2019 — 2026
2.0L M139 Turbo - 310kW (S-Model)
Petrol
Inspect the front air intakes and radiator area for debris or bent fins. | Observation: Ensure there is no evidence of cooling system strain, as the M139 engine is a high-output unit that relies heavily on effective thermal management.
Listen closely while accelerating from a standstill. | Observation: Be mindful of any hesitation or clunky gear shifts in the 8-speed dual-clutch transmission, as smooth transitions are expected for this performance gearbox.
Check this by navigating over uneven road surfaces or speed bumps. | Observation: Listen for any suspension knocking, as the CLA45 S features a stiff AMG performance setup that can put pressure on bushings over time.
While driving at low speeds with the windows down, turn the steering wheel lock-to-lock. | Observation: It is worth noting if there are any clicking sounds, which could indicate wear in the front drivetrain or steering components common in high-torque 4MATIC systems.
Consider a major service check, including brake fluid and transmission oil inspection.
Typically the time to check the condition of the drive belts and spark plugs to maintain that high-performance spark.
Often a milestone where suspension components like struts or control arm bushes might begin to show their age.
Verify the service history confirms the use of Mercedes-AMG approved engine oil.
Check that the 4MATIC+ all-wheel-drive system has been serviced according to the factory schedule.
Inspect the brake pads and rotors for even wear, as they are essential for safely managing the car's power.
Confirm the infotainment and software systems have been updated at an official Mercedes-Benz service centre.
Ensure the cooling system levels are steady and the header tank shows no signs of discoloration.
Estimated repair costs if issues arise
Given the performance capabilities of the AMG braking system, you might eventually need to budget for premium replacements as these components are designed for high-heat friction.
To keep your gear changes crisp, it is common to consider a transmission fluid flush. This ensures the complex 8-speed gearbox continues to operate smoothly.
If this component needs attention in the future, remember that the CLA45 S requires specialized performance rubber to maintain its grip and handling characteristics.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer