Denso 234-4015 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4015

Denso 234-4015 is a heated oxygen sensor built to OE-style specifications for direct replacement in the exhaust stream. It is a specific-fit sensor for the downstream position on select Lexus IS300 models, with the correct connector, thread size, and harness length for a precise installation.

• Heated oxygen sensor for faster operating response
• Specific fit for direct replacement on the listed application
• 4-wire design with male connector
• Threaded mounting type with 0.708 in. thread diameter
• 27.17 in. wiring harness length
• OE Style construction for factory-like fit and function

OE Style Design and Sensor Construction

The Denso OE Style line is built for exact replacement and first-time fit on the intended vehicle application. This oxygen sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable sensor operation and consistent engine management performance. For buyers searching for a Lexus IS300 downstream oxygen sensor or Denso 234-4015 replacement, this part matches the listed OE-style application requirements.

This part cross-references Toyota 8946553110 and Bosch 13643 for the same application.

Vehicle Fitment

• Fits 2001-2005 Lexus IS300, downstream, cylinder 1,2,3; OE Style

Common Issues This Sensor Can Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect air-fuel feedback readings from a worn sensor
• Reduced fuel economy caused by slow sensor response
• Rough engine performance tied to contaminated or aging sensor elements
• Emissions test failures caused by a malfunctioning oxygen sensor

Installation Notes and Tips

Confirm the downstream location and connector match before installation. The sensor uses a threaded mount and a 4-wire male connector, so verify the harness routing and thread diameter against the original part on the Lexus IS300. For best results, inspect the exhaust bung threads and wiring path before tightening the sensor into place.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for accurate replacement fitment and dependable operation. The OE Style design is intended to match the original sensor configuration on the listed Lexus IS300 applications.