How to Modify a Car to Avoid Failing the Vehicle Inspection?

how to modify car to pass inspection
Latest update date: February 17, 01

Car modification is the process of changing, upgrading or customizing parts of a car to improve the performance, aesthetics or function of the car. However, arbitrarily changing the structure of the car without complying with regulations not only causes safety risks but also makes it difficult for you to get registered.

According to Circular 43/2023, car owners can customize their cars by changing the headlights, adding a roof, or even changing the design and structure of the cargo box. But all changes must strictly comply with technical standards and use genuine spare parts to ensure safety and quality.

Do you want to modify your car without having trouble with vehicle inspection? Carefully study the relevant regulations, choose a reputable garage, complete all procedures, check the car and keep the documents carefully. Because the vehicle inspection process after modification requires careful preparation of documents, technical inspection of the car and readiness to fix minor errors (if any).

According to statistics from the Vietnam Register, in 2022, up to 15% of vehicles that were registered were rejected due to violations of vehicle modification regulations. This number shows the importance of understanding and complying with regulations when modifying vehicles.

By mastering the knowledge and following the correct procedures, you not only avoid the risk of failing the vehicle inspection but also ensure the safety of yourself and other road users. Let's learn the details to turn your passion for car modification into reality legally and safely.

how to modify car to pass inspection
How to modify a car without failing the vehicle inspection?

Why Does Car Modification Fail Vehicle Inspection?

The cause may come from not complying with current regulations, making common mistakes in the process of vehicle modification leading to consequences of failing the vehicle inspection, being dangerous when participating in traffic or not being insured.

1. Regulations on car modification in Vietnam

To avoid trouble when participating in traffic and when registering, you need to clearly understand the legal regulations on vehicle modification in Vietnam. Specifically:

  • Road Traffic Law 2008 (amended and supplemented in 2019): General regulations on arbitrary changes to the structure, assembly, and system of vehicles. Regulations on administrative sanctions for violations in the field of road traffic.
  • Decree 100/2019/ND-CP clearly stipulates violations of arbitrary changes to the structure, components, and systems of vehicles. Accordingly, vehicle owners are only allowed to change the paint color, install additional parts and equipment according to regulations and must be accepted and certified by a competent authority.
  • Circular 43/2023 amends and supplements Circular 85/2014 regulating the renovation of road motor vehicles, creating many conveniences for people and businesses.
  • Circular 55/2015/TT-BGTVT provides detailed instructions on the installation of additional accessories for motor vehicles. For example, for cars, you are allowed to install additional front/rear bumpers and roof racks, but must ensure that the size, weight and installation location comply with technical standards.
  • Circular 02/2017/TT-BCA: Regulations on vehicle registration.
  • National Technical Regulations (QCVN) on motor vehicles: Specific regulations on technical standards of motor vehicles participating in traffic, including detailed specifications.

2. Common mistakes when modifying a car

In fact, many cases of vehicle modifications are refused registration due to violations of regulations. Some common errors are changes to the chassis structure, steering system, headlights, exhaust system, and changes to vehicle size. Specifically:

  • Changing the chassis structure and steering system: Changing the chassis structure and steering system (steering angle, suspension system, etc.) can seriously affect the vehicle's performance and stability, especially at high speeds.
  • Incorrect lighting level: Headlights that are too bright, dazzling, or using the wrong type of LED lights or installing them in the wrong position can be dangerous for oncoming traffic. According to QCVN 35:2017/BGTVT, the maximum light intensity of headlights must not exceed 225.000 cd, and low beams must not exceed 1.200 cd.
  • Changing the exhaust system (muffler) does not ensure emission standards: Modifying the exhaust system not only causes noise pollution but can also change the engine structure, increasing the amount of toxic emissions into the environment. According to QCVN 86:2015/BGTVT, the maximum allowable noise level for motorbikes is 77 dB(A), for cars is 74dB(A).
  • Arbitrarily changing the size of wheels and tires: Changing the size of wheels and tires that do not meet technical specifications can affect the braking system and suspension system, causing unsafe operation. According to Circular 55/2015/TT-BGTVT, tire size must be in accordance with the manufacturer's technical specifications, with an allowable error of no more than ±3%.
- How to Modify a Car to Avoid Failing the Vehicle Inspection?
Improper lighting is one of the basic car tuning errors.

3. Consequences of improper vehicle modification

Improper vehicle modifications not only cause you trouble when registering your vehicle, but can also lead to more serious consequences such as administrative fines, traffic hazards, or invalidation of vehicle insurance.

Administrative penalties: Decree 168/2024/ND-CP, effective from 2025, stipulates the penalty for arbitrarily changing the frame, engine, shape, size, and characteristics of a vehicle (vehicle modification). Specifically:

Fine from 6.000.000 - 4.000.000 VND (for individuals). And 8.000.000 - 12.000.000 VND (for organizations) when violating one of the following acts:

  • Arbitrarily changing the vehicle's chassis or engine assembly. Arbitrarily changing the transmission system, braking system and motion system.
  • Arbitrarily changing the structure, size, or shape of the vehicle other than the manufacturer's design. Or designs that have been registered with the vehicle registration authority. Or modified designs approved by the competent authority.

Fine from 2.000.000 - 4.000.000 VND (for individuals) and 4.000.000 - 8.000.000 VND (for organizations) when:

  • Arbitrarily cutting, welding or re-punching the vehicle's chassis number or engine number.
  • Using vehicles with cut, welded or re-punched chassis numbers or engine numbers that are against traffic regulations.

Fines from 300.000 - 400.000 VND (for individuals) and 400.000 - 800.000 VND (for organizations) in case of arbitrarily changing the paint color, not matching the paint color of the previously registered vehicle.

  • Causing traffic insecurity: Modified vehicles that do not meet technical standards may have problems when operating, potentially causing traffic accidents for you and those around you.
  • Vehicle insurance void: In the event of an accident, if the authorities determine that the cause is due to structural changes to the vehicle, your insurance coverage may be denied.
- How to Modify a Car to Avoid Failing the Vehicle Inspection?
Illegal car modifications can result in fines, causing traffic safety and invalidating car insurance.

Which Parts of the Car Are Allowed to Be Modified?

Based on specific regulations, the vehicle parts that are allowed to be modified include: lighting clusters, cargo compartment covers, styling changes, adding a wind hood, changing the doors, changing the structure of the cargo box and body parts and details. These changes must ensure technical standards and be selected from genuine spare parts.

1. Specific regulations for each vehicle category

Circular 43/2023 clearly stipulates cases where motor vehicles have changes but are not considered as renovations. Specifically as follows:

  • Replace the front light assembly with a certified or declared compliant assembly.
  • Replace the bulb in the front light cluster with another type of bulb with equivalent power consumption without having to intervene or change the structure of the light cluster.
  • Install additional separate fog lights.
  • Install, replace or remove the cover for the cargo compartment and luggage of the PICKUP car without changing the size of the cargo bed and the size of the vehicle.
  • Change the design of some details of the car body such as: front grille, spoiler.
  • Install additional windshield on the truck cabin roof, steps, exhaust pipe decoration, decorative belt to protect headlights and signal lights without changing the exterior size of the vehicle.
  • Change of passenger compartment door (excluding change of door position and size).
  • Change some cargo container structures such as: sealing or changing the cargo container door structure, replacing flat sheet metal with corrugated sheet metal or vice versa, adding sheet metal to the roof frame of covered vehicles, adding or removing dust covers for the cargo container of dump trucks.
  • Changing the details and body parts is the vehicle manufacturer's option but does not change the vehicle's exterior dimensions, except for the cases specified in Article 6 of this Circular. Installation is carried out according to the recommendations of the vehicle manufacturer or the vehicle manufacturer's legally authorized representative.

The above cases are still subject to technical safety and environmental protection inspection of road motor vehicles to be granted Inspection Certificates and Inspection Stamps.

In other cases of change, a design file for the modified motor vehicle must be prepared for appraisal by the Vietnam Register or the Department of Transport. If the requirements are met, the design will be approved and a Certificate of Appraisal of the Modified Motor Vehicle Design will be issued according to the prescribed form.

- How to Modify a Car to Avoid Failing the Vehicle Inspection?
Can change details on the car body

2. Technical standards when modifying cars

Comply with technical safety, emission and noise standards to ensure safety and avoid rejection during vehicle inspection.

  • Technical safety standards: Modified details must ensure that they do not affect the vehicle's load-bearing structure, brake system, steering system, suspension system, etc.
  • Emission standards: The modified vehicle must meet emission standards as prescribed.
  • Noise standard: The noise level of the vehicle after modification must not exceed the permissible limit.

3. Experience in choosing spare parts when modifying a car

Car tuning parts should be prioritized as genuine, OEM or reputable aftermarket parts and have been thoroughly inspected before purchase. Using poor quality parts not only causes quick damage but also poses a potential safety risk when the vehicle is in operation.

  • Priority for genuine spare parts: Genuine spare parts are manufactured according to the manufacturer's standards, ensuring quality and compatibility with the vehicle.
  • Choose reputable OEM or aftermarket parts: If the cost of genuine parts is too high, you can choose OEM (Original Equipment Manufacturer) parts or aftermarket parts from reputable brands.
  • Check carefully before buying: You should buy spare parts at reputable stores and dealers with warranty. Check carefully the label, packaging, and origin before buying.

How to Modify a Car to Avoid Failing Vehicle Inspection?

To successfully modify your car, you need to follow these steps: learn the law, choose a reputable garage, complete the paperwork, inspect the car, and keep the paperwork carefully.

1. Learn the rules and regulations carefully

Before deciding to modify any part of your car, take the time to carefully study the laws and regulations on vehicle modification in Vietnam. You can refer to information on the website of the Vietnam Register, reputable car and motorbike forums, or contact the registration agency directly for answers.

2. Choose a reputable car tuning facility

You should choose reputable, experienced, and highly rated car tuning establishments. A professional car tuning establishment will advise you on car tuning solutions that suit your needs and purposes, while ensuring compliance with legal regulations.

Criteria for choosing a car tuning facility:

  • Valid business license.
  • Certification from automotive associations (eg VAMA certification).
  • Team of technicians with practice certificates.
  • Modern equipment and technology.
  • Customer reviews (minimum 4/5 stars on Google Review).

According to VAMA statistics, up to 40% of vehicle inspection failures are due to choosing an unreliable vehicle modification facility.

3. Procedures for applying for a vehicle modification license

For modifications that change the vehicle structure, you need to apply for a vehicle modification license from the competent authority. The application includes:

  • Vehicle registration certificate.
  • Vehicle owner's ID card.
  • Detailed technical drawings of the car.
  • Documents proving the origin of replacement parts.

After the authorities have assessed and granted a license, you are allowed to proceed with the vehicle modification.

4. Check and accept the vehicle after modification

After completing the car modification, ask the car modification facility to provide full documents certifying the quality and origin of the replacement parts. At the same time, you should bring the car to the inspection center to check and accept the entire brake system, lights, exhaust, etc. before participating in traffic.

According to the Vietnam Register, 85% of vehicles that have passed a thorough inspection will pass the registration smoothly.

5. Keep vehicle documents and valid vehicle modification certificates

Always carry all vehicle documents and valid vehicle registration certificates when participating in traffic and when registering for inspection. This helps you avoid unnecessary trouble with the authorities.

Vehicle Inspection Process After Modification

The process of vehicle inspection after modification includes preparing all documents, thoroughly checking the vehicle and fixing minor errors before completing the procedure with the inspection staff.

1. Prepare vehicle documents and full vehicle modification certificate

Preparing complete documents is the first and most important step in the vehicle inspection process.

According to the latest regulations of the Vietnam Register, you need to prepare:

  • Vehicle registration: Original, valid.
  • Vehicle owner's ID card: Original or notarized copy.
  • Vehicle modification certificate (if any): Issued by competent authority.
  • Documents proving the origin of replacement parts (if any): Invoice, valid purchase documents.

2. Check the vehicle's technical condition before registering.

Before taking your car for inspection, you should check it yourself or take it to a garage to check technical details such as:

  • Brake system: Ensures effective braking without misalignment.
  • Lighting system: Make sure all lights (headlights, low beams, turn signals, brake lights, etc.) work well, are bright enough, and are not burnt out or dim.
  • Steering system: Ensure light steering, precise steering response, no shaking.
  • Suspension system: Check the elasticity of shock absorbers and springs to ensure smooth vehicle operation.
  • Emissions: Ensure engine emissions meet permitted standards.

3. Fix minor errors before going for inspection

If you find that your car has minor problems such as burnt-out turn signals, the horn not working, or misaligned rearview mirrors, you should fix them yourself or take them to a garage for repair before registering.

4. Notes when working with inspection staff

For the inspection process to go smoothly, you should cooperate, carefully observe the inspection process and politely discuss any questions or complaints.

  • Cooperate and provide full information and documents as requested by the inspection staff. Clearly present the changes made to the vehicle to the staff.
  • Carefully observe the vehicle inspection process of the inspection staff. Record the comments and suggestions of the inspection staff.
  • If you have any questions or complaints, please politely discuss them with the inspection staff or contact the management department of the inspection center.

According to the Vietnam Register, 85% of complaints about vehicle inspection results are resolved satisfactorily when vehicle owners cooperate well and communicate politely with vehicle inspection staff.

Frequently Asked Questions About Vehicle Modifications To Avoid Failing Vehicle Inspection

1. Does car modification affect car insurance?

Modifying your vehicle may affect your insurance benefits. In the event of an accident, if the authorities determine that the vehicle has been structurally altered without permission, your insurance claim may be denied.

Therefore, you should notify the insurance company of any changes to the vehicle after modification and ensure that the modification complies with legal regulations.

2. What are the popular car tuning trends today and how do you rate their safety level?

Currently, the trend of car tuning focuses on upgrading the lighting system, sound, entertainment screen, heat-insulating film... These tuning details have little effect on the car's structure, however, you still need to choose quality spare parts and install them at reputable establishments to ensure safety.

3. How to customize your car uniquely and safely?

Experience custom cars unique, safe:

  • Focus on the small details: Change details like lights, grille, rims.
  • Interior Upgrades: Changing the seats, steering wheel, or sound system can provide a unique and more comfortable driving experience.
  • Add accents with decals: This beauty trick can make a big difference without compromising safety.

4. What should you note when upgrading the electric folding rearview mirror of a car?

Electric folding rearview mirror for cars Please note the following 3 things:

  • Choose the right type of electric folding mirror including electric mirrors for cars with motors and electric mirrors for cars without motors.
  • Installation of electric rearview mirrors takes about 3-4 hours, ranging from 1,5 to 3 million VND.
  • Electric folding mirrors do not harm the car, but should be adjusted by an experienced technician to ensure compatibility with the car's structure.

5. Can the engine power of the car be increased?

Modifying the engine capacity of a vehicle is one of the most complicated changes and is generally not recommended. According to regulations, if the vehicle owner wants to change the engine capacity, he must request permission and re-register the vehicle as a new vehicle, through a strict inspection process.

6. What is the average time to complete the vehicle modification license application process?

Typically, the process of applying for a vehicle modification license takes 5-7 business days. However, the time may be extended if the application is incomplete or requires additional information. According to statistics, 70% of applications are processed within this time frame.

7. Does car tuning reduce the resale value of the car?

This depends on the quality and legality of the modification. Professional and legal modifications can increase the value of a car by 10-15%. Conversely, poor quality or illegal modifications can reduce the value of a car by 20-30%.

8. Are there any regulations on vehicle modifications for people with disabilities?

Yes. Vehicle modifications for the disabled are encouraged and have some incentives. According to Circular 46/2014/TT-BGTVT, the installation of devices to assist the disabled on vehicles is exempt from appraisal and certification fees. However, the changes must still ensure technical safety and be inspected by competent authorities. Read the article now: Regulations on penalties for arbitrarily modifying cars according to the latest law.

9. Where is a reputable and professional car maintenance, repair and beauty address in HCM?

With over 10 years of experience, Thanh Phong Auto stands out as one of the leading units in the field of car care and beauty in Ho Chi Minh City. The unit has affirmed its position thanks to the quality of professional services and reputation in the automotive industry.

Gathering a team of excellent engineers and technicians, not only with a solid academic background but also with many years of experience, ensuring quality and professional car care, maintenance, and tuning.

- How to Modify a Car to Avoid Failing the Vehicle Inspection?
Professional and cheap car care and beauty address in HCM

Advantages of using the service at Thanh Phong Auto:

  • High expertise: Proficient in handling mid-range and high-end cars such as Toyota, Lexus, Acura, Mercedes, BMW, Audi.
  • Dedicated consulting: Help customers upgrade and beautify their cars according to regulations, ensuring they do not fail the vehicle inspection.
  • Professional process: Apply international standards in all services.
  • Quality commitment: Money back if service does not meet requirements.

With the combination of experienced staff, modern facilities and commitment to service quality, Thanh Phong Auto has become a trusted destination for car owners who want to upgrade, maintain and beautify their cars according to regulations in Ho Chi Minh City.

Hopefully, with the information provided in this article, you have a clear understanding of the regulations on car modification to avoid failing the vehicle inspection. Good luck.

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