$25 for a State Smog Test at California Star Smog Test ($50 Value)

Harbor City

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$50 50% $25
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In a Nutshell

Certified technicians ensure cars pass muster for state smog requirements

The Fine Print

Promotional value expires 120 days after purchase. Amount paid never expires. May be repurchased every 90 days. Limit 1 per person, may buy 1 additional as gift. Limit 1 per visit. Must use promotional value in 1 visit. Valid only for option purchased. All goods or services must be used by the same person. All vehicles must be 2000 or newer under 10,000 lb. RVs excluded. Value does not include California licensing fees. State fees of $12 are additional and are due at the station once the vehicle passes inspection. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

The Deal

  • $25 for a state smog test ($50 value)

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.

Customer Reviews

Amazingly fast and friendly service! I definitely recommend this place.
Valerie S. · April 2, 2016
Great, friendly service from Jorge. He answered all my questions about the Smog check protocol and how they have a special computer they use in most circumstances instead of those roller things. I highly recommend him and his upfront services. He is generally open 9:30 to 6 inside the CarForce business lot in Bellflower, CA.
Megan L. · March 29, 2016
Great service!!
Joel F. · March 23, 2016

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