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Guides

California Smog Check Guides

27 deep guides built on the state's own smog check data, the Health and Safety Code and DMV rules.

Who needs a smog check

DMV Authorized Smog Check Stations, BAR Licenses and How to Verify OneA DMV authorized smog station is one licensed by BAR. See the license types, how results reach DMV and how to verify a station at search.dca.ca.gov.Do I Need a Smog Check in California? The Complete RulesDoes your car need a California smog check? Rules by fuel, model year, sale and registration, with every exempt vehicle listed. Check your car now.Hybrid, Plug In, Electric and Natural Gas Cars and the California Smog CheckDo hybrids, plug in hybrids, EVs and natural gas cars need a California smog check? See the rules, exemptions and the hybrid test in one guide.California Smog Check Areas by County and ZIP CodeSee which California counties and ZIP codes need a biennial smog check. Full 58 county list and every ZIP code in the six partial counties.Smog Check When Buying or Selling a Car in CaliforniaWho pays for the smog check when you sell a car in California, how long it lasts, and which sales skip it. Read the 90 day rule before you list.Smog Check Exemption by Model Year in CaliforniaAdd 8 to the model year to find your first California smog check. See the lookup table for 2016 to 2027, the 4 year sale rule and the 1975 cutoff.Moving to California and Smog Checks for Out of State CarsMoving to California? Learn which out of state and imported cars need a smog check, the 49 state rule, military rules and Referee steps.

Buying, selling and moving

Smog Check History Lookup, How to Check Any California Car's Smog RecordLook up any California car's smog record for free by VIN or plate. Learn to read a VIR, how long a certificate lasts and the red flags of a fake pass.

Prices and fees

How Much Does a Smog Check Cost in CaliforniaThe average California smog check costs $69.66 as of September 2026, plus an $8.25 certificate fee on a pass. See prices by station type and year.Smog Check Coupons and Cheap Smog Checks in California, What Really Saves MoneyFind a cheaper California smog check using BAR price data by station type, the $8.25 certificate fee and what no pass no pay means. Compare before you go.

If you fail

Catalytic Converters and Smog Checks in California, CARB EO Numbers ExplainedCalifornia smog checks require a CARB approved catalytic converter with an EO number. Learn why non CARB parts fail, theft rules and P0420 steps.

Data and history

Smog Check Glossary, Every California Smog Term in Plain EnglishPlain English definitions for every California smog check term, from OIS, BAR 97 and ASM to STAR, CAP, EFMP and clean plugging. Each links to a full guide.California Smog Check by the Numbers, Stations, Inspectors and TestsEvery key smog check number for California from 2019 to 2026. 11.28 million tests in 2025, 7,329 stations and an 8.5% fail rate. Use and cite it.

Diesel and trucks

Clean Truck Check in California, Fees, Deadlines and TestingWhich trucks need CARB Clean Truck Check, how often you test, what it costs ($32.13 in 2026) and the October 2027 change. Plan your deadlines now.

Assistance

CAP Smog Repair Assistance in CaliforniaCAP pays up to $1,450 toward smog repairs for income eligible California owners. See 2026 income limits, the 20% co-pay and how to apply before you repair.

Obd

Check Engine Light and Smog Check in CaliforniaA check engine light fails a California smog check. See how the light is tested, what clears it right, and warranty and CAP options. Fix it the right way.Readiness Monitors and Smog Check in CaliforniaHow many readiness monitors may be incomplete on a California smog check, what the October 2025 rule means, and how long to drive after a battery change.

Diesel

Diesel Smog Check in California, Rules and ExemptionsDiesel cars and trucks from 1998 on need a California smog check up to 14,000 pounds, with no new car exemption. See the rules, tests and fixes.

Failed

Failed Smog Check in California, Step by StepFailed your California smog check? Follow the steps, check warranty, and see CAP help up to $1,450, retirement and the $650 waiver. Start with your report.California Smog Check Repair Cost Waiver and the BAR RefereeHow the $650 smog repair cost waiver works, how to book the Smog Check Referee, and what 550 waivers in 2025 tell you. Read before you spend.

Nevada

Nevada Smog Check Basics for Las Vegas and RenoWho needs a Nevada emissions test in Clark and Washoe counties, 2026 fee caps of $75.50 and $71.50, waivers and exemptions. Compare it with California.

Fees

California Smog Abatement Fee ExplainedWhat the California smog abatement fee on your DMV bill is, why it costs $20 then $25, where the money goes and when it ends. See your total.

History

History of the California Smog Check Program, 1984 to 2026When the California Smog Check Program started in 1984 and how its rules, tests and exemptions changed through 2026. A year by year timeline.

Stations

STAR Smog Check Stations and What Directed to STAR MeansWhat a STAR smog check station is, why DMV directed your car, how STAR scores work and what the 2025 BAR data shows about price and fail rates.

Money

California Vehicle Retirement Program, Sell Your Car to the StateHow much California pays to scrap your car, who qualifies, and how to apply. BAR retired 23,606 cars in fiscal year 2024 to 2025. Start here.

Process

What Happens During a Smog Check in CaliforniaSee what a California smog check tests on 2000 and newer cars and on 1999 and older cars, how long it takes, and what fails. Read before you go.

Failures

Why Cars Fail Smog Checks in California8.5% of California cars failed smog in 2025. See fail rates by model year, cause and station type from BAR data. Know your odds.