Oxygen O2 Sensor 234-4260 | 4-Wire Heated Upstream Downstream Replacement for Toyota Camry Lexus ES350 4Runner Tundra

📌 Product Overview

Restore optimal engine performance, fuel efficiency and emission compliance with this premium OE-replacement oxygen sensor, engineered as a direct fit for a wide range of Toyota and Lexus vehicles. Built with a high-precision zirconia sensing element paired with platinum electrodes, it accurately measures oxygen levels in exhaust gas and transmits real-time data to the vehicle’s ECU, enabling continuous air-fuel ratio optimization for cleaner combustion and smoother engine operation.

This 4-wire heated sensor is suitable for both upstream (pre-catalyst) and downstream (post-catalyst) installation positions depending on your vehicle configuration. It comes with a 40cm pre-wired harness and factory-matching connector for true plug-and-play installation, with no splicing or modification required. Replacing a faulty O2 sensor with this unit will resolve check engine lights, improve gas mileage, restore smooth idle and acceleration, and ensure your vehicle meets emission standards.

✨ Core Key Features

🎯 High-Precision Zirconia Sensing Element

Premium zirconia ceramic sensing core with platinum electrodes delivers fast, accurate oxygen level detection
Rapid response time ensures real-time air-fuel ratio feedback to the ECU
Consistent signal output across wide temperature ranges for reliable all-condition performance
Effectively corrects rich/lean fuel mixture issues to restore factory-level combustion efficiency

🛡️ High-Temperature Resistant Heavy-Duty Construction

Robust stainless steel metal housing resists corrosion, vibration and extreme exhaust heat
Protective PTFE filter prevents exhaust contaminants from damaging the internal sensing element
Double-layer sealing structure shields the ceramic core for extended service life
Heat-resistant insulated wiring harness maintains signal stability under high under-hood temperatures

🔌 Direct OE Fit Plug-and-Play Installation

Factory-molded electrical connector matches original vehicle harness perfectly
Pre-threaded mounting base fits standard exhaust bungs without modification
40cm integrated wiring harness reaches factory mounting positions with proper slack
No cutting, splicing or rewiring needed — installs with basic hand tools

⚡ Improves Fuel Economy & Engine Performance

Optimizes air-fuel mixture to maximize combustion efficiency and reduce wasted fuel
Resolves rough idle, hesitation, poor acceleration and declining gas mileage
Helps restore normal emission levels to pass inspection requirements
Works with the vehicle’s ECU to maintain ideal operating parameters across all driving conditions

🚗 Broad Toyota & Lexus Vehicle Compatibility

Direct cross-reference for Denso 234-4260 and over 20+ Toyota OEM part numbers
Covers sedans, SUVs, trucks and off-road models across multiple model years
Functions correctly in both upstream and downstream positions on applicable vehicles
Ideal for professional repair shops and DIY vehicle maintenance

📊 Full Technical Specifications

Parameter	Exact Details
Product Type	Heated 4-Wire Zirconia Oxygen (O2) Sensor
Replacement Part Number	234-4260
OEM Cross Reference	8946504300, 8946504320, 8946504340, 8946504350, 8946506200, 8946506250, 8946507050, 8946507070, 894650C160, 894650C170, 894650C180, 894650D040, 894650T030, 8946533360, 8946533460, 8946535680, 8946536040, 8946560250, 8946560290, 8946560300, 8946560320, 8946560330, 89465BZ110
Wire Configuration	4 Wires (Heated)
Total Harness Length	40cm
Sensing Material	Zirconia Ceramic + Platinum Electrodes
Housing Material	High-Temperature Resistant Stainless Steel
Thread Size	Standard M18x1.5
Mounting Type	Thread-In Installation
Installation Position	Upstream (Pre-Catalyst) / Downstream (Post-Catalyst)
Connector Type	Factory-Matching Direct Plug-In
Condition	100% Brand New

Complete Vehicle Fitment List

Lexus Models

ES350: 2007–2014
GX460: 2010–2013
GX470: 2003–2004
LX470: 2005–2007
LX570: 2008–2013

Toyota Models

4Runner: 2003–2012
Avalon: 2005–2014
Camry: 2007–2014
FJ Cruiser: 2007–2012
Land Cruiser: 2005–2013
Sequoia: 2005–2015
Solara: 2007–2008
Tacoma: 2005–2012
Tundra: 2005–2016
Venza: 2009–2014

📦 Package Included

✅ 1 × Oxygen O2 Sensor (234-4260)

🔧 Installation Guide

Ensure the vehicle is turned off and the exhaust system has fully cooled to avoid burn injury.
Locate the faulty oxygen sensor on the exhaust pipe. Upstream sensors are mounted after the exhaust manifold and before the catalytic converter; downstream sensors are mounted after the catalytic converter.
Disconnect the original sensor wiring harness connector.
Use an oxygen sensor socket wrench to carefully unscrew and remove the old sensor.
Thread the new sensor into the exhaust bung by hand to avoid cross-threading, then tighten to the specified torque with a wrench.
Reconnect the electrical plug until it clicks firmly into place.
Clear stored engine fault codes with an OBD2 scanner, then start the engine to verify normal operation.
Professional installation by a certified automotive technician is recommended.

Position Function Reference

Upstream sensor: Installed between the exhaust manifold and catalytic converter. It measures oxygen content in post-combustion exhaust gas and sends data to the ECU to adjust fuel injection and optimize the air-fuel mixture.
Downstream sensor: Installed after the catalytic converter. It monitors oxygen levels in purified exhaust to verify catalytic converter efficiency and emission compliance.

⚠️ Important Usage Notes

Fitment verification: Before ordering, confirm your vehicle’s year, model, engine displacement and sensor position match the listed specifications. Verify your original sensor has the same connector shape and wire count.
Installation precautions: Do not drop, impact or bend the sensing tip, as this can damage the internal ceramic element. Never apply anti-seize compound directly to the sensor threads unless it is sensor-specific conductive anti-seize.
Fault code reset: After replacement, clear existing OBD2 fault codes and allow the vehicle to complete a drive cycle for the ECU to recalibrate. If the check engine light returns, inspect wiring harness continuity and related engine systems.
Safety notice: Always perform exhaust work on a cold engine. Work in a well-ventilated area and follow standard automotive safety practices.

✅ Rigorous Pre-Shipment Quality Inspection

Every oxygen sensor passes strict multi-point quality control before delivery:

Appearance & Dimension Check: Confirmed 40cm total harness length; sensor housing and connector free of dents, cracks, corrosion and contamination
Structure Verification: Verified zirconia sensing element, platinum electrode construction, stainless steel housing and insulated wiring assembly
Function Test 1: Validated sensing element response performance; confirmed accurate oxygen detection and stable electrical signal output
Function Test 2: Cross-checked part number 234-4260 and all corresponding OEM cross-reference numbers; verified connector pin layout matches factory specification
Fit Check: Confirmed thread size, connector shape and harness length match all listed Toyota and Lexus vehicle applications

💬 Customer Satisfaction Guarantee

We are committed to providing high-quality automotive replacement sensors and reliable customer service. All products pass strict quality inspection before delivery. We offer fast free shipping and a 60-day hassle-free return policy. If you have any questions about fitment, installation or product performance, please contact us through eBay messages anytime. Our dedicated team will respond promptly and help resolve any issues to your satisfaction.