Denso 234-2055 Oxygen Sensor - Upstream

OE-Style Oxygen Sensor for Toyota Corolla

This Denso oxygen sensor is an OE-style replacement built for precise fit and consistent signal performance. It is a specific-fit, non-heated sensor for the upstream position on 1990-1992 Toyota Corolla applications, including Toyota Corolla oxygen sensor replacement searches for the correct factory-style match.

Key Features

• OE Style replacement from Denso for direct-fit service
• Specific fit for 1990-1992 Toyota Corolla, upstream
• Non-heated sensor design
• 2-wire configuration with 16.93-inch wiring harness length
• Built and tested to OE standards for accurate replacement fitment
• Aluminum oxide trap layer helps protect the sensing element from silicone and lead contamination

Product Details

Denso Part Number 234-2055 is engineered as a factory-style oxygen sensor for the upstream location on 1990, 1991, and 1992 Toyota Corolla models. The OE Style line focuses on exact replacement dimensions and first-time fit, making it a practical choice when replacing a worn sensor on a Toyota Corolla upstream oxygen sensor application. This part cross-references Bosch 12202 and NTK 24512 for the same application.

The sensor uses a non-heated, 2-wire design and includes a 16.93-inch harness length to match the original routing requirements. Denso’s protective trap layer is designed to help shield the ceramic sensing element from contamination that can affect engine operation and fuel control. If you are searching for Denso 234-2055 or a Toyota Corolla upstream oxygen sensor, this part is built for that exact vehicle range.

Common Problems This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent air-fuel mixture control
• Reduced fuel economy caused by an aging upstream sensor
• Slow sensor response during closed-loop operation
• Failed emissions testing tied to sensor degradation

Installation Notes and Tips

Verify the upstream sensor location before installation and compare the connector, wire count, and harness length to the original part. On 1990-1992 Toyota Corolla models, confirm that the vehicle uses the non-heated, specific-fit configuration before ordering Denso 234-2055. Inspect the exhaust threads and wiring route during replacement to help ensure proper sensor placement and signal performance.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent replacement quality and fit. The OE Style product line is built around exact replacement specifications, helping deliver the correct part for the correct application on Toyota Corolla models.