Denso 234-4240 Oxygen Sensor - Downstream Right or Upstream Left

Denso OE Style Oxygen Sensor 234-4240

Denso 234-4240 is an OE-style heated oxygen sensor built for direct replacement in select Hyