TFSI (Turbo fuel stratified injection) is a trade name that belongs to the Volkswagen Group. It is used for marking turbocharged engines with direct fuel injection system installed on Audi cars since 2004. This name is also used for some versions of 2 litre engines used on SEAT, Škoda, and Volkswagen cars.
Features of TFSI engines
Most of the TFSI engines are 4 cylinder power units with 8 or 16 valves. Versions with 6 cylinders and 24 valves are much rarer. The engine block is usually made of aluminium, however it can also be made of cast iron. The engines are equipped with a turbocharger, often a variable geometry one. Twin-turbo versions are also popular. The valve timing system is usually chain- or belt-driven. However, there are also combined versions of the timing mechanism, which use a chain and a belt at the same time.
Popular TFSI engines
| Series | Engine capacity, l | Version code | Number and arrangement of cylinders | Number of valves | Max. output, hp | Max. torque, N⋅m | Production start | Car models equipped with this type of engine |
| EA113 | 2.0 | AXX | inline-four | 16 | 200 | 280 | 2004 | Audi A3 8P; Volkswagen Golf 5; Volkswagen Passat B6 |
| EA111 | 1.2 | CBZB | inline-four | 8 | 105 | 175 | 2009 | Audi A3 8P |
| 1.4 | CAXA | inline-four | 16 | 122 | 200 | 2006 | Audi A1 8X | |
| EA211 | 1.2 | CJZA | inline-four | 16 | 105 | 175 | 2012 | Audi A3 8V |
| 1.4 | CXSA | inline-four | 16 | 122 | 200 | 2013 | Audi A3 8V | |
| 1.4 | CZEA | inline-four | 16 | 150 | 250 | 2014 | Audi Q2 GA; Audi A3 8V; Audi A1 8X; Audi Q3 8U | |
| 1.5 | DADA | inline-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 | inline-four | 16 | 120 | 230 | 2008 | Audi A4 B8 |
| CCTA | inline-four | 16 | 200 | 280 | 2008 | Audi A3 8P; Audi TT 8J; Audi Q3 8U | ||
| CDAA | inline-four | 16 | 160 | 250 | 2008 | Audi A3 8P; Audi A TT 8J | ||
| CDNB | inline-four | 16 | 180 | 320 | 2008 | Audi A4 B8; Audi A6 C7; Audi A5 8T; Audi Q5 8R | ||
| 2.0 | CYRB | inline-four | 16 | 250 | 370 | 2015 | Audi A5 F5; Audi A4 B9; Audi Q7 4M; Audi A4 allroad B9 |
Common malfunctions of TFSI engines
| Malfunctions | Engines |
| The intake valves and turbine blades quickly build up carbon deposits. | AXX; CAXA; CJZA; CDAA; CCTA; CDNB; CABA |
| Ignition coils have a short lifespan. | AXX; CDNB; CDAA; CABA |
| The cam phaser breaks down rather early. | AXX |
| The timing belt or chain wears out relatively quickly. | AXX; CBZB; CAXA; CYRB; CCTA; CDAA; CDNB; CABA |
| Engine vibrates excessively when idling. | CBZB |
| The electric actuator responsible for changing the turbine blades angle breaks down often. | CAXA; CJZA; CXSA; CZEA; CBZB |
| The pistons can crack due to the use of poor-quality fuel. | CAXA |
| Oil consumption increases significantly due to sticking of the piston rings or clogging of the crankcase ventilation system. | CXSA; CZEA; CDAA; CDNB; CYRB; CCTA |
| The camshafts wear out unevenly. | CZEA |
| The high-pressure fuel pump often starts leaking. | CDAA |
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