INFINITI Q50 Parts Guide — All Engines, Common Repairs and Maintenance

The INFINITI Q50 is one of the most technically complex luxury performance sedans in its segment — offering four distinct powertrain configurations, the world's first steer-by-wire production system, and advanced driver assistance technology across its production run from 2014 to present. Ordering the correct parts for a Q50 requires knowing exactly which powertrain you have, whether your vehicle is equipped with Direct Adaptive Steering, and which trim-specific components apply to your configuration. This guide covers everything Q50 owners need to know. INFINITI of Akron stocks genuine OEM Q50 parts for every variant with nationwide shipping.

Q50 Powertrain Guide — Five Distinct Configurations

This is the most critical information for Q50 parts ordering. Engine-specific components including catalytic converters, oxygen sensors, air intakes, ECMs, and exhaust components are not interchangeable between powertrain variants.

Q50 3.7L V6 (2014–2015 only)

The naturally aspirated VQ37VHR V6 was used only in the first two Q50 model years before being replaced by the turbocharged lineup in 2016. This engine is the same unit used in the G37 and produces 328 horsepower. Parts for the 3.7L Q50 are specific to this engine family and are not compatible with any 3.0T components.

Q50 2.0T Turbocharged (2016–2020)

The 2.0L turbocharged four-cylinder engine was offered in Q50 Pure and base trims as the entry powertrain. It uses a completely different parts catalog from all V6 variants. Catalytic converters, air intakes, oxygen sensors, exhaust manifolds, and turbocharger components are all unique to the 2.0T four-cylinder.

Q50 3.0T Twin-Turbo 300HP (2016–present)

The VR30DDTT twin-turbocharged V6 in 300HP output is the most common Q50 powertrain. This engine uses specific turbocharger assemblies, intercooler pipes, exhaust manifolds, and catalytic converters that are not shared with naturally aspirated engines. The VR30DDTT is a sophisticated engine that responds strongly to OEM-specification maintenance.

Q50 3.0T Red Sport 400 (2016–present)

The 400HP output VR30DDTT uses the same engine architecture as the 300HP variant but with different turbocharger calibration, higher boost, and unique ECU mapping. Most engine components are shared but some exhaust and turbocharger components differ between output levels. The Red Sport also features upgraded Brembo front brakes, sport-tuned suspension, and performance-tuned DAS steering response not found on any other Q50 variant.

Q50 Hybrid (2014–2018)

The Q50 Hybrid pairs a 3.5L V6 with an electric motor assist system producing 360 combined horsepower. Hybrid-specific drivetrain components including the high-voltage battery, inverter, electric motor, and hybrid control module are unique to this variant. High-voltage hybrid components require specialized handling and should only be serviced by technicians with hybrid certification.

Direct Adaptive Steering — Complete Guide

INFINITI introduced Direct Adaptive Steering on the 2014 Q50 as the world's first production steer-by-wire system. Understanding DAS is essential for Q50 ownership because it creates specific requirements for parts, service, and diagnostics that differ from conventional steering systems.

How DAS Works

Traditional steering has a mechanical shaft connecting the steering wheel to the front wheels through the steering rack. DAS eliminates this mechanical connection entirely. Instead, sensors on the steering wheel read the driver's input, transmit it electronically to a control module, which commands electric actuators on the front wheels to move accordingly. A backup mechanical connection is included for safety if the electronic system fails.

DAS Parts Requirements

• Steering column assembly — Must be genuine OEM. The column contains the steering wheel sensors and feedback actuator that provides road feel to the driver. Third-party columns are not compatible with DAS calibration.
• Steering angle sensor — Safety-critical precision sensor. The accuracy of steering input measurement directly determines how the road wheel actuator responds.
• Road wheel actuator — The front-axle actuator that translates electronic commands to physical steering movement. INFINITI-exclusive component with no third-party equivalent.
• DAS control module — Pre-programmed to INFINITI specifications. Requires dealer-level programming tools for installation and calibration.

Any Q50 displaying steering system warning lights must be repaired exclusively with genuine OEM parts by a technician with INFINITI DAS service training. Attempting DAS repairs with non-OEM components creates a safety risk.

Common Q50 Repairs by Component

Exhaust System

Catalytic converter replacement is the highest-value Q50 repair part. Engine variant determines which converters are needed — confirm 2.0T, 3.0T 300HP, 3.0T 400HP, or 3.7L before ordering. The 3.0T twin-turbo uses converter assemblies positioned differently from naturally aspirated configurations due to the turbocharged exhaust routing.

Suspension

Q50 Sport trim uses upgraded front struts and rear shock absorbers with different spring rates from base trim. Red Sport 400 adds additional sport suspension tuning. Always confirm Sport or base trim before ordering any suspension component. Q50 suspension is known for good longevity under normal driving conditions.

Engine Sensors and Maintenance

The VR30DDTT twin-turbo requires OEM-calibrated oxygen sensors, mass air flow sensors, and boost pressure sensors to maintain proper fuel trim and turbocharger boost management. Spark plug replacement uses engine-specific iridium plugs at 60,000-mile intervals. Turbocharger oil supply line inspection is recommended at higher mileage.

Shop All Q50 Parts

Browse the complete genuine OEM INFINITI Q50 parts catalog: INFINITI Q50 OEM Parts — All Years and All Engines. Enter your VIN at checkout for confirmed fitment by engine variant and trim configuration.

Frequently Asked Questions