The implementation of stricter vehicle emission inspection regulations has begun influencing buying behaviour in the used car market, with early signs of slower transactions emerging in Vietnam.

Tightened registration rules and new automobile emission inspection regulations that came into effect on March 1st, 2026, have contributed to a decline in customer activity, particularly for diesel-engine vehicles, as buyers have become more cautious due to concerns about inspection risks.

A survey conducted by reporters at several used car dealerships in Hanoi in recent days indicates that trading activity has slowed compared with the period before Tet. At a showroom on Nguyen Van Cu Street (Long Bien, Hanoi), many diesel pickup trucks and SUVs that are 10-15 years old remain parked in the lot even though they have been listed for sale for weeks.

A local owner of a used car dealership in the area, confirmed that the number of customers enquiring about diesel vehicles has declined.

"In general, the used car market always slows down after Tet, but this year it has become more difficult. With the news about stricter emissions inspections for diesel vehicles, which require pressing the accelerator fully for testing, people have become more hesitant to buy," the owner said.

"We imported diesel pickup trucks and SUVs, but they have still not been sold, while we continue to bear costs such as rent and loan interest. We have been in this business for years, but the market has rarely been this quiet," he further added.

At another used car dealership on Tran Thai Tong Street (Cau Giay, Hanoi), the situation is similar. The owner stated that recently fewer customers have come to view vehicles, particularly older diesel models.

"A few days ago, a customer from Dong Anh placed a deposit of VND 10 million (US$ 381) to buy a 2019 Toyota Fortuner diesel from our store for nearly VND 900 million. Both sides had almost finalised the deal and were only waiting for the ownership transfer date. However, the customer later called back to withdraw the deposit after hearing discussions about stricter emissions inspections for diesel vehicles, which require pressing the accelerator fully to the floor during testing," he said.

He further added: "The customer said they were worried about potential problems during future inspections and possible repair costs, so they decided to stop. Cases like this have occurred recently. Many people who intend to buy remain hesitant because they are concerned about the new regulations."

"Some customers come to buy cars but remain uncertain. They ask about the engine condition and the emissions system, and also enquire whether the fuel injectors have been repaired before, as they are concerned that problems may arise during inspections after purchasing the vehicle," he said.

According to used car traders, sales of diesel vehicles have declined in recent weeks compared with the period before Tet and are also lower than the same period in 2025. Older diesel pickup trucks and SUVs are taking longer to find buyers.

Another local who specialises in selling classic cars in Hanoi, said that stricter inspections would have short-term impacts on both vehicle owners and used car dealers.

"Car owners may have to repair or upgrade their vehicles to meet inspection standards, or sell their cars earlier in order to switch to newer models. Used car traders are also affected because customers have become more cautious when purchasing vehicles," the local said.

Buyers shift toward newer and greener vehicles

According to used car dealers, the tightening of emissions inspection standards could lead to clearer segmentation within the used car market.

Duc said older diesel models may face difficulty in finding buyers, while newer vehicles with clear maintenance histories may continue to attract interest. Buyers may choose newer vehicles to reduce the risk of failing inspections.

Many people purchase diesel vehicles for long-distance travel or transport, so demand remains. However, in order to reduce inspection risks, some buyers are considering switching to newer models or vehicles powered by petrol, hybrid systems, or electricity.

This shift is becoming more visible in inner-city areas. Urban users are showing greater interest in electric vehicles or small petrol cars because they are easier to use in cities and involve fewer concerns regarding emissions standards.

Meanwhile, in suburban areas or localities where long-distance travel or goods transport is required, diesel vehicles remain in use due to their towing capability and fuel efficiency on long journeys.