Denso 234-2052 Oxygen Sensor - Downstream or Upstream

OE Style Oxygen Sensor for Toyota and Geo

Denso OE Style Oxygen Sensor 234-2052 is a direct-fit emission control sensor built for specific applications on select Toyota, Geo, and GMC vehicles. It uses a 2-wire, non-heated design with a 17.80 in. wiring harness length for the listed upstream and downstream positions.

The OE Style line focuses on exact replacement fitment and OE-level construction. Denso also uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine operation and consistent fuel control.

Key Features

• Part number: 234-2052
• Specific-fit oxygen sensor for listed applications
• Non-heated sensor design
• 2-wire configuration
• 17.80 in. wiring harness length
• OE Style replacement for direct fitment
• Built to OE standards for emission control service

Detailed Product Information

This Denso oxygen sensor is engineered for precise replacement on vehicles that require the correct sensor response for air-fuel management. It is listed for 1991-1995 Toyota Previa, downstream; 1994-1995 Toyota Celica, downstream; 1991-1994 Toyota Tercel, upstream; 1992-1994 Toyota Paseo, upstream; 1995 Toyota Paseo, upstream; 1993-1995 Toyota Corolla, upstream excluding California; and 1993-1995 Geo Prizm, upstream excluding California. The 234-2052 application coverage also includes select OE cross-reference numbers for the same use case.

This part cross-references Bosch 12201 and NTK 24511 for the same application.

Common Issues This Part Can Address

• Faulty oxygen sensor readings that affect fuel mixture control
• Check engine light concerns related to sensor performance
• Reduced fuel economy caused by inaccurate exhaust feedback
• Rough idle or drivability issues tied to emission sensor wear
• Slow or inconsistent sensor response in the exhaust stream

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for both upstream and downstream locations depending on vehicle application. Confirm the connector style, wire count, and harness length against the original sensor on your Toyota Corolla, Toyota Paseo, Toyota Previa, Toyota Tercel, Toyota Celica, or Geo Prizm. For best results, inspect the exhaust threads and wiring routing during installation.

Quality Assurance

Denso manufactures and tests OE Style oxygen sensors to OE standards for accurate replacement fitment and dependable service. The design includes contamination protection for the sensing element, helping maintain sensor integrity in demanding exhaust conditions.