2.0L 4-Cylinder Engine Complete Assembly for 2022-2023 Volvo S60, XC40, XC60, XC90

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

• Verify your VIN: Confirm that the 4th and 5th digits of your VIN are 'L1'.
• Check the Engine Code: Verify that the barcode decal on the plastic timing cover or the stamped code on the engine block reads 'B420T2'.
• Confirm Drivetrain Type: Determine if your vehicle is Front-Wheel Drive (FWD) or All-Wheel Drive (AWD) to prepare for oil pan and bracket transfers.

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

Special tools this job needs:

• Volvo VIDA (Vehicle Information and Diagnostics for Aftersales)
• J2534 pass-thru interface
• Engine Timing Tool Kit (Volvo OEM 9997490 or CTA 7380)
• Vacuum Coolant Refilling Tool
• Engine support fixture/crane with a long reach
• Torque-angle gauge
• Comprehensive socket and Torx bit set

Budget for these consumables at install:

• Engine Oil: 6.1 liters of full synthetic oil meeting Volvo VCC RBS0-2AE 0W-20 specification (e.g., Castrol Edge Professional V 0W-20 or Motul Specific RBS0-2AE 0W-20)
• Oil Filter: New OEM-spec oil filter
• Engine Coolant: Volvo-approved G48/G11 blue phosphate-free coolant (mixed 50/50 with distilled water)
• Spark Plugs: New OEM Volvo spark plugs
• Gaskets & Seals: New intake and exhaust manifold gaskets, fuel injector seals, turbocharger mounting gaskets, and front/rear crankshaft seals
• Timing Belt & Wet Oil Pump Belt: Timing belt, tensioner, idler pulley, and the internal wet oil pump belt (Volvo part number 31669137)
• Torque-to-Yield (TTY) Bolts: Crankshaft pulley bolt, engine mount bolts, and exhaust manifold studs

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

What’s involved: VIN-specific dealer programming, ECM-to-CEM security synchronization, and 48V mild-hybrid system calibration (including Integrated Starter Generator initialization).

A standard OBDII scan tool cannot perform these steps. You must use Volvo VIDA (either at a Volvo dealership or via an independent shop with an active VIDA subscription) to make the vehicle run correctly after the swap. You will need to reuse your vehicle's original ECM, which may need a software update from the dealer to ensure it works correctly with the replacement engine and has all recent recall-related patches.

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

• 48V Hybrid System Safety: This engine is equipped with a 48V mild-hybrid system. Before disconnecting any electrical connectors, removing the engine, or handling the orange high-voltage cabling, you must follow the official Volvo service procedure to safely de-energize and isolate the 48V battery.
• The Wet Oil Pump Belt: The engine's oil pump is driven by a rubber belt submerged in engine oil inside the oil pan. While the engine is on the stand, drop the oil pan and inspect this belt. If there is any sign of swelling, cracking, or degradation, replace it immediately.
• Vacuum Coolant Bleeding: The B420T2 cooling system has multiple independent loops to cool the engine, turbocharger, and hybrid components. You cannot bleed this system using traditional gravity-fill methods. You must use a vacuum coolant refilling tool and run the VIDA-guided electronic bleeding sequence.
• Torque-to-Yield (TTY) Bolts: The crankshaft pulley bolt, engine mount bolts, and exhaust manifold studs are single-use stretch bolts. You must replace them with brand-new OEM fasteners and torque them to the exact multi-stage angle specifications.
• AWD Axle Bracket: On All-Wheel Drive models, the front drive axle is supported by a bracket that bolts directly to the engine block. This must be carefully disconnected and re-torqued upon installation.
• Installing with Transmission: Some technicians recommend removing the engine and transmission as a single unit. If removing the engine separately, you must properly support the transmission to avoid damage.
• Torque Converter Bolts: If separating the engine from an automatic transmission, the torque converter bolts must be accessed through the starter motor opening and removed sequentially by rotating the engine. Tighten these bolts gradually and evenly to prevent binding.

Easy to get right once you know them:

• Ordering for a Non-Hybrid T5 or T6 Vehicle: Trying to install this B420T2 mild-hybrid engine into an older or non-hybrid Volvo that originally had a T5 (B4204T series) engine. The physical block castings, accessory mounting points, wiring harnesses, and ECU architectures are completely different and incompatible.
• Skipping the 48V De-energizing Procedure: Failing to properly de-energize the 48V system, which frequently results in shorting out the hybrid system and ruining the expensive Battery Energy Control Module (BECM) or the Integrated Starter Generator (ISG).
• Using Non-Spec Engine Oil: Using standard, cheap 0W-20 oil. This engine requires oil that explicitly meets the Volvo VCC RBS0-2AE specification. Standard oils degrade rapidly, which can cause the internal wet oil pump belt to break.
• Drivetrain Oil Pan Mismatch: If your vehicle is AWD and the replacement engine came from a FWD model (or vice versa), the oil pan and intermediate axle shaft mounting brackets will differ. You must transfer your original oil pan and brackets.
• Ignoring the 'LESS TURBO' Note: Assuming a turbocharger is included. This listing explicitly states the turbo is missing. You must reuse your old turbo or buy another one.
• Failing to Budget for Dealer Programming: Overlooking the need for a tow to a dealership or specialized shop with a VIDA subscription for final programming.
• Ordering for a Non-Listed Vehicle: Assuming this unit will fit other models like the S90 or V90 because they also use a 'B5' mild-hybrid engine. You must verify your VIN's 4th and 5th digits are 'L1'.

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: