Tata Motors will stop production of the diesel versions of the Tiago and the Tigor. This is due to the fact that the demand for diesels in the small car segment is expected to decline after the BS-VI norms come into effect from April 1, 2020, as the cars with BS-VI engines will become even more expensive.

Mayank Pareek, president of Tata Motors Passenger Vehicles Business Unit, told PTI, "We feel that low demand for entry- and mid-size diesel models will not justify the high costs involved in developing a new small-capacity engine."

Currently, Tata Motors offers a 70hp, 1.05-litre diesel engine in its Tiago hatchback and Tigor compact sedan. It also offers a 110hp 1.5-litre diesel in the Nexon compact SUV, a 140hp 2.0-litre diesel in the recently launched Harrier SUV and a 156hp 2.2-litre diesel unit in the flagship Hexa SUV. The Fiat-sourced 1.3-litre diesel that powers the Zest and Bolt will the end of production, as the motor will not be upgraded for BS-VI norms.