Engine Number/Engine Characteristics

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NOTE:

The engine number is only visible if the front engine cover is removed.

Fig 1: Engine Code And Serial Number Location

Courtesy of AUDI OF AMERICA, LLC

The engine number ("engine code" and "serial number") is located at front on cylinder block, below the right cylinder head -arrow-.
Engine codes beginning with "C" are four-digit.
The first three digits of the engine code stand for displacement and the mechanical structure of the engine. They are stamped in the cylinder block, including the serial number.
The fourth digit represents the engine output and torque and is dependent on the engine control module.

NOTE:

The four digit engine code is on the type plate, vehicle data label and engine control module.

Codes		CTUC	CTUD
Displacement	liter	2.995	2.995
Output	kW at RPM	200/4800 to 6500	260/6000 to 6500
Torque	Nm at RPM	400/2250 to 4250	470/4000 to 4500
Bore	diameter in mm	84.5	84.5
Stroke	mm	89.0	89.0
Compression ratio		10.5	10.5
RON	at least	95 ¹⁾	98 ²⁾
Fuel injection and ignition system		Simos	Simos
Ignition sequence		1-4-3-6-2-5	1-4-3-6-2-5
Exhaust Gas Recirculation (EGR)		no	no
Turbocharger, G-Charger		Supercharger	Supercharger
Knock control		2 sensors	2 sensors
Charge air cooler		yes	yes
Oxygen sensor regulation		2 sensors before catalytic converter 2 sensors after catalytic converter	2 sensors before catalytic converter 2 sensors after catalytic converter
Variable valve timing		Intake	Intake
Variable intake manifold		no	no
Secondary Air Injection System		yes	yes
Valve per cylinder		4	4
¹⁾ Regular unleaded RON 91 is permitted although with reduced engine power. ²⁾ Super unleaded RON 95 is also permitted, but performance will be reduced.