Denso 234-4300 Oxygen Sensor - Downstream

Denso 234-4300 Oxygen Sensor for Suzuki Grand Vitara

Denso 234-4300 is an OE-style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for the downstream position on 2009-2013 Suzuki Grand Vitara models, with the correct threaded mounting, 4-wire configuration, and male connector for a direct service replacement.

Key Features

• OE Style replacement oxygen sensor from Denso
• Heated sensor design for downstream exhaust monitoring
• Specific fit for 2009-2013 Suzuki Grand Vitara, downstream
• 4-wire layout with male connector
• Threaded mounting with 0.708 in. thread diameter
• 19.21 in. wiring harness length for proper routing

OE Style Construction

Denso’s OE Style line is built to match original equipment dimensions and electrical requirements for a direct replacement on the Suzuki Grand Vitara. Part number 234-4300 uses a precision-built design to help ensure correct fitment and stable sensor performance in the downstream exhaust location. Denso also incorporates an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting consistent engine management and fuel control.

This part cross-references Bosch 15294 and Delphi ES20109 for the same application. It also aligns with OE and aftermarket references for the Suzuki Grand Vitara platform, including part number 234-4300.

Common Issues This Sensor Can Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings affecting fuel trim strategy
• Reduced fuel economy caused by a failing heated O2 sensor
• Slow sensor response or intermittent signal output
• Emissions test failure tied to oxygen sensor performance

Installation Notes

Verify the downstream sensor location before ordering and match the connector, thread size, and wire count to the original unit. The threaded mounting style and specific-fit design help simplify replacement on 2009-2013 Suzuki Grand Vitara applications. For best results, inspect the exhaust bung threads and wiring path before installation, and confirm the harness length allows proper routing away from heat sources.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for consistent fit and function. The 234-4300 is built as a direct replacement part for the specified Suzuki Grand Vitara applications, with attention to sensor durability, electrical accuracy, and long-term service life.