CARB Executive Orders: Selling Intakes, Tuners and Headers on Amazon

A cold air intake, a set of headers, a handheld tuner. Three of the best-selling product types in Amazon's Automotive category, and three products that cannot lawfully be advertised for use in California without a piece of paper from the California Air Resources Board. Most sellers know the term "CARB EO" from a competitor's bullet. Fewer know what the Executive Order actually covers, what the number looks like, what it means for shipments outside California, and why a disclaimer does not stand in for one. This post walks through the regime the way the rule set for this category applies it.

The rule: no EO, no California

California Code of Regulations title 13, section 2222(b) (13 CCR 2222) says that no add-on or modified part that affects vehicle emissions may be sold, offered for sale or advertised for use on a vehicle in California unless CARB has issued an Executive Order exempting it. The verbs matter. "Advertised for use" means a listing that is visible to a California shopper and does not exclude California is already inside the rule, before a unit ships. Amazon enforces its end by blocking non-CARB emissions parts from shipping to California addresses and treating them as restricted products.

The EO is CARB's finding that the part, as tested on the named vehicles, does not increase emissions. It is specific to part numbers and vehicle applications. An EO covering your intake on a 3.6 L Wrangler does not cover the same intake on a 2.0 L turbo.

Which parts affect emissions

The rule set treats the following as emissions-related and expects an EO or a California exclusion on each: intakes (cold air, short ram, intake kits), headers, turbocharger and supercharger kits, tuners, programmers, flash tuners and performance chips or modules, camshafts and cam kits, throttle bodies and intake manifolds, high-flow catalytic converters, EGR coolers and PCV components, and any exhaust system that replaces or relocates a catalyst or other emission control. A cat-back exhaust that leaves the converter in place does not need an EO on emissions grounds, though motorcycle replacement systems carry a separate EPA noise label requirement under 40 CFR 205.

Parts that do not touch the emission system (interior trim, lighting, suspension, brakes) are outside the rule, even if a word like "header" appears in a different sense.

The number and how to state it

CARB EOs for aftermarket parts are numbered D-xxx-xx. CARB publishes the list on its aftermarket parts page, so a number can be checked by anyone, including Amazon and a competitor filing a complaint. Copy it from the EO letter exactly. The rule set runs a format check on every EO cited in a listing: a number that does not match the pattern cannot be verified and cannot support a "CARB compliant" or "50-state legal" claim.

Two phrases to be careful with:

• "CARB approved" or "CARB certified". CARB exempts parts from the anti-tampering law by Executive Order. "CARB exempt, EO D-xxx-xx" is the precise form. "CARB compliant" is tolerated as long as the number follows it.
• "50-state legal". For an emissions part this means one thing: an EO is held. Without the number, it is an unsupported legality claim.

The two compliant states of a listing

An emissions-related listing passes in one of two states:

1. It states the EO number (D-xxx-xx) and may say "50-state legal" or "CARB exempt".
2. It states clearly that the part is not legal for sale or use in California or on pollution-controlled vehicles, and the seller excludes California from shipping.

A listing that does neither, for example "Cold air intake for 2018-2023 Jeep Wrangler JL 3.6L. Adds 12 HP. Easy install.", fails. It is advertising an emissions part for a road vehicle with no exemption and no exclusion. (The "+12 HP" is a separate substantiation problem, covered in our guide to performance and fitment claims.)

The second state is legitimate for race parts, but read the off-road section before relying on it.

Outside California, the Clean Air Act still applies. EPA's position, set out in its November 2020 Tampering Policy and summarised on its air enforcement page, is that a seller of an aftermarket part that could affect emissions should have a documented reasonable basis for believing the part does not increase emissions. A CARB EO is the most common reasonable basis. EPA certification or emissions testing to an accepted protocol are the others. In practice an EO does double duty: it opens California and it documents your basis for the other 49 states.

Defeat devices and the off-road disclaimer

A separate group of products will never receive an Executive Order because their purpose is to remove an emission control. Section 203(a)(3)(B) of the Clean Air Act (42 USC 7522) prohibits manufacturing, selling or installing any part whose principal effect is to bypass, defeat or render inoperative an emission control device. The rule set treats these as do-not-sell when the listing has road-vehicle fitment:

• EGR delete, block-off or bypass kits
• DPF delete or removal
• DEF, SCR or AdBlue delete kits and emulators
• Catalyst delete, test pipes, straight pipes
• Oxygen sensor simulators, spacers and eliminators
• Race, delete or "off-road" tunes that disable emission controls
• MIL or check-engine-light eliminators

Amazon lists emissions defeat products, oxygen-sensor simulators and malfunction-indicator override products among its restricted products in Automotive and removes the listings. There is no compliant wording for these. The only fix is to stop marketing them for road vehicles.

Which brings up "off-road use only". The disclaimer appears on most of the listings above, and on a good share of intakes and headers that simply lack an EO. It does not work when the product is marketed by year, make and model for a car, truck or street motorcycle. NHTSA and EPA both look at what the part is sold to fit. "Race header for 2015-2020 Mustang GT, competition use only" is a part marketed for a road vehicle; the disclaimer is noted and disregarded. The rule set flags the combination of an off-road disclaimer and road-vehicle fitment for review on exactly that basis. For a UTV light bar or a dirt-bike exhaust the disclaimer is unremarkable, because the vehicle is genuinely off-road. The same reasoning drives Amazon's removal of LED headlight conversion kits regardless of any off-road note.

Catalytic converters: four states and a warranty

Aftermarket converters have their own layer. Under EPA's aftermarket converter policy (51 FR 28114, see EPA's converter page), an EPA-compliant converter is labelled with a code in the form N/XX/YYYY/ZZZZ, carries a warranty of 5 years or 50,000 miles on the shell and end pipes and 25,000 miles on emissions performance, and may be installed only where the original is missing, has failed an inspection or the vehicle is out of its emissions warranty, documented on the installer's invoice.

CARB-certified converters (with an EO) are required in four states: California, New York, Maine and Colorado. A converter listing without an EO therefore needs to say it is not legal for sale or use in all four, state the EPA warranty and state the installation conditions. "Not for California" alone is incomplete. A converter with an EO can say "legal in all 50 states" and skip the exclusion.

Keep the records

Section 2222(f) requires retailers to keep records of each sale of a non-exempt emissions-related part sold in California for four years. If you sell such parts and ship to California at all, the records duty attaches. Combined with Amazon's own document requests, the file for an emissions part should contain:

• The CARB Executive Order letter naming your part numbers and vehicles
• The fitment data (ACES) behind the vehicles you list
• Sale records for California, four years
• For converters, the EPA label code and the written warranty terms

The full list of documents expected per part type is on the automotive category page.

Doing this across a catalogue

One EO letter per part is manageable. The failure mode is scale: a 400-ASIN performance catalogue where half the intakes cite the EO, a quarter cite a number copied from a sister part that does not cover them, and the rest say "off-road use only" and ship to Sacramento. Reading each listing against its EO letter and fitment is the job Verid8 automates: it identifies which listings are emissions-related, checks each EO number's format against CARB's pattern, flags missing California exclusions and defeat-device wording, and tracks the EO letters and sale records as documents against the listing. You can run one listing through it free.