Shares of Maruti Suzuki came under pressure on Thursday, following a steep hike in petrol prices that triggered investor fears that sales may be hit. "Yesterday's petrol price increase by Rs 7.5 per litre is expected to impact auto demand directly. The sector has been coping with frequent hikes in petrol prices over the last three years. The hike fuels worries for a sector which is facing uncertainty about future sales and rising raw material cost," analysts said.