Audi engine codes: what they mean

The Audi engine naming system can be complex to understand. What does 35 TFSI mean? Here's our guide to Audi engine codes

Simon Ostler
Nov 18, 2021

Getting confused by the ever-growing list of code names car manufacturers are coming up with to refer to their latest models? If all the technology acronyms weren't bad enough, even telling one car from another can prove tricky sometimes. If you're struggling to get a clear idea of which Audi you'd like to buy, we've broken down what all those letters and numbers mean for you.

Buying a car can sometimes feel complicated, especially if you're trying to decipher Audi's engine codes. You can't just buy an Audi A3, in fact if you take a look at the latest version of Audi's family hatchback, you'll have a broad catalogue of A3s to choose from, such as the Audi A3 35 TFSI S line S tronic.

So what on earth does all that mean? Well, it is quite simple, but it's much less simple than it could be. The 'Audi A3' bit is easy enough to understand, and 'S line' refers to the style of the car and the amount of tech on board. It's known as a 'trim', and there are five trims to choose from with the A3: from Technik (the cheapest), through Sport, S line, Edition 1 and Vorsprung (the most expensive). The final 'S tronic' part indicates that this particular car is fitted with Audi's slick automatic gearbox.

The complicated bit comes when you get to the '35 TFSI' part. This indicates which engine is fitted under the bonnet of a particular model, but it doesn't do a very helpful job if you're new to this kind of thing. Let's dig into the details of what it all means.

Audi offers a broad range of engines, with certain models being available with certain engines. In the case of the A3, you have the choice of a 30 TFSI, a 30 TDI, a 35 TFSI, a 35 TDI, a 40 TFSI and a 40 TDI. The TFSI acronym refers to a petrol engine, and the TDI refers to diesel, but what do all the numbers mean?

In autumn 2017, the Audi ditched its numerical badging system which consisted of '2.0' referring to a 2.0-litre engine, and replaced it with a new system that uses this complicated coding format.

This system doesn't take into account the size of the engine, only the power output. In the simplest terms, the smaller the number, the less powerful the engine. So while a 35 TFSI is a 1.5-litre petrol engine and the 35 TDI is a 2.0-litre diesel engine, they both produce a similar amount of power... still with us?

Audi engine badging

This all may seem a little unnecessary, but the reason the German brand has seen fit to use this new naming system is understandable. It comes down to the fact that the size of the engine has less bearing on the amount of power it produces than it used to. A small, yet turbocharged 1.0-litre engine can produce more power than a standard 1.4-litre alternative.

It does make sense, therefore, to order engines according to their power output instead. Although you'll see from the tables below that each of these engine categories features plenty of variety; they may share the same engine number, but an Audi A3 40 TFSI doesn't produce the same amount of power as an Audi A5 40 TFSI.

Generally speaking, the engine power outputs can be categorised as such:

BadgePower
25Less than 100hp
30110-120hp
35150hp
40190-210hp
45230-270hp
50280-300hp
55360-385hp
60More than 400hp

 

So if you're looking for a more powerful engine that will offer more performance, an Audi model with a higher engine number is likely to be your pick. More sizeable models such as the A8 or Q7 are only available with larger and more powerful engines, so you don't need to worry about accidentally picking an SUV with a small engine.

A range of plug-in hybrid models are also available, and these follow the same naming format with higher numbers for higher power outputs, although these follow their own rules and do not necessarily match the brackets shown above.

It's also worth noting that the Audi e-tron range of electric cars present their power outputs in Kilowatts (kW), so these will be different from the standard 'hp' measurements. In terms of conversion, 100kW is equal to around 134hp, and the numbered e-tron motors do fit roughly within the brackets shown above. An Audi Q4 35 e-tron, for example, produces 125kW (or 168hp).

Audi engine codes

Click below to find a list of engines available for each Audi model.

Audi A1

BadgeEngine sizePower
25 TFSI1.0-litre95hp
30 TFSI1.0-litre110hp
30 TFSI1.0-litre116hp
35 TFSI1.5-litre150hp
40 TFSI2.0-litre207hp

Audi A3

BadgeEngine sizePower
25 TFSI1.0-litre95hp
30 TFSI1.0-litre110hp
35 TFSI1.5-litre150hp
40 TFSI2.0-litre190hp
30 TDI2.0-litre116hp
35 TDI2.0-litre150hp
40 TDI2.0-litre200hp
40 TFSI e1.4-litre204hp

Audi A4

BadgeEngine sizePower
35 TFSI2.0-litre150hp
40 TFSI2.0-litre204hp
45 TFSI2.0-litre265hp
30 TDI2.0-litre136hp
35 TDI2.0-litre163hp
40 TDI2.0-litre204hp

Audi A5

BadgeEngine sizePower
35 TFSI2.0-litre150hp
40 TFSI2.0-litre204hp
45 TFSI2.0-litre265hp
35 TDI2.0-litre163hp
40 TDI2.0-litre204hp

Audi A6

BadgeEngine sizePower
40 TFSI2.0-litre204hp
45 TFSI2.0-litre265hp
55 TFSI3.0-litre340hp
40 TDI2.0-litre204hp
50 TDI3.0-litre286hp
50 TFSI e2.0-litre299hp
55 TFSI e2.0-litre367hp

Audi A7

BadgeEngine sizePower
45 TFSI2.0-litre265hp
55 TFSI3.0-litre340hp
40 TDI2.0-litre204hp
45 TDI3.0-litre245hp
50 TDI3.0-litre286hp

Audi A8

BadgeEngine sizePower
55 TFSI3.0-litre355hp
50 TDI3.0-litre286hp
60 TFSI e3.0-litre355hp

Audi Q2

BadgeEngine sizePower
30 TFSI1.0-litre110hp
35 TFSI1.5-litre150hp
40 TFSI2.0-litre190hp
30 TDI2.0-litre116hp
35 TDI2.0-litre150hp

Audi Q3

BadgeEngine sizePower
35 TFSI1.5-litre148hp
35 TFSI1.5-litre150hp
40 TFSI2.0-litre190hp
45 TFSI2.0-litre245hp
35 TDI2.0-litre148hp
35 TDI2.0-litre150hp
40 TDI2.0-litre200hp
45 TFSI e1.4-litre245hp

Audi Q4

BadgeEngine sizePower
35 e-tronElectric125kW
40 e-tronElectric150kW
50 e-tron quattroElectric220kW

Audi Q5

BadgeEngine sizePower
45 TFSI2.0-litre265hp
40 TDI2.0-litre204hp
50 TFSI e2.0-litre299hp
55 TFSI e3.0-litre367hp

Audi Q7

BadgeEngine sizePower
55 TFSI3.0-litre340hp
45 TDI3.0-litre231hp
50 TDI3.0-litre286hp
55 TFSI e3.0-litre381hp
60 TFSI e3.0-litre462hp

Audi Q8

BadgeEngine sizePower
55 TFSI3.0-litre340hp
50 TDI3.0-litre286hp
55 TFSI e3.0-litre381hp
60 TFSI e3.0-litre462hp

Audi e-tron

BadgeEngine sizePower
50 e-tronElectric230kW
55 e-tronElectric300kW
SElectric370kW

Audi TT

BadgeEngine sizePower
40 TFSI2.0-litre197hp
45 TFSI2.0-litre245hp

 

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