- 1970s–1981 Factory-verifiedGM Heritage factory kit — 1981 Chevrolet Camaro, p.39.
YF5 Factory-verified
Also described as California emission equipment/certificationCalifornia Assembly Line Emission TestCalifornia Emission Test/EquipmentCalifornia Emission Test/CertificationCalifornia Emissions CertificationCalifornia emissions certificationEmission testedCalifornia assembly line emission testCalifornia vehicle emissions registrationCertification, emission, California state requirementsEmissions, California requirementsEmissions, California state requirementsEmission certificate, CaliforniaEmission system, CaliforniaEmission requirement, CaliforniaEmissions, CaliforniaCalifornia emissionsEmission requirements, CaliforniaCertification emission, CaliforniaEmissions, california requirementsEmission system, California requirementsEmissions certification, CaliforniaEmission certification, CaliforniaEmission system, California customer
Also documented for BuickCadillacGMCHummerOldsmobilePontiacSaturn
Documented applications
- 1972 Factory-verifiedGM Heritage factory kit — 1972 Chevrolet Chevelle, p.54.
- 1972 Confirmed
$15.80; 1,967 built
- 1973 Factory-verified
$15.00; 3,008 built
GM Heritage factory kit — 1973 Chevrolet Corvette, p.34. - 1974 Factory-verified
$20.00; qty NA
GM Heritage factory kit — 1974 Chevrolet Corvette, p.30. - 1975 Factory-verified
$20.00; 3,037 built (price and count: Corvette Black Book)
GM Heritage factory kit — 1975 Chevrolet Corvette, p.28. - 1976 Factory-verified
$50.00; 3,527 built
GM Heritage factory kit — 1976 Chevrolet Corvette, p.22. - 1977 Factory-verified
$70.00; 4,084 built
GM Heritage factory kit — 1977 Chevrolet Corvette, p.48. - 1978 Disputed
3,405 built; price disputed: CAC page shows $70, CorvSport and CorvetteStory both show $75; factory kit confirms RPO YF5 but its price column is not legible, so the split is unresolved
GM Heritage factory kit — 1978 Chevrolet Corvette, p.22. - 1979 Factory-verified
$83.00; 3,798 built (price: Corvette Black Book, which gives no count)
GM Heritage factory kit — 1979 Chevrolet Corvette, p.33. - 1980 Factory-verified
$250.00; 3,221 built (required LG4 305ci engine)
GM Heritage factory kit — 1980 Chevrolet Corvette, p.62. - 1981 Factory-verified
$46.00; 4,951 built (L81 was 50-state legal, so no engine substitution needed)
GM Heritage factory kit — 1981 Chevrolet Corvette, p.5. - 1982 Factory-verified
$46.00; 4,951 built (both figures identical to 1981 in all sources consulted — as printed)
GM Heritage factory kit — 1982 Chevrolet Corvette, p.30.
- 1963–70s (varies) Confirmed
- 1972, 1975–1978 Factory-verifiedGM Heritage factory kit — 1972 Chevrolet Nova, p.61.GM Heritage factory kit — 1978 Chevrolet Nova, p.56.
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the 1988 page prints only YFS, so 1988 is left out; 1994 from the order guide's emission requirements entry (p.37), as p.10 prints YF5 only inside the NC7 override's cross-reference and its own line reads YFS.
GM Heritage factory kit — 1986 Chevrolet Astro Van, p.11.GM Heritage factory kit — 1987 Chevrolet Astro Van, p.25.GM Heritage factory kit — 1993 Chevrolet Astro Van, p.12.GM Heritage factory kit — 1994 Chevrolet Astro Van, p.37.
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1998 list reads "Emissions: California". The 1995 to 1997 guides print California emission requirements.
GM Heritage factory kit — 1995 Chevrolet Astro Van, p.12.GM Heritage factory kit — 1996 Chevrolet Astro Van, p.17.GM Heritage factory kit — 1997 Chevrolet Astro Van, p.35.
- GM Heritage factory kit — 2007 Chevrolet Avalanche, p.148.
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; ; ;
GM Heritage factory kit — 2004 Chevrolet Aveo, p.24.GM Heritage factory kit — 2005 Chevrolet Aveo, p.25.GM Heritage factory kit — 2006 Chevrolet Aveo, p.25.
