Denso 234-4151 Oxygen Sensor - Upstream

OE Style Oxygen Sensor for Toyota Applications

This Denso OE Style oxygen sensor is a specific-fit replacement built for direct installation on select Toyota models. It uses a heated, 4-wire design with a 12.60-inch wiring harness length to match the original sensor layout and restore accurate exhaust feedback.

Key Features

• OE Style replacement from Denso
• Heated oxygen sensor design for faster operating response
• Specific fit for direct application matching
• 4-wire configuration
• 12.60-inch wiring harness length
• Built and tested to OE standards for exact replacement fit
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

Denso Part Number 234-4151 is engineered as an OE-style oxygen sensor for Toyota T100, Toyota 4Runner, and Toyota Pickup applications listed below. The sensor is designed to deliver the correct signal to the engine management system, helping maintain proper air-fuel control, emissions performance, and fuel economy. Denso’s OE-focused construction emphasizes first-time fit and consistent sensor response, making this a practical replacement for worn or slow-reacting upstream sensors. This part cross-references Bosch 13198 and NTK 24552 for the same application.

The Denso OE Style line is built around exact replacement geometry and sensor performance. Its protective trap layer is intended to reduce contamination damage to the sensing element, which supports longer service life in demanding exhaust environments. If you are replacing an upstream oxygen sensor on a Toyota T100, 4Runner, or Pickup, Part Number 234-4151 provides a direct-fit solution that aligns with the original equipment design.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent fuel control from a slow sensor signal
• Reduced fuel economy caused by inaccurate exhaust feedback
• Failed emissions testing tied to upstream sensor issues
• Contamination-related sensor degradation from silicone or lead exposure

Installation Notes and Tips

• Fits 1993-1997 Toyota T100, upstream
• Fits 1993-1995 Toyota 4Runner, upstream; California exempt parts can be used on pollution controlled vehicles in California
• Fits 1993-1995 Toyota Pickup, upstream; Japan built; Calif.
• Confirm connector style, harness routing, and upstream location before installation
• Inspect the exhaust threads and wiring path during replacement to avoid damage to the new sensor

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for fit, function, and durability. The OE Style design is intended to provide the correct replacement part for the listed Toyota applications, with attention to sensor accuracy and long-term reliability.