The 130bhp engine, which replaced the 115bhp unit in the Passat, went on sale in the Golf and Bora in June, but from October a 100bhp unit will replace the 90bhp TDI engine and they will both be joined by a new high-performance 150bhp TDI.
The 100bhp 1.9 TDI PD unit was also launched in the Passat in January and will also be included in the engine line-up for the new Volkswagen Polo next year. In the Golf, combined fuel economy will be 53.3mpg and CO2 emissions will be 143g/km.
The 150bhp engine boasts maximum torque of 234lb-ft from 1,900rpm but promises more than 50mpg on the combined cycle. Full pricing and specification details will be available closer to launch but the 100bhp cars are expected to be about £300 more than the 90bhp versions, while the 150bhp cars will be more expensive than the 130bhp versions, although they are likely to have CO2 emissions similar to the current 130bhp models (146g/km).