AUDI is extending its diesel engine offering with the launch of a 167bhp 2.0 TDI unit in the A3 and A4 ranges.

Available in front and four-wheel drive forms, the 2.0 TDI 170 engine offers up to 48.7mpg and CO2 emissions from 154g/km.

The TDI 170 costs from £18,930 in the A3 range and £22,965 in the A4. Deliveries begin in July.