TFSI (Turbo Fuel Stratified Injection) is a brand name of Volkswagen group. It designates turbocharged engines with a direct injection system, which Audi models have been equipped with since 2004. This designation is also used for a number of versions of 2-liter engines for SEAT, Škoda and Volkswagen models.
Features of TFSI engines
Most TFSI engines have 4 cylinders and are equipped with 8 or 16 valves. The 6 cylinder, 24 valve versions are much rarer. The engine block is usually made of aluminum but can also be made of cast iron. The engines are turbocharged, often with variable geometry. The twin-turbo versions are also popular. The valve timing system is usually chain or belt driven. However, there are also versions of the timing mechanism that use a combination of chain and belt.
Popular TFSI engines
| Series | Displacement, l | Index | Number and arrangement of cylinders | Number of valves | Max. Power, hp | Max. Torque, Nm | Year of manufacture | Car models equipped with this type of engine |
| EA113 | 2.0 | AXX | Line-Four | 16 | 200 | 280 | 2004 | Audi A3 8P; Volkswagen Golf 5; Volkswagen Passat B6 |
| EA111 | 1.2 | CBZB | In-Line Four | 8 | 105 | 175 | 2009 | Audi A3 8P |
| 1.4 | CAXA | Line-Four | 16 | 122 | 200 | 2006 | Audi A1 8X | |
| EA211 | 1.2 | CJZA | Line Four | 16 | 105 | 175 | 2012 | Audi A3 8V |
| 1.4 | CXSA | Line Four | 16 | 122 | 200 | 2013 | Audi A3 8V | |
| 1.4 | CZEA | Line Four | 16 | 150 | 250 | 2014 | Audi Q2 GA; Audi A3 8V; Audi A1 8X; Audi Q3 8U | |
| 1.5 | DADA | Line Four | 16 | 150 | 250 | 2017 | Audi A1 GB; Audi Q2 GA; Audi A3 8V; Audi Q3 F3 | |
| EA839 | 3.0 | CWGD | V6 | 24 | 354 | 500 | 2016 | Audi S4 B9; Audi S5 F5; Audi SQ5 FY |
| 3.0 | CZSE | V6 | 24 | 340 | 500 | 2017 | Audi A8 D5; Audi Q8 F1 | |
| EA888 | 1.8 | CABA | In-Line Four | 16 | 120 | 230 | 2008 | Audi A4 B8 |
| CCTA | In-Line Four | 16 | 200 | 280 | 2008 | Audi A3 8P; Audi TT 8J; Audi Q3 8U | ||
| CDAA | Line Four | 16 | 160 | 250 | 2008 | Audi A3 8P; Audi A TT 8J | ||
| CDNB | In-Line Four | 16 | 180 | 320 | 2008 | Audi A4 B8; Audi A6 C7; Audi A5 8T; Audi Q5 8R | ||
| 2.0 | CYRB | Line Four | 16 | 250 | 370 | 2015 | Audi A5 F5; Audi A4 B9; Audi Q7 4M; Audi A4 allroad B9 |
Frequent defects of TFSI-motors
| Defects | Engines |
| Carbon deposits quickly form on the intake valves and turbine runners. | AXX; CAXA; CJZA; CDAA; CCTA; CDNB; CABA |
| The ignition coils have a short service life. | AXX; CDNB; CDAA; CABA |
| The camshaft adjuster breaks prematurely. | AXX |
| The toothed belt or the chain use relatively quickly. | AXX; CBZB; CAXA; CYRB; CCTA; CDAA; CDNB; CABA |
| The engine vibrates excessively when idling. | CBZB |
| The electric actuator that drives the often fails. | CAXA; CJZA; CXSA; CZEA; CBZB |
| Low quality fuel can damage the pistons. | CAXA |
| Oil consumption increases significantly on when the piston ring is sticking or the crankcase is clogged. | CXSA; CZEA; CDAA; CDNB; CYRB; CCTA |
| The camshafts wear unevenly. | CZEA |
| The high-pressure fuel pump often starts to leak. | CDAA |
