It has the next engine codes: CDAA, CDHA, and CDHB. The Gen 2 of the 1.8TSI engine for some time was produced together with Gen1, but the Gen2 became the most widespread version. The engineers quickly made work on bugs and released the second generation in 2008. The first generation of 1.8TSI EA888 was produced until 2010, but the second generation appeared already in 2008 (a year later after Gen1 was released). The 1.8 TFSI engines for Audi applications (CABA, CABB, and CABD engines) feature the Fuel Stratified Injection (FSI) system and variable oil pump. The ECU for 1.8 TSI EA888 Gen1 is Bosch Motronic MED 17.5. The fuel is delivered by a direct fuel injection system with sequential solenoid-controlled six-hole fuel injectors. The turbocharger provides the max pressure of 0.6 bar (8.7 psi). The engine has a variable length intake manifold made of plastic and BorgWarner KKK K03 water-cooled turbocharger integrated into cast iron exhaust manifold.

The valves are actuated by low-friction roller finger cam followers equipped with automatic hydraulic valve clearance compensation. The intake valve diameter is the 34.0 mm the exhaust valve diameter - 28.0 mm stem diameter for both valves is 6 mm. There are four valves per cylinder (two intake and two exhaust valves). The intake camshaft has a variable intake valve timing adjustment system. The 1.8TSI Gen 1 has an aluminum 16-valve cylinder head with chain-driven double overhead camshafts. The engine got steel crankshaft with eight counterweights, new aluminum alloy pistons, and 148 mm long connecting rods.

For vibration reduction, the crankcase was equipped with two chain-driven counter-rotating balance shafts. This is the strong and reliable material which also has good acoustic dampening properties. The engine is built around a grey cast iron cylinder block and crankcase. This engine was developed from scratch the 88 mm (3.46 in) cylinder spacing is the only common feature with the predecessor. The 1.8TSI Gen 1 by Volkswagen's codes BYT and BZB was a replacement for the 2.0 TSI EA113 engine.

Audi a3 1.8 tfsi specifications