Denso 234-4803 Oxygen Sensor - Upstream
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-4803 Oxygen Sensor - Upstream

Brand Denso 234-4803
Position Upstream
Connector Gender Male
Mounting Type Threaded
Sensor Type Heated
Thread Diameter 0.708
Universal Or Specific Fit Specific
Wire Quantity 4
Wiring Harness Length 19.29
Product line OE Style
Fits Toyota · 3 vehicles

OE style replacement. Precision-built for exact replacement and a first-time fit.

Heated sensor. Helps support faster operation and consistent performance.

Threaded mounting. Specific-fit design with a male connector and 4-wire harness.

Cross-references ACDelco 213-2993, BorgWarner OS1569 and Bosch 13619 for the same application. See all 9.

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Denso OE Style Oxygen Sensor for Toyota Celica

Denso 234-4803 is an OE-style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for 2003-2005 Toyota Celica upstream applications and supports accurate exhaust feedback for consistent engine operation.

Key Features

  • Heated oxygen sensor with a specific fit for the upstream position
  • 4-wire design with a male connector for direct replacement
  • Threaded mounting type with a 0.708 in thread diameter
  • 19.29 in wiring harness length for application-specific routing
  • OE Style construction from Denso for precise fit and function

OE Style Construction

Denso’s OE Style line is built to match original equipment dimensions and performance expectations. The sensor uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine performance and fuel efficiency over time. Part number 234-4803 is also referenced by ACDelco 213-2993, Bosch 13619, and NTK 24810 for the same application.

Vehicle Fitment

  • Fits 2003-2005 Toyota Celica, upstream

Common Issues This Sensor Can Address

  • Check engine light related to oxygen sensor performance
  • Incorrect air-fuel mixture feedback from a worn upstream sensor
  • Reduced fuel economy caused by slow sensor response
  • Rough idle or hesitation tied to inaccurate exhaust readings
  • Emissions test failures caused by a failing oxygen sensor

Installation Notes and Tips

Confirm the upstream location before installation and verify connector style, wire count, and thread size against the original sensor. Because this is a specific-fit sensor for the Toyota Celica, compare the harness length and mounting style to the factory unit before final tightening.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit, function, and durability. The design focuses on accurate replacement performance and long service life in the intended Toyota Celica applications.

Related reading

This part fits 3 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2005ToyotaCelicaUpstreamOE Style
2004ToyotaCelicaUpstreamOE Style
2003ToyotaCelicaUpstreamOE Style
Directly replaces or cross-references 9 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 213-2993BorgWarner — OS1569Bosch — 13619NTK — 24810Standard Ignition — SG815Toyota — 8946520820Toyota — 8946520830Walker Products — 250-24747Walker Products — 350-34651