2.0L Non-Turbo Engine Complete Assembly for 2021-2024 Audi A4, A5, allroad

A quick look at your own vehicle makes sure the right engine shows up:

• Verify the 5th digit of the VIN is 'A' (or 'B' for Allroad models with engine ID DPAA).
• Verify the engine code on the white paper barcode label on the front upper timing cover is DPAA (or DPA).
• Confirm the vehicle is equipped with a 12V mild-hybrid (MHEV) system and automatic transmission.

What the install really takes — plan and budget with confidence:

Special tools this job needs:

• Engine hoist and load leveler
• Engine support bar
• Triple square (XZN) socket set
• Torx socket set
• Torque wrench
• Coolant vacuum refilling tool
• Audi-compatible diagnostic scan tool (VCDS or ODIS)

Budget for these consumables at install:

• 5.5 quarts (5.2 liters) of synthetic oil meeting VW 508.00 specification (0W-20)
• New OE-spec oil filter
• Audi/VW G12evo (or G12++/G13) coolant mixed 50/50 with distilled water
• New OE-spec spark plugs (part number 06Q905601A or equivalent)
• Exhaust manifold gasket
• Turbocharger mounting gasket and hardware
• Turbocharger oil and coolant line O-rings
• Intake manifold gasket (if transferring original)
• New torque-to-yield (TTY) stretch bolts for flywheel/flexplate, engine mounts, and exhaust downpipe

What your vehicle’s computers will need after the swap:

What’s involved: Crankshaft Position (CKP) Relearn, Fuel Injector IMA Coding, and Component Protection / Immobilizer adaptation

sources differ: Arm 1 states no immobilizer programming is required if keeping the original ECU, whereas Arm 2 states Component Protection removal and Immobilizer re-marriage are required. Cautious value 'yes' selected. Official ODIS software with a secure online GeKo connection is required for Component Protection, while VCDS can handle CKP relearn and injector coding.

Pro tips for a smooth first start-up — hand them to whoever does the install:

• The central spool valve for the variable valve timing (VVT) on the intake camshaft has a left-handed thread. Turning it counter-clockwise will snap or damage it.
• The 12V mild-hybrid BSG is liquid-cooled. You must vacuum-bleed the cooling system to prevent air pockets that cause the BSG to overheat and fail.
• Write down the 7-digit fuel injector IMA calibration codes before installing the intake manifold, as they are impossible to read once installed.
• You must prime the transferred turbocharger with clean engine oil before starting the engine for the first time to prevent bearing damage.
• To gain adequate access, the vehicle's entire front end must typically be placed into 'service position' or removed completely.

Easy to get right once you know them:

• Using standard 5W-30 or 5W-40 oil instead of the required VW 508.00 spec 0W-20 oil.
• Forgetting to record the 7-digit injector IMA codes before bolting down the intake manifold.
• Stripping the left-hand threaded VVT central spool valve by turning it counter-clockwise.
• Failing to vacuum-bleed the cooling system, leading to trapped air and immediate engine or BSG overheating.
• Reusing torque-to-yield (TTY) stretch bolts on critical components like engine mounts and the flywheel.
• Buying a transverse-mounted engine variant (e.g., from a VW GTI or Audi A3) instead of this longitudinal version.
• Ignoring the required Component Protection programming and expecting the vehicle to start immediately.

Not issues with the units on this page — the manufacturer documented these for every engine of this family, wherever you buy one. Handy for your installer: