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400 Railroad Ave, Winters

Smog Check for One or Two Vehicles at Auto Masters (Up to 47% Off)

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Technicians test vehicles’ exhaust pipes and parts to ensure smog levels are in compliance with the law

Customer Reviews

100% Verified Reviews
All reviews are from people who have redeemed deals with this merchant.
1 ratings1 reviews
August 9, 2021
Fast and friendly service!
1 ratings1 reviews
April 3, 2020
Went in without an appointment for a Smog check with Groupon, took me right away and was out 20 minutes later. As a bonus the drive to Winters is scenic and relaxing. Staff was courteous and professional, highly recommended. Car is a 2008 BMW 328i
1 ratings1 reviews
July 22, 2017
They got me in for a smog check with no hassle and had it done quicker than they predicted. I would consider bringing my car back for repairs.
1 ratings1 reviews
March 22, 2017
They were fast & friendly. I went there thinking I was gonna have to wait an hour or longer, but I was there for a total of maybe 20 mins. 5/5 honestly
1 ratings1 reviews
January 11, 2017
I purchased the Groupon and stopped by to see if I could schedule an appointment for a smog check with certificate. The technicians were able to squeeze me in before work! Walked to a nearby coffee shop for lunch, and they had my car ready by the time I came back. Fast and friendly. I would definitely recommend.
8 ratings3 reviews
August 17, 2016
Fast and friendly.

About This Deal

Choose Between Two Options

  • $38 for a smog check for one vehicle ($70 value)
  • $73 for a smog check for two vehicles ($140 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.

Fine Print

Promotional value expires 120 days after purchase. Amount paid never expires. Limit 12 per person. Limit 1 per visit. Must use promotional value in 1 visit. Valid only for option purchased. $8.25 additional cost for vehicles that pass smog check and need certificate. Appointments are recommended and subject to availability. May be repurchased every 365 days. Valid only for year 2000 and newer cars. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

About Auto Masters