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;
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the 1995 order guide prints YFS; same description as cavalier-gen2 and cavalier-gen3
GM Heritage factory kit — 1990 Chevrolet Beretta, p.13.GM Heritage factory kit — 1994 Chevrolet Beretta, p.12.GM Heritage factory kit — 1996 Chevrolet Beretta, p.10.
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; 2LT, 3LT, RS: O; Premier: O (2025 only)
- GM Heritage factory kit — 1993 Chevrolet Blazer, p.9.GM Heritage factory kit — 1994 Chevrolet Blazer, p.9.
- GM Heritage factory kit — 1983 Chevrolet Blazer, p.7.GM Heritage factory kit — 1984 Chevrolet Blazer RV Full Size, p.16.GM Heritage factory kit — 1985 Chevrolet Blazer RV Full Size, p.6.GM Heritage factory kit — 1986 Chevrolet Blazer, p.10.
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1984, 1985 and 1988 print the code only in power team headings and cross-references; the merged second-generation doc writes Certification, emission, California
GM Heritage factory kit — 1983 Chevrolet S 10 Blazer, p.6.GM Heritage factory kit — 1986 Chevrolet S 10 Blazer, p.6.GM Heritage factory kit — 1987 Chevrolet S 10 Blazer, p.42.GM Heritage factory kit — 1989 Chevrolet Blazer, p.15.GM Heritage factory kit — 1994 Chevrolet S 10 Blazer, p.21.
- GM Heritage factory kit — 1995 Chevrolet S 10 Blazer, p.7.GM Heritage factory kit — 1996 Chevrolet S 10 Blazer, p.6.GM Heritage factory kit — 1997 Chevrolet S 10 Blazer, p.10.
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2017: LT, Premier: O
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O: 400, 600;
- GM Heritage factory kit — 1982 Chevrolet Camaro, p.35.GM Heritage factory kit — 1983 Chevrolet Camaro, p.35.GM Heritage factory kit — 1984 Chevrolet Camaro, p.7.GM Heritage factory kit — 1985 Chevrolet Camaro, p.33.GM Heritage factory kit — 1986 Chevrolet Camaro, p.39.GM Heritage factory kit — 1987 Chevrolet Camaro, p.15.GM Heritage factory kit — 1988 Chevrolet Camaro, p.35.GM Heritage factory kit — 1989 Chevrolet Camaro, p.35.GM Heritage factory kit — 1990 Chevrolet Camaro, p.37.GM Heritage factory kit — 1991 Chevrolet Camaro, p.31.GM Heritage factory kit — 1992 Chevrolet Camaro, p.85.
- GM Heritage factory kit — 1993 Chevrolet Camaro, p.9.GM Heritage factory kit — 1994 Chevrolet Camaro, p.7.GM Heritage factory kit — 1995 Chevrolet Camaro, p.8.GM Heritage factory kit — 1996 Chevrolet Camaro, p.14.GM Heritage factory kit — 1997 Chevrolet Camaro, p.8.GM Heritage factory kit — 1998 Chevrolet Camaro, p.9.
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GM Authority 2014 RPO list
- GM Heritage factory kit — 1988 Chevrolet Caprice, p.12.GM Heritage factory kit — 1990 Chevrolet Caprice, p.9.
- GM Heritage factory kit — 1994 Chevrolet Caprice, p.11.GM Heritage factory kit — 1995 Chevrolet Caprice, p.7.GM Heritage factory kit — 1996 Chevrolet Caprice, p.11.
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A
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; 1LS, 2LS, 1LT, LTZ: O
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1989–1992: requires air conditioning with some power teams
GM Heritage factory kit — 1989 Chevrolet Cavalier, p.10.GM Heritage factory kit — 1991 Chevrolet Cavalier, p.13.GM Heritage factory kit — 1992 Chevrolet Cavalier, p.9.GM Heritage factory kit — 1994 Chevrolet Cavalier, p.2.
- GM Heritage factory kit — 1995 Chevrolet Cavalier, p.8.GM Heritage factory kit — 2005 Chevrolet Cavalier, p.89.
- GM Heritage factory kit — 1989 Chevrolet Celebrity, p.5.
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; 2018 guide: 1LS, 1LT: O
- GM Heritage factory kit — 1983 Chevrolet Truck, p.14.GM Heritage factory kit — 1984 Chevrolet Truck, p.37.GM Heritage factory kit — 1985 Chevrolet Truck, p.36.GM Heritage factory kit — 1986 Chevrolet Truck, p.166.GM Heritage factory kit — 1987 Chevrolet Truck, p.51.
- GM Heritage factory kit — 2007 Chevrolet Cobalt, p.31.
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; 2015: O on all trims; 2018 from GM's 2018 Colorado order guide (PDF); 2021 from the upfitter list GM files for 2021 and 2022
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; O on all trims
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same description as beretta-gen1
GM Heritage factory kit — 1989 Chevrolet Corsica, p.13.GM Heritage factory kit — 1990 Chevrolet Corsica, p.12.GM Heritage factory kit — 1994 Chevrolet Corsica, p.10.GM Heritage factory kit — 1995 Chevrolet Corsica, p.8.GM Heritage factory kit — 1996 Chevrolet Corsica, p.6.
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the 1995 coupe guide prints YFS
GM Heritage factory kit — 1994 Chevrolet Corvette, p.25.GM Heritage factory kit — 1995 Chevrolet Corvette, p.25.GM Heritage factory kit — 1996 Chevrolet Corvette, p.83.
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Heritage order guides only (1997 prints "California Emission Requirement")
GM Heritage factory kit — 1997 Chevrolet Corvette, p.7.GM Heritage factory kit — 1998 Chevrolet Corvette, p.10.GM Heritage factory kit — 1999 Chevrolet Corvette, p.16.GM Heritage factory kit — 2003 Chevrolet Corvette, p.109.GM Heritage factory kit — 2003 Chevrolet Corvette, p.117.GM Heritage factory kit — 2003 Chevrolet Corvette, p.127.
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2005 from the order guide (HK p.99, p.105); the 2005 list does not print it.
GM Heritage factory kit — 2005 Chevrolet Corvette, p.99.
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2016, 2019: from GM order-guide copies (Corvette Action Center; 2019 also GM Authority)
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; all: O
- GM Heritage factory kit — 1983 Chevrolet El Camino, p.5.GM Heritage factory kit — 1984 Chevrolet El Camino, p.5.GM Heritage factory kit — 1985 Chevrolet El Camino, p.11.GM Heritage factory kit — 1986 Chevrolet El Camino, p.5.GM Heritage factory kit — 1987 Chevrolet El Camino, p.45.
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2005, 2007 from the 2005 and 2007 kit order guide; the factory list of those years has no entry.
GM Heritage factory kit — 2005 Chevrolet Equinox, p.90.GM Heritage factory kit — 2007 Chevrolet Equinox, p.92.
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; O on all trims
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order guide emission requirement
GM Heritage factory kit — 1996 Chevrolet G Van, p.63.GM Heritage factory kit — 1997 Chevrolet Express, p.26.GM Heritage factory kit — 1998 Chevrolet Express, p.20.GM Heritage factory kit — 1999 Chevrolet G Van, p.35.
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; the 2025–2027 guides read Emissions, California state requirements; O: Cargo 1WT, Cutaway 1WT, Cutaway 2WT (2025–2026), Passenger 1LS, Passenger 1LT
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.
GM Heritage factory kit — 1983 Chevrolet Vandura, p.12.GM Heritage factory kit — 1984 Chevrolet G Van, p.14.GM Heritage factory kit — 1986 Chevrolet G Van, p.21.GM Heritage factory kit — 1988 Chevrolet Vandura, p.16.GM Heritage factory kit — 1993 Chevrolet G Van, p.23.GM Heritage factory kit — 1994 Chevrolet G Van, p.12.GM Heritage factory kit — 1995 Chevrolet G Van, p.5.
- GM Heritage factory kit — 2006 Chevrolet HHR, p.103, p.110, p.117.
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; all trims: O
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the 1995 guide names it only inside the NC7 line, not as its own entry, so 1995 is left out
GM Heritage factory kit — 1994 Chevrolet Impala, p.4.GM Heritage factory kit — 1996 Chevrolet Impala, p.11.
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Order guides call it California state requirements emissions.
GM Heritage factory kit — 2003 Chevrolet Impala, p.99.GM Heritage factory kit — 2005 Chevrolet Impala, p.100.
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same description as beretta-gen1
GM Heritage factory kit — 1991 Chevrolet Lumina, p.14, p.16, p.18.GM Heritage factory kit — 1993 Chevrolet Lumina, p.10, p.12, p.13, p.14, p.16, p.18.
- GM Heritage factory kit — 1995 Chevrolet Lumina, p.10.GM Heritage factory kit — 1995 Chevrolet Lumina, p.12.GM Heritage factory kit — 1996 Chevrolet Lumina, p.18.GM Heritage factory kit — 1996 Chevrolet Lumina, p.22.GM Heritage factory kit — 1999 Chevrolet Lumina, p.12.GM Heritage factory kit — 1999 Chevrolet Lumina, p.14.
- GM Heritage factory kit — 1983 Chevrolet Malibu, p.21.GM Heritage factory kit — 1983 Chevrolet Malibu, p.23.
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1997 from the Malibu kit order guide.
GM Heritage factory kit — 1997 Chevrolet Malibu, p.12.GM Heritage factory kit — 1998 Chevrolet Malibu, p.6.GM Heritage factory kit — 1999 Chevrolet Malibu, p.27.GM Heritage factory kit — 2003 Chevrolet Malibu, p.81.
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shared Epsilon code (Pontiac G6, Saturn Aura).
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; all trims: O
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; all trims: O; GM's 2016 Malibu order guide
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; all trims: O
- GM Heritage factory kit — 1983 Chevrolet Monte Carlo, p.30.GM Heritage factory kit — 1984 Chevrolet Monte Carlo, p.36.GM Heritage factory kit — 1985 Chevrolet Monte Carlo, p.32.GM Heritage factory kit — 1986 Chevrolet Monte Carlo, p.34.GM Heritage factory kit — 1987 Chevrolet Monte Carlo, p.44.GM Heritage factory kit — 1988 Chevrolet Monte Carlo, p.34.
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emissions.
GM Heritage factory kit — 1995 Chevrolet Monte Carlo, p.13.GM Heritage factory kit — 1998 Chevrolet Monte Carlo, p.11.GM Heritage factory kit — 1999 Chevrolet Monte Carlo, p.14.
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Also in the kit's Monte Carlo order guide.
GM Heritage factory kit — 2006 Chevrolet Monte Carlo, p.116.
- GM Heritage factory kit — 1983 Chevrolet Motorhome, p.5.GM Heritage factory kit — 1984 Chevrolet Motorhome, p.7.GM Heritage factory kit — 1985 Chevrolet Motorhome, p.13.GM Heritage factory kit — 1986 Chevrolet Motorhome, p.7.GM Heritage factory kit — 1987 Chevrolet Motorhome, p.11.GM Heritage factory kit — 1988 Chevrolet Motorhome, p.7.GM Heritage factory kit — 1989 Chevrolet Motorhome, p.9.GM Heritage factory kit — 1994 Chevrolet Motorhome, p.5.GM Heritage factory kit — 1995 Chevrolet Motorhome, p.8.GM Heritage factory kit — 1996 Chevrolet Motorhome, p.6.GM Heritage factory kit — 1997 Chevrolet Motorhome, p.4.GM Heritage factory kit — 1998 Chevrolet Motorhome, p.7.
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some pages print YFS
GM Heritage factory kit — 1987 Chevrolet Nova, p.12.GM Heritage factory kit — 1988 Chevrolet Nova, p.10.GM Heritage factory kit — 1988 Chevrolet Nova, p.12.
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1998-1999 lists print "California Emission Requirements"
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1984 from a requirement remark
GM Heritage factory kit — 1982 Chevrolet S 10, p.8.GM Heritage factory kit — 1983 Chevrolet S 10, p.37.GM Heritage factory kit — 1984 Chevrolet S 10, p.14.GM Heritage factory kit — 1985 Chevrolet S 10, p.17.GM Heritage factory kit — 1986 Chevrolet S 10, p.9.GM Heritage factory kit — 1988 Chevrolet S 10, p.84.GM Heritage factory kit — 1989 Chevrolet S 10, p.40.
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1999 from the S-10 Electric list
GM Heritage factory kit — 1994 Chevrolet S 10, p.15.GM Heritage factory kit — 1995 Chevrolet S 10, p.10.GM Heritage factory kit — 1996 Chevrolet S 10, p.15.GM Heritage factory kit — 1997 Chevrolet S 10, p.13.
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2025–2027: A in all groups
- GM Heritage factory kit — 2003 Chevrolet Silverado 1500, p.205.GM Heritage factory kit — 2003 Chevrolet Silverado SS, p.208.GM Heritage factory kit — 2007 Chevrolet Silverado, p.62.
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years from Heritage kit pages, not in GM’s service list of that year: 2003 (order guide)
GM Heritage factory kit — 2003 Chevrolet Silverado 2500, p.201.GM Heritage factory kit — 2005 Chevrolet Silverado 2500HD, p.193.
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2017: GM's 2017 Silverado 2500HD order guide; 2018: GM's 2018 Silverado 2500HD order guide; 2019: GM's 2019 Silverado 2500HD order guide
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only in: 2500 HD, 3500 HD, 3500 HD chassis cab
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; all trims: O
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1LT, 2LT: O
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; all trims: O; 2018 from GM's 2018 order guide
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1985 not claimed (the 1985 guide prints YFS); some 1986 pages print YFS or YFE
GM Heritage factory kit — 1986 Chevrolet Sprint, p.8.GM Heritage factory kit — 1986 Chevrolet Sprint, p.11.GM Heritage factory kit — 1986 Chevrolet Sprint, p.14.
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; O; 50-state certified
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a free-flow emissions option in the kit guides, not in the lists
GM Heritage factory kit — 2003 And 2004 Chevrolet SSR, p.91.GM Heritage factory kit — 2005 Chevrolet SSR, p.99.
- GM Heritage factory kit — 1992 Chevrolet Suburban, p.18.GM Heritage factory kit — 1993 Chevrolet Suburban, p.4.GM Heritage factory kit — 1994 Chevrolet Suburban, p.8.GM Heritage factory kit — 1995 Chevrolet Suburban, p.9.GM Heritage factory kit — 1996 Chevrolet Suburban, p.7.GM Heritage factory kit — 1997 Chevrolet Suburban, p.11.
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The 2014 guide words it as emissions, California state requirements. Trim marks in the 2014 guide: LS, LT, LTZ: O.
GM Heritage factory kit — 2007 Chevrolet Suburban, p.160, p.173.
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A on all trims; 2018–2019 from GM's 2018 and 2019 Suburban order guides (GM Authority copies)
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1989 from the option weight table
GM Heritage factory kit — 1983 Chevrolet Suburban, p.13.GM Heritage factory kit — 1984 Chevrolet Suburban, p.16.GM Heritage factory kit — 1985 Chevrolet Suburban, p.15.GM Heritage factory kit — 1986 Chevrolet Suburban, p.15.GM Heritage factory kit — 1987 Chevrolet Suburban, p.21.GM Heritage factory kit — 1988 Chevrolet Suburban, p.15.GM Heritage factory kit — 1989 Chevrolet Suburban, p.14.
- GM Heritage factory kit — 1995 Chevrolet Tahoe, p.4.GM Heritage factory kit — 1996 Chevrolet Tahoe, p.18.GM Heritage factory kit — 1997 Chevrolet Tahoe, p.12.GM Heritage factory kit — 1998 Chevrolet Tahoe, p.40.GM Heritage factory kit — 1999 Chevrolet Tahoe, p.12.
- GM Heritage factory kit — 2003 Chevrolet Tahoe, p.134.GM Heritage factory kit — 2005 Chevrolet Tahoe, p.134.GM Heritage factory kit — 2006 Chevrolet Tahoe, p.120.
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The 2014 guides word it as emissions, California state requirements. Trim marks in the 2014 guides: Police: O; Special Service: O.
GM Heritage factory kit — 2007 Chevrolet Tahoe, p.150, p.160.
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A on all trims; 2018–2019 from GM's 2018 and 2019 Tahoe order guides (GM Authority copies)
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; all trims: O
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the service lists do not print it
GM Heritage factory kit — 2003 Chevrolet Trailblazer, p.123.GM Heritage factory kit — 2005 Chevrolet Trailblazer, p.118.GM Heritage factory kit — 2006 Chevrolet Trailblazer, p.133.GM Heritage factory kit — 2007 Chevrolet Trailblazer, p.134.
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the 2015 guide reads California state emissions requirements.
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; all trims: O
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; O on all trims
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; all trims: O
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all trims: O
- GM Heritage factory kit — 1997 Chevrolet Venture, p.45.GM Heritage factory kit — 2003 Chevrolet Venture, p.100.GM Heritage factory kit — 2005 Chevrolet Venture, p.97.
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O
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LT, Premier: O
This page aggregates every documented appearance of YF5 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.