WJIECO 2234-4138 oxygen sensor 4-Wire Heated O2 Lambda Sensor, OEM OE#89465-60150 89465-50120 89465-60430, Direct Replacement for Lexus LS430 GS430 SC430 GX470 LX470 Toyota Land Cruiser 4Runner 4.3L 4.7L V8, IATF 16949 Certified

234-4138 oxygen sensor Overview

The 234-4138 Oxygen O2 Sensor (cross reference DENSO 234-4138, Toyota OE# 89465-60150, 89465-50120, 89465-60430) is an OEM-grade downstream oxygen sensor engineered by WJIECO for gasoline Toyota and Lexus V8 passenger & off-road vehicles. Also known as a post-cat O2 sensor, this exhaust component is mounted after the catalytic converter. Its primary job is to monitor the oxygen content of exhaust gas leaving the catalyst, allowing the ECU to verify whether the catalytic converter is working properly. This sensor is critical for emissions compliance and catalyst health monitoring on large displacement V8 engines.

This sensor is designed as a direct factory replacement for these applications: Toyota Land Cruiser Prado, Toyota Tundra, Toyota Sequoia, Lexus LX470.

If your Toyota or Lexus vehicle triggers a persistent check engine light, failed emissions inspection, catalytic converter efficiency codes, or erratic sensor readings, your factory downstream oxygen sensor is likely suffering from sensing element contamination, signal drift or aging damage. Replacing the defective original sensor with this direct-fit 234-4138 replacement part is a cost-effective solution to restore your exhaust monitoring system.

OEM-Grade Construction and Strict Factory Testing

Our replacement 234-4138 oxygen sensor features a high-precision ceramic oxygen sensing element and reinforced anti-vibration internal circuit. It is engineered to withstand high exhaust temperature and vibration during highway cruising and rugged off-road use. The outer protective housing, wiring harness and electrical plug connector are fully dimension-matched to DENSO and Toyota OEM factory specifications, preventing wire cracking, water ingress and intermittent signal dropouts.

Every finished O2 sensor unit goes through high-temperature aging testing, oxygen signal calibration and waterproof sealing inspection before shipment. This quality check eliminates common flaws found in cheap generic sensors, such as unstable oxygen readings, slow signal response and early premature failure.

Exact Vehicle Compatibility & Interchange OE Numbers

This post-cat exhaust oxygen sensor is a direct replacement for the below Toyota / Lexus gasoline V8 vehicles. Interchange Part Numbers:

• DENSO: 234-4138
• Toyota OE: 89465-60150, 89465-50120, 89465-60430

Fitment List:

• Toyota Land Cruiser Prado
• Toyota Sequoia
• Toyota Tundra
• Lexus LX470

As a core component of the exhaust emission monitoring system, this downstream O2 sensor allows the ECU to evaluate catalytic converter performance. A faulty downstream oxygen sensor will trigger catalyst-related DTCs, cause failed emissions testing and illuminate the check engine light.

Core Benefits of Upgrading to the 234-4138 Oxygen Sensor

Replacing your malfunctioning factory post-cat O2 detector with our pre-calibrated WJIECO 234-4138 oxygen sensor delivers noticeable performance improvements and protects expensive catalytic converters. Unlike low-cost aftermarket sensors that repeatedly trigger fault codes due to poor calibration, our unit provides steady, accurate exhaust oxygen data for the vehicle ECU.

Reliable sensor measurements enable the engine computer to confirm catalytic converter function, avoid false catalyst fault codes, and keep your SUV or truck compliant with emission regulations. After installation, you can clear oxygen sensor related trouble codes and pass state emissions inspection.

Plug-and-Play Installation, No Dealer Programming Required

A key advantage of this 234-4138 oxygen sensor is its true plug-and-play design built for compatible Toyota and Lexus V8 models. This replacement part requires no ECU reprogramming, manual calibration, wire cutting or complicated mechanical modifications.

Installation works well for both professional repair garages and DIY vehicle owners. Simply remove the old sensor from the exhaust pipe after catalytic converter, apply anti-seize compound on threads, align and screw in the new sensor, reconnect the factory wiring plug, then clear stored fault codes using an OBD diagnostic scanner. After a short normal driving cycle, the exhaust emission monitoring system will return to stable operation without recurring warning alerts.

Every WJIECO sensor passes complete functional testing before leaving our factory. If you need a durable, high-precision and affordable OEM replacement downstream oxygen sensor matching DENSO 234-4138 and Toyota OE 89465-60150 / 89465-50120 / 89465-60430 for your Toyota Prado, Tundra, Sequoia or Lexus LX470, our 234-4138 Oxygen O2 Sensor is the ideal choice to restore your exhaust and emissions monitoring system.

Amazon.com: 234-4138 O2 Oxygen Sensor Upstream Air Fuel Ratio for Toyota 4Runner Lexus | Oxygen Sensor for Toyota 4Runner FJ Cruiser Land Cruiser Lexus GS430 LS430 SC430 4.3L GX470 LX470 4.7L Gasoline O2 Sensor : Automotive

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