Then your taxable BIK will be 6% of the value of the car when new, which is €2,700. This will be subject to PAYE and PRSI so, presuming you are on the higher rate of tax, will give you additional tax for the year of €1,269 or just over €105 each month.
The 131 is the gross figure before tax 54 after tax assuming 41% tax and full rate PRSI
Did you pay anything towards the cost of the car?
Are you doing over 30K miles?
Ask your employer /wages person /accountant how BIK is calculated