OSC 13643 Premium OE Fitment Oxygen Sensor Downstream 4-Wire Thimble

The OSC 13643 is a premium OE-fitment oxygen sensor (O2 sensor) designed as a direct replacement for select Lexus IS300 applications. Engineered to meet or exceed original equipment specifications, this downstream sensor restores proper exhaust monitoring and helps your engine control unit maintain the ideal air-fuel ratio for efficient combustion.

An oxygen sensor continuously monitors the oxygen content in exhaust gases and relays that data to the engine ECU. A worn or failing O2 sensor can result in poor fuel economy, elevated emissions, rough running, and accelerated catalytic converter wear — making timely replacement essential to both performance and emissions compliance.

Key Features:

• True Direct-Fit Design — OE-type connector and wiring harness included for plug-and-play installation with no splicing required
• Fast-Acting Heater Element — Brings the sensor up to operating temperature within seconds for immediate and accurate exhaust monitoring
• Pre-Coated Threads — Anti-seize compound applied at the factory simplifies installation and protects against thread galling
• Zirconium Ceramic Element — Premium sensing material delivers precise, responsive oxygen detection for accurate air-fuel mixture control
• 4-Wire Heated Thimble Sensor — Compatible with Planar and Thimble-type sensor applications
• 18mm Thread Diameter — Standard OE thread size for straightforward fitment
• 27" (686mm) Wire Length — OE-length harness for clean, factory-style routing
• 100% Functionally Tested — Every sensor undergoes a full quality test before leaving the factory

Cross-references include: Denso 234-4015, Delphi ES20059, ACDelco 213-1607, Standard Ignition SG1020/SG1027, Walker Products 250-24226, and OEM Toyota/Lexus part numbers 8946553200 and 8946553110. Sold individually.