Vehicle Modification Regulations

Vehicle modification regulations refer to the statutory laws, regulatory frameworks, and technical standards established to govern vehicle customisation, ensuring road traffic safety and environmental protection. In China, car modifications have long been restricted by stringent vehicle administrative controls. However, driven by the rising demand for personalised vehicle ownership and progressive policy easing, modification regulations are shifting from blanket bans to a categorised management system. In June 2026, nine government ministries and agencies, led by the Ministry of Commerce, jointly rolled out the "Notice on Several Measures to Cultivate and Expand Automotive Aftermarket Consumption". Widely regarded as the first national-level blueprint to systematically support the automotive aftermarket industry, it marks a pivotal transition towards standardised and regulated vehicle modification.

Scope of Permitted Modifications

Under prevailing regulations, the following modification items are generally permitted subject to official endorsement and registration:

Body colour changes: Vehicle body colours may be altered via vinyl wrapping or respraying, provided that livery schemes reserved for emergency and enforcement vehicles—such as police cars, fire engines, ambulances, and rescue units—are not used. Vehicle owners must apply for an update of vehicle registration details at the vehicle licensing office within 10 days of completion.

Rim replacement: The design and style of wheel rims may be changed, provided the original tyre size and specifications remain unaltered.

Roof racks: Passenger cars may be retrofitted with roof racks, provided the added height does not exceed 30 cm.

Side steps and bumpers: Side steps may be installed and front/rear bumpers replaced, provided the overall vehicle length, width, and structural integrity are not compromised.

Interior customisation: Upgrades to seats, steering wheels, and in-car audio systems that do not impair vehicle safety systems are generally unrestricted.

2026 New Policy: Tiered and Categorised Management

The joint ministerial notice issued in June 2026 represents the first comprehensive, nationwide strategy for the vehicle modification sector. The cornerstone of the policy is a "tiered and categorised management" framework, which classifies modification projects into three tiers based on safety risk levels:

Tier 1 (Minor Modifications): Permitted to be carried out directly by owners upon filing, covering low-risk items such as body colour changes and same-sized rim upgrades, with online registration supported. As these items have minimal safety impact, approval procedures are streamlined.

Tier 2 (Moderate Modifications): Requires an official safety inspection report from an accredited technical body prior to registration, covering functional upgrades such as brake system enhancements and certified suspension damper replacements.

Tier 3 (High-Risk Modifications): Strictly prohibited under all circumstances. This includes powertrain performance tuning, chassis and body structural modifications, as well as alterations to the electric powertrain systems (battery, motor, and control units) of new energy vehicles (NEVs), none of which will be accepted for registration.

This categorised framework replaces the previous rigid, "one-size-fits-all" restrictions, opening up legitimate aftermarket customisation opportunities whilst safeguarding core vehicle safety standards.

Strictly Prohibited Modification Items

The following modifications constitute illegal practices under all circumstances:

• Powertrain modifications: Unauthorised engine swaps, aftermarket turbocharger retrofits, ECU remapping/tuning for higher power outputs, and exhaust system alterations that breach statutory emission or noise limits

• Unauthorised chassis and suspension alterations: Lifting or lowering the vehicle ride height, and altering the suspension geometry or configuration

• Body structural alterations: Chopping the roof, lengthening the wheelbase, and modifying the core vehicle chassis frame

• Illegal lighting modifications: Installing strobe lights, HID/xenon bulbs without projector lenses, demon eye lights, and non-certified laser headlamps

• Removal or tampering with safety and emission systems: De-catting (removing catalytic converters), removing petrol/diesel particulate filters, and bypassing or spoofing on-board diagnostics (OBD) systems

Standard Procedures for Compliant Modifications

Compliant modifications generally follow a standard process: first, verify whether the intended modification is legally permitted; for modifications requiring endorsement, the owner must submit an application for particulars update at the vehicle licensing office within 10 days of completion, presenting the owner's identity card, vehicle registration document, and vehicle grant/ownership certificate, with the vehicle physically present for inspection; simple accessories such as compliant roof racks within prescribed dimensions can be installed directly without prior registration. For endorsed modifications, the photo on the vehicle registration document will be updated accordingly.

Enforcement and Compliance Inspections

Regulatory compliance for modified vehicles is monitored and enforced through several channels: during mandatory periodic vehicle safety inspections, the vehicle's exterior, lighting, and braking systems are cross-checked against official records, and non-compliant modifications will fail the inspection; during roadside enforcement operations, traffic police can stop visibly modified vehicles to verify whether the actual vehicle condition matches the registration record; during emissions testing, exhaust modifications resulting in excessive emissions will be penalised in accordance with the law. Enforcement authorities may order non-compliant vehicles to be restored to their original factory specifications and issue compound fines; in severe cases, the vehicle may be impounded until fully de-modified.

Industry Direction and Outlook

The 2026 policy framework explicitly encourages vehicle manufacturers and specialist modification firms to establish certified partnerships, promoting "factory-fitted customisation" and "OEM-certified modification" services. Modifications carried out by original vehicle manufacturers or their authorised modifiers come pre-registered from the factory with full documentation, eliminating subsequent vehicle transfer issues and offering consumers a reliable, hassle-free route to customisation. Concurrently, 40 pilot cities for automotive retail and aftermarket consumption reforms were announced, with Beijing's Chaoyang District, Tianjin, Guangzhou, and Hainan undertaking pilot initiatives covering vehicle customisation standards and NEV modification guidelines. The year 2026 is widely anticipated to mark the inaugural year of standardisation for China's vehicle modification industry.