Denso 234-4154 Oxygen Sensor - Downstream or Upstream

Denso OE Style Oxygen Sensor 234-4154

Denso 234-4154 is an OE Style heated oxygen sensor built for specific-fit replacement on select Toyota and Lexus applications. It is engineered for accurate exhaust feedback, stable engine management, and a first-time fit on downstream and upstream locations where listed.

Key Features

• Heated oxygen sensor for faster operating readiness
• Specific-fit design for direct replacement on listed applications
• 4-wire configuration with 12.91 in. wiring harness length
• OE Style construction for Toyota and Lexus fitment
• Built with Denso’s aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination

OE Style Construction

Denso’s OE Style line is built to match original equipment dimensions and electrical requirements for the listed Toyota 4Runner, Tacoma, Tundra, Pickup, Land Cruiser, and Lexus LX470 applications. The Denso 234-4154 oxygen sensor is precision built for direct replacement, helping restore proper exhaust monitoring and consistent fuel-control feedback after sensor wear or contamination.

This part cross-references Bosch (e.g., 13095, 13104) for the same application.

Vehicle Fitment

• Fits 2005 Lexus LX470, downstream; to 05/05; OE Style
• Fits 2005 Toyota Land Cruiser, downstream; to 05/05; OE Style
• Fits 1998-2004 Lexus LX470, downstream; OE Style
• Fits 1998-2004 Toyota Land Cruiser, downstream; OE Style
• Fits 2000-2002 Toyota Tundra, downstream; OE Style
• Fits 1999-2000 Toyota 4Runner, downstream; excluding California.; OE Style
• Fits 1999-2000 Toyota 4Runner, downstream; California exempt parts can be used on pollution controlled vehicles in California.; OE Style
• Fits 1993-1995 Toyota 4Runner, downstream; California exempt parts can be used on pollution controlled vehicles in California.; OE Style
• Fits 2000 Toyota Tacoma, downstream; excluding California.; OE Style
• Fits 1995-2000 Toyota Tacoma, upstream; OE Style
• Fits 1995-1999 Toyota Tacoma, downstream; OE Style
• Fits 1996-1998 Toyota 4Runner, downstream; OE Style
• Fits 1996-1998 Toyota T100, upstream; OE Style
• Fits 1993-1995 Toyota Pickup, downstream; California exempt parts can be used on pollution controlled vehicles in California.; OE Style
• Fits 1993-1995 Toyota Pickup, downstream; Calif.; USA Built; OE Style
• Fits 1993-1995 Toyota Pickup, downstream; Japan Built; Calif.; OE Style

Common Issues This Sensor Can Address

• Faulty oxygen sensor readings that affect air-fuel control
• Check engine light concerns related to sensor performance
• Reduced fuel economy caused by aging exhaust sensors
• Slow sensor response after contamination or wear
• Incorrect downstream or upstream feedback on listed Toyota and Lexus vehicles

Installation Notes and Tips

Confirm the sensor position, connector style, and vehicle build notes before ordering. This Denso 234-4154 is a specific-fit heated oxygen sensor with a 4-wire layout, so it should be matched to the exact downstream or upstream application shown in the fitment list. For Toyota 4Runner, Tacoma, Tundra, Pickup, Land Cruiser, and Lexus LX470 coverage, verify California and build-date notes where listed.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards. The design includes an aluminum oxide trap layer intended to help shield the ceramic sensing element from silicone and lead contamination, supporting reliable exhaust monitoring and long service life.