Denso 234-4649 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4649

Denso 234-4649 is a heated oxygen sensor built to OE-style specifications for direct replacement on select Chevrolet, Suzuki, Geo, and Pontiac applications. It uses a specific-fit, threaded design with a 4-wire male connector and a 24.41 in. wiring harness for a precise match to the original sensor location.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific-fit replacement for direct installation on listed vehicles
• Threaded mounting type with 0.708 in. thread diameter
• 4-wire design with male connector
• 24.41 in. wiring harness length
• OE Style construction for factory-like fit and function

OE Style Design and Performance

Denso’s OE Style line is built around exact replacement fitment and factory-style performance. The sensor element is protected by an aluminum oxide trap layer that helps shield the ceramic element from silicone and lead contamination, supporting stable exhaust feedback and consistent engine management. For drivers servicing a 1996-1998 Suzuki Sidekick, 1999-2000 Chevrolet Tracker, or 1996-1997 Geo Tracker, this Denso oxygen sensor provides the correct downstream configuration for the listed applications. Part number 234-4649 is also referenced in OE-style replacement searches for these vehicles.

This part cross-references Bosch 13035 and NTK 21509 for the same application.

What This Oxygen Sensor Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback from a worn sensor
• Reduced fuel economy caused by slow sensor response
• Emissions test failures tied to exhaust monitoring faults
• Rougher engine operation from inaccurate exhaust readings

Installation Notes and Fitment

Compatible With 1999-2000 Chevrolet Tracker, downstream, excluding California; 1999-2000 Suzuki Vitara, downstream, excluding California; 1998 Chevrolet Tracker, downstream; 1996-1998 Suzuki Sidekick, downstream; 1996-1998 Suzuki X-90, downstream; 1996-1997 Geo Tracker, downstream; and 1996-1997 Pontiac Sunrunner, downstream. Verify connector style, thread size, and harness routing against the original sensor before installation. Because this is a specific-fit threaded sensor, proper exhaust thread condition and secure connector engagement are important for accurate installation. Denso 234-4649 is commonly searched for downstream replacement on Chevrolet Tracker and Suzuki Vitara applications.

Quality Assurance

Denso manufactures and tests these oxygen sensors to OE standards for consistent replacement quality and first-time fit. The brand’s OE-style engineering focus supports dependable sensor response and long service life in the listed applications.