Hello Mr. Ramakrishnan,
The Maruti Ertiga gets a warranty period of either 2 years or 40,000kms, whichever earlier. However, you can purchase extended warranty package offered by Maruti which is of either 3 years or 60,000kms and either of 4 years or 80,000 kms by paying a certain amount of sum.
Maruti has announced offers on Wagon R, Alto 800 and K10, but there are no announcements about offers on Ertiga. But, you can expect to get some offers later in the month. For exclusive offers, please visit your nearest Maruti dealer to find out the details.