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What will happen to BS4 vehicles after BS6 Rollout?

The tables will turn after the 1st of April as new BS6 exhaust emission norms for the vehicles on road are rolling out. To bring down the pollution emitted from the exhaust of the vehicles on the road, the government skipped BS5 in between BS4 and came with BS6 instead.

BS4 car discounts to be lowered
BS4 cars

Read more: Will BS6 fuel be expensive than BS4 fuel? as new norms come into play

The changes in the emission norms from BS4 to BS6 are huge. The numeric value for the harmful gasses from the exhaust has drastically come down. This is lead every automobile manufacturer in India to work their heel and toe in achieving the new BS6 norms.

The change led to many questions arising in the consumer’s head. Let’s see one of such questions.

What will happen to BS4 vehicles after 2020?

BS4 Vehicles | Fairly Non-polluting

BS4 implemented after 7 years in April 2017, started the journey of fairly less polluting vehicles. Many small changes in the vehicles were made to make them BS4 compliant. The changes include.

  • Open-loop ECU became closed-loop ECU in two-wheelers.
  • The catalytic converters became more efficient in breaking down pollution.

There were no extra noticeable changes when coming from BS3 to BS4.

Maruti Suzuki Ciaz | BS6 Cars To Buy
Maruti Suzuki Ciaz | BS6 Car

BS6 Vehicles | Even less, Non-Polluting

The growing pollution forced the Indian government to skip a ladder in between and jump straight to BS6. The new norms have dropped the polluting substances from the exhaust by a considerable large amount. For instance.

  • Sulphur oxides (SOx) are reduced by 5-times than before.
  • There is a 25% reduction of NOx (Nitrogen Oxides) in petrol engines and a nearly 70% reduction in diesel.

Read More: Will BS4 cars be BANNED after the official BS6 rollout?

Let’s come back to the question.


After 1st of April this year the registration of new BS4 vehicles will stop and no new BS4 vehicle will be manufactured. Even though, existing BS4 vehicles will keep on running on the road until there is no deadline to stop the old vehicles complying on road.

Utkarsh Bhardwaj
Utkarsh Bhardwaj
Technical Content Strategist at GoMechanic | Big Time Petrolhead with the passion for building cars and driving those beauties.


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