Lamborghini Urus Radiator Right 4M0145804BT 4M0121218G

In 2026, the part numbers 4M0145804BT and 4M0121218G refer to two critical cooling components located on the right-hand side (passenger side in LHD vehicles) of the Lamborghini Urus front bumper assembly.

Because the Urus utilizes a high-performance 4.0L Twin-Turbo V8, it requires a tiered cooling strategy. These two parts often sit in tandem behind the right air intake.

1. Technical Identification

Part 4M0145804BT: Charge Air Cooler (Intercooler)

• Function: This is the Right Side Intercooler. Its job is to cool the compressed air from the turbocharger before it enters the engine. Cooler air is denser, which allows for more power and prevents engine knock.

• Type: Water-to-Air heat exchanger.

• Placement: Generally the larger unit in the right-side duct.

Part 4M0121218G: Auxiliary Water Radiator

• Function: This is an Auxiliary Radiator for the engine’s main cooling loop. It provides additional surface area to keep coolant temperatures stable during high-speed driving or in hot climates.

• Type: Standard Aluminum/Plastic radiator.

• Placement: Often mounted slightly forward or adjacent to the intercooler.

2. 2026 Market Pricing (Estimated USD)

These parts carry the 4M0 prefix, indicating they are shared with the Audi MLB Evo platform (RSQ8, SQ7, Bentley Bentayga). However, “Lamborghini Boxed” versions usually command a premium.

3. Common “2026” Maintenance Notes

• Road Debris Damage: Because these sit low in the bumper with large open vents, they are prone to stone chips. If you notice a “coolant low” warning or a drop in boost pressure (limp mode), check these units for wet spots or bent fins.

• Vacuum Filling Required: The Urus cooling system is notorious for air pockets. When replacing 4M0121218G, you must use a vacuum coolant filler. Standard “pouring and burping” the system often fails, leading to localized overheating.

• Platform Sharing: In 2026, many independent shops source these via Audi parts channels. While the physical units are often identical to those in the Audi RSQ8, always verify the suffix (the “BT” or “G”) matches your VIN to ensure the mounting brackets align perfectly.

4. Signs of Failure

• For 4M0145804BT: A whistling sound under acceleration, “Drivetrain Malfunction” light, or oily residue inside the intercooler hoses.

• For 4M0121218G: Pink/Purple crusty residue (coolant) on the bottom of the right front bumper or a sweet smell after driving.