REG 139 Form – Are you buying or selling a vehicle in California and need to handle smog certification paperwork? The REG 139 form, officially known as the Vehicle Emission System Statement (Smog), is a required document for many private vehicle transfers. This guide explains everything about the REG 139 form, including its purpose, when it’s required, how to complete it, and where to download the official REG 139 PDF directly from the California DMV.
What Is the REG 139 Form?
The REG 139 form is the Vehicle Emission System Statement (Smog) issued by the California Department of Motor Vehicles (DMV). It is a legal agreement between the buyer (transferee) and seller (transferor) of a vehicle regarding existing smog certification and the condition of the vehicle’s emission control system.
Revised in May 2007 (REG 139 ENG R5 2007), this one-page form references California Vehicle Code Section 5751.5. It is not submitted to the DMV — it stays between the buyer and seller for their records only.
Purpose of the REG 139 Vehicle Emission System Statement
The primary purpose of the REG 139 form is to protect both parties during a vehicle transfer when a valid smog certification (Certificate of Compliance) was obtained within the last 90 days but not specifically for this sale.
It informs the buyer that:
- No new smog inspection is required for registration if the transfer happens within the 90-day validity window.
- The vehicle may still not meet current emission standards at the time of purchase.
The form also includes the seller’s certification (under penalty of perjury) that they have not modified — and have no knowledge of anyone else modifying — the vehicle’s emission system in a way that would cause it to fail a smog test under Health and Safety Code Section 44015.
When Is the REG 139 Form Required?
You need the REG 139 form in these situations:
- The vehicle is being sold or transferred.
- A smog certification was completed within the past 90 days (but not for this specific transfer).
- The vehicle is subject to California smog requirements (generally 1976 and newer gasoline vehicles or 1998 and newer diesel vehicles).
Exceptions (no REG 139 needed):
- Vehicles less than 4 model years old.
- Transfers to immediate family members (spouse, domestic partner, child, parent, etc.).
- Certain exemptions listed on the DMV smog inspections page.
Private sellers must provide this statement to the buyer when submitting the transfer application to the DMV.
How to Complete the REG 139 Form Step by Step?
Filling out the REG 139 PDF is straightforward:
- Vehicle Information — Enter the vehicle’s make, Vehicle Identification Number (VIN), and license plate number.
- Seller (Transferor) Section — The seller prints their name, signs, and dates the form. They certify under penalty of perjury that the emission system has not been tampered with.
- Buyer (Transferee) Section — The buyer prints their name, signs, and dates the form. They acknowledge the warning about potential non-compliance and their rights regarding a pre-purchase smog test.
- Keep for Records — Both parties keep a copy. Do not mail this form to the DMV.
The form clearly outlines the buyer’s option to have the vehicle tested before the sale. If it fails, the seller must pay for repairs to bring it into compliance.
Download the Official REG 139 PDF
Get the most current and official version directly from the California DMV:
Official Download Link:
REG 139 Vehicle Emission System Statement (Smog) PDF
This is the exact file hosted on the DMV website (uploaded October 2024). Always download from dmv.ca.gov to ensure you have the authentic, up-to-date document.
Key Sections of the REG 139 Smog Form
- Warning to the Buyer — Explains the 90-day smog validity and that the vehicle may not currently comply with emission standards.
- Buyer’s Rights — Option to test the vehicle before purchase; seller must reimburse and repair if it fails.
- Seller’s Certification — Penalty-of-perjury statement regarding no emission system modifications.
- Signatures and Dates — Required from both buyer and seller.
Buyer and Seller Responsibilities Under REG 139
Seller Responsibilities:
- Provide the completed REG 139 form to the buyer.
- Certify the emission system has not been tampered with.
- Pay for repairs and reimburse the buyer if the vehicle fails a pre-sale smog test.
Buyer Responsibilities:
- Acknowledge the warning and understand no new smog is required within 90 days.
- Decide whether to test the vehicle before finalizing the purchase.
This form helps prevent disputes and ensures transparency during California vehicle transfers.
Frequently Asked Questions About REG 139 Form
Is REG 139 the same as a smog certificate?
No. A smog certificate is issued by a licensed smog station after inspection. REG 139 is a statement about an existing recent smog certificate.
Do I need to submit REG 139 to the DMV?
No. It is kept between buyer and seller only.
Where can I find more information?
Visit the official California DMV forms page or the Smog Inspections section on dmv.ca.gov for the latest requirements.
Is the form still current in 2026?
Yes. The DMV continues to list and provide the REG 139 (REV. 5/2007) as the official form on its website.
Why the REG 139 Form Matters for California Vehicle Transfers?
Whether you’re a private seller or buyer, the REG 139 form ensures compliance with California’s strict smog laws while protecting your rights. Using the official REG 139 PDF from the DMV helps avoid delays in title transfer and registration.
Tip: Always download the latest version from the official DMV link provided above and consult a licensed smog station or the DMV if your situation is unique.
For the most accurate and up-to-date information, refer directly to the California DMV website. Safe driving!