What is the emission standard for 2006 vehicles?
3 Answers
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.
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.
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.
