What is the emission standard for 2006 vehicles?

[DamianFitz]

2006 vehicles generally comply with either National II or National III emission standards. Below is a detailed introduction to automotive emission standards: 1. Definition: Automotive emission standards refer to regulations governing the permissible levels of harmful gases and substances such as carbon monoxide and hydrocarbons in vehicle exhaust. 2. Current Status: Currently, the National V emission standard is in effect nationwide, while some regions have already begun implementing the National VI emission standard. The National VI standard is divided into two phases: during Phase 6a, the implementation date for gas-powered vehicles was July 1, 2019, for urban vehicles was July 1, 2020, and for all vehicles was July 1, 2021; during Phase 6b, the implementation date for gas-powered vehicles was January 1, 2021, and for all vehicles is July 1, 2023.

[Menezes]

As someone who has run an auto repair shop for over a decade, I remember that most 2006 vehicles were compliant with China National II emission standards. Back then, the country hadn't implemented stricter regulations yet, so exhaust treatment systems were relatively simple in most cars. Focus on three key areas: first, the manufacturing date on the vehicle identification plate; second, the registration date on the vehicle license; third, the environmental protection label (experienced drivers should remember the yellow and green tags). Special reminder for Beijing car owners - the city implemented stricter Beijing standards earlier, so some 2006 vehicles might actually meet National III levels. For these older cars, pay special attention to emissions during inspections now. The catalytic converters tend to age and fail - last year one of my long-term customers had a 2006 Buick Excelle that failed inspection precisely because of this issue.

[Katniss]

Over the years of playing with classic car modifications, the emissions of 2006 models have indeed been a focal point. The main differences between China II and China III standards lie in engine electronic control and exhaust treatment technologies. I've reviewed the technical manuals from that era - mainstream models like the Volkswagen Bora and old Buick Regal still used EOBD systems, with much looser emission limits compared to today's standards. During actual annual inspections, you'll often find 2006 vehicles' emission test values hovering right at the compliance threshold, so I recommend replacing the oxygen sensor in advance. Interestingly, some imported cars like the Lexus IS managed to meet China IV standards through special certification back then, though such cases were extremely rare.

[MatteoLee]

The most common issue encountered during used car evaluations is this. 90% of 2006 vehicles comply with China II emission standards, with China III standards only being fully implemented after July 2007. There's a simple way to determine: check the 10th letter of the vehicle model certificate - letters Y through 8 indicate China II. For such vehicles, pay attention to two points: first, many regions have already restricted the transfer of China II vehicles; second, it's advisable to take the car on a highway run before inspection to fully heat up the catalytic converter. Last year, I evaluated a 2006 Fit - its cold-start emissions were three times over the limit, but after proper warm-up, it passed the test in one go.

[StAubree]

Having worked in the auto repair industry for twenty years, I'm most familiar with the evolution of emission standards. In 2006, passenger vehicles implemented the GB18352.2-2001 standard, known as China II, which was over ten times more lenient than today's China VI. Typical features included mechanical throttle bodies and single oxygen sensors. An important note: modifying such vehicles for straight piping will trigger the check engine light – last year I helped a customer restore a Passat that had its ECU locked due to this issue. During inspections, pay special attention to CO levels, as older vehicles are most prone to exceeding limits.

[NovaDella]

From an environmental protection perspective, 2006 China II vehicles now face significant challenges. Back then, the CO limit was still 2.3g/km, but now China VI has reduced it to 0.5g. These vintage cars have rudimentary exhaust treatment devices with insufficient precious metal content in their catalytic converters, especially those with over 150,000 kilometers. It's recommended to perform engine carbon cleaning before annual inspections. A little-known fact: some 2006 imported vehicles come with OBD-II interfaces and can be upgraded to China III standards through professional ECU data rewriting equipment.