Advice7 min read11 views
Updated 28 October 2026 · Written by the Wahanaya.lk team
Almost every petrol or diesel vehicle needs a valid VET certificate from Drive Green or LAUGFS Eco Sri before you can renew your revenue licence. Bring your CR/VIC, warm the engine first, and budget roughly Rs 640–2,540 depending on vehicle type.
The Vehicle Emission Test (VET) checks how much carbon monoxide, hydrocarbon or smoke your vehicle's exhaust is putting out, and you need a valid VET certificate before the RMV/DMT will issue or renew your annual revenue licence. In other words, no VET certificate usually means no revenue licence, and driving without a valid revenue licence is an offence. The test is run by two companies authorised by the Department of Motor Traffic (DMT): Drive Green (CleanCo Lanka Ltd) and LAUGFS Eco Sri. Both charge the same fees and run centres island-wide.
Almost every petrol or diesel-powered car, van, three-wheeler, motorcycle, lorry, bus and coach on the road needs a VET certificate once it's past its first revenue licence year. The main exemptions are brand-new vehicles (first year only), pure battery electric vehicles, vehicles manufactured before 1976, and vehicles that run only on LPG. Hybrids are commonly reported as exempt too, but the rule hasn't been consistent across sources, so check directly with Drive Green or Eco Sri for your specific model rather than assuming. If you're shopping for something that skips this hassle altogether, you can filter by fuel type when you browse vehicles for sale on Wahanaya.
Budget somewhere between Rs 640 (motorcycle) and Rs 2,540 (prime mover) depending on your vehicle category, based on Drive Green's October 2025 price list — car owners currently pay around Rs 1,690. The actual test itself is quick, usually a matter of minutes once you're at the front of the queue, but the queue itself can take longer at busy centres, especially close to your revenue licence renewal date. Because both authorised operators must charge the same fee under their DMT contract, you don't need to shop around for a cheaper price — the only real choice is which centre is more convenient.
Bring your vehicle along with the original CR (certificate of registration) or VIC (vehicle identity card). If the vehicle is on a lease, bring a certified copy of the CR or VIC from your leasing company instead, since the original is usually held by the leasing company until the lease is settled. If you're not sure where your vehicle's paperwork stands — for instance, after buying a used car privately — it's worth reading our guide on transferring ownership discussions in the forum, or asking there directly if something looks off.
Drive the vehicle for at least 25–30 minutes at a reasonable speed before the test so the engine reaches normal operating temperature — a cold engine is one of the most common, and most avoidable, reasons for a false fail. Check that your engine and chassis numbers are legible, the silencer has no holes or loose joints, there's no oil or water leakage, the fuel cap is in good condition, and fan belts aren't worn. For diesel vehicles, a dirty exhaust system with built-up carbon in the silencer is a frequent cause of failing the smoke test, so a service or exhaust clean beforehand can help. Keep the engine running while you queue, and switch off the air conditioning, lights, wipers and radio right before the test itself, since accessory load can skew the reading.
You get up to two free retests at the same centre within 60 days of the original test, so there's no need to pay twice if you can fix the issue quickly — commonly a clogged air filter, an oil leak, worn spark plugs, or a dirty exhaust. If it still fails after that, you'll likely need proper mechanical work (carburettor/injector tuning, exhaust repair, or an engine service) before trying again, and the clock on your revenue licence renewal keeps running regardless, so don't leave this until the last few days.
Drive Green and LAUGFS Eco Sri between them run well over a hundred fixed, semi-fixed and mobile testing stations across the country, so there's usually one reasonably close by in most districts. Drive Green offers online booking through its website and a hotline, which is worth using if you want to avoid a long queue, particularly in Colombo and other busy urban centres. If you're buying a vehicle and the seller claims it has a current VET certificate, it's reasonable to ask to see it alongside the CR — our safety tips page covers what else to check before you hand over any money.
As of October 2026, the DMT has publicly discussed plans — still under legal review — to bring in a separate mandatory roadworthiness or "fitness" test from early 2027, on top of the existing emission test, done at approved garages roughly every 5,000 km or three months. Nothing is finalised: which vehicle categories it will cover, and exactly how it will run, hasn't been announced. Don't plan around it yet, but don't be surprised if you start seeing more detail on this through 2027.
The most common mistake is turning up with a cold engine and failing a test that a warmed-up car would have passed easily. Second is leaving it to the last day or two before the revenue licence expires, so there's no time left for a retest if something goes wrong. Third is forgetting that a leased vehicle needs a certified copy of the CR/VIC from the leasing company, not the original, which the finance company usually keeps. Fourth, people assume a recently serviced vehicle will automatically pass — a clean engine bay doesn't fix a dirty exhaust system or worn spark plugs. And if you're buying a used vehicle, don't assume the VET certificate the seller shows you is current; check the date yourself, the same way you'd check the price is fair before agreeing to anything.
If you're not sure whether a vehicle you're about to buy or sell has its paperwork in order, ask in the Wahanaya forum — it's a quick way to get a second opinion from people who've dealt with the same centres and the same questions.
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