Denso 234-4051 Oxygen Sensor - Downstream, Upstream or Upstream Left

OE-Style Oxygen Sensor for Toyota and Lexus

Denso 234-4051 is an OE-style heated oxygen sensor built for direct replacement on select Toyota and Lexus applications. It is engineered for exact fitment, stable signal performance, and reliable exhaust monitoring on vehicles such as the Toyota Camry, Toyota Pickup, Toyota Celica, Toyota MR2, Toyota Land Cruiser, and Lexus ES250.

Key Features

• Heated oxygen sensor with 4-wire design
• Specific-fit replacement for direct installation
• 14.80-inch wiring harness length
• OE-style construction for factory-style fit and function
• Built to strict OE standards for consistent sensor output
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

The Denso OE Style line is designed as a direct replacement solution for drivers who want factory-style fitment without modification. Part number 234-4051 is precision built to match the original sensor location and connector style on supported vehicles, helping maintain accurate exhaust feedback for engine management. This Denso oxygen sensor is a practical choice for emissions service on 1988-1992 Toyota and Lexus models, including applications where the upstream sensor position is critical to fuel control.

This part cross-references Bosch 13405 and NTK 24536 for the same application.

Vehicle Fitment

• Fits 1990-1992 Toyota Land Cruiser, Upstream Left, OE Style
• Fits 1990-1991 Lexus ES250, Upstream, Excluding California; OE Style
• Fits 1988-1991 Toyota Camry, Upstream, Excluding California; OE Style
• Fits 1989-1991 Toyota Pickup, Upstream, OE Style
• Fits 1989-1991 Toyota Pickup, Downstream, Calif.; Long Bed; OE Style
• Fits 1989-1990 Toyota Pickup, Upstream, w/ 14" Sensor; OE Style
• Fits 1988-1989 Toyota Celica, Upstream, OE Style
• Fits 1988-1989 Toyota MR2, Upstream, OE Style

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent air-fuel feedback
• Reduced fuel economy from an aging upstream sensor
• Slow sensor response affecting emissions control
• Failed emissions inspection caused by a worn oxygen sensor

Installation Notes and Tips

Confirm the sensor position, connector style, and harness length before installation. This is a specific-fit heated oxygen sensor, so it should be matched to the exact year, make, model, and position listed above. Inspect the exhaust threads and wiring routing during replacement, and verify the sensor is installed in the correct upstream or downstream location for the application.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and dependable operation. The OE-style design and contamination-resistant trap layer support long-term sensor durability in demanding exhaust environments.