Very courteous and efficient. Didn’t get in my car and wore masks. About as contactless as possible. Accepted my Groupon with no problem. Good experience.
1 ratings1 reviews
September 19, 2020
Couldn’t have a more positive experience.
3 ratings1 reviews
September 2, 2020
One person was working! But he was very accommodating and I didn’t have to wait too long.
1 ratings1 reviews
August 28, 2020
Quick & convenient what more can you ask for
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What You'll Get

  • Additional fees apply for certificate and electronic transfer.

Catalytic Converters: Keeping Combustion Clean

Cleaner cars make for cleaner air. Learn how catalytic converters help with Groupon’s guide.

A car’s engine is a dirty place, and it produces even dirtier exhaust. Vapors exit the combustion chamber carrying a nasty trio of smog promoters: nitrogen oxides, hydrocarbons, and carbon monoxide. As these pollutants barrel through the exhaust manifold (the set of tubes that feeds exhaust from each cylinder into the exhaust pipe), there’s only one thing standing between them and the innocent air outside: the three-way catalytic converter.

Situated just before the muffler, the converter is home to honeycombed ceramic cores coated with some combination of platinum, rhodium, and palladium—three rare metals that interact with the main components of the pollutants. When exhaust enters, the metals trigger chemical reactions that heat the gasses and rearrange their molecules. Under their influence, nitrogen oxides splinter into pure oxygen and nitrogen, while hydrocarbons and carbon monoxide are oxidized into less-harmful carbon dioxide and simple water. Since their introduction during the 1975 model year, these unseen cleaners have made air more breathable and much tastier: the EPA estimates that cars built today are 98% cleaner than their counterparts from the 1960s.

The Fine Print

Promotional value expires 120 days after purchase. Amount paid never expires. Appointment required, same day appointments accepted. Additional $8.25 fee applies for certificate and $5 for electronic transfer. Limit 1 per person, may buy 1 additional as gift(s). May be repurchased every 90 days. Limit 1 per visit. Must use promotional value in 1 visit(s). Valid only for option purchased. All goods or services must be used by the same person. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

About Smogster