O2 Oxygen Sensor Upstream Downstream for Infiniti QX60 (2015-2019) 3.5L

Direct-Fit Replacement Oxygen Sensor Set for 2015-2019 Infiniti QX60 (L50)

What it Does: The 4-piece oxygen sensor kit replaces degraded upstream air-fuel ratio and downstream heated O2 sensors on the 2015-2019 Infiniti QX60 to restore precise closed-loop fueling and eliminate check engine warnings.

The Stock Infiniti QX60 Sensor Degradation & Thermal Fatigue

Under sustained exhaust thermal cycling within the tight transverse bay of the L50 chassis, factory oxygen sensors suffer from internal heater failure and chemical poisoning from combustion blow-by. As the stock sensing element accumulates deposits, switching latency degrades, throwing diagnostic trouble codes (such as P0138, P0158, or P2A00) and locking the VQ35 engine management system into inefficient rich running conditions that diminish fuel mileage and foul catalytic converters.

The Engineering Solution

Engineered for high-temperature durability, these direct-fit sensors utilize fast-acting planar ceramic zirconia elements and factory-matched internal heating circuits to achieve rapid operational closed-loop status. High-grade double-braided PTFE harness insulation prevents heat embrittlement and environmental intrusion, while pre-treated high-temperature anti-seize on the threads ensures corrosion-resistant installation without galling into the exhaust bungs. Direct OE-spec pinouts interface seamlessly with the factory harness without splicing or repinning.

What's Included

• 4 x Oxygen Sensors (2 Upstream Air-Fuel Ratio Sensors, 2 Downstream O2 Sensors)

Technical Specifications

Compatibility

• 2015-2019 Infiniti QX60 Base / Luxe / Pure / Sensory 3.5L V6

Frequently Asked Questions & Fitment Warnings

Does this fit the L50 QX60?

Yes, this is a direct fit for the 2015-2019 Infiniti QX60 equipped with the VQ35DE or VQ35DD 3.5L V6 engine.

Do these sensors require wire splicing or harness modification?

No, all four sensors are plug-and-play units with direct-fit OEM terminal connectors and correct harness lengths.

The Infiniti Precision Standard

Maintain factory powertrain calibration and crisp V6 throttle response. Replacing worn oxygen sensors as a complete bank-to-bank set ensures synchronized lambda readings, preserving exhaust gas temperatures and factory efficiency across all driving conditions.