O2 Oxygen Sensor Upstream Downstream for Lexus ES (2007-2011) 3.5L

Direct-Fit Replacement Oxygen Sensor Kit for 2007-2011 Lexus ES (XV40)

What it Does: The Direct-Fit Oxygen Sensor Kit replaces worn upstream air-fuel ratio and downstream lambda sensors on the 2007-2011 Lexus ES to restore factory fuel trim accuracy, optimize closed-loop engine management, and resolve diagnostic trouble codes.

The Stock Lexus ES Sensor Degradation

With accumulated mileage and continuous exposure to exhaust heat cycles, the factory zirconia sensing elements and internal ceramic heaters on the XV40 platform degrade. In the transverse 2GR-FE engine bay, Bank 1 firewall clearances trap extreme exhaust heat, accelerating sensor fouling from unburnt hydrocarbons and carbon particulates. This causes slow switching response times, asymmetric fuel-trim drift between banks, rough idle, unexpected fuel consumption spikes, and recurring trouble codes such as P0171, P0174, P0420, or P0430.

The Engineering Solution

This comprehensive 4-piece sensor package replaces both upstream wideband air-fuel ratio (A/F) sensors and downstream post-cat heated oxygen sensors simultaneously. Featuring laser-welded stainless steel bodies, fast-activating ceramic heater elements, and high-temperature dual-layer protection tubes, each sensor delivers rapid closed-loop transition times and resilient protection against thermal shock and exhaust contamination. Factory-pinned, weather-sealed terminal connectors and pre-loomed wiring eliminate the need for wire cutting, crimping, or re-pinning.

What's Included

• 1x Upstream Oxygen / Air-Fuel Ratio Sensor (Part # 234-9050)
• 1x Upstream Oxygen / Air-Fuel Ratio Sensor (Part # 234-9041)
• 1x Downstream Oxygen Sensor (Part # 234-4064)
• 1x Downstream Oxygen Sensor (Part # 234-4260)

Technical Specifications

Compatibility

• 2007-2011 Lexus ES350 Base Sedan 3.5L V6 (Engine: 2GR-FE, Chassis: XV40)

Frequently Asked Questions & Fitment Warnings

Does this fit the XV40 ES?

Yes, this is a direct fit for the 2007-2011 Lexus ES equipped with the 2GR-FE 3.5L engine.

Are these direct plug-in sensors or do they require wire splicing?

These sensors come with direct-fit OEM-style connectors and factory-length wiring harnesses, allowing simple plug-and-play installation without wire stripping or soldering.

The Lexus Standard

The refined operation of the Lexus luxury platform depends on accurate closed-loop stoichiometric feedback. Installing a fully matched sensor set across both exhaust banks ensures smooth, vibration-free idling, optimal MPG, and complete emission compliance without nuisance Check Engine lights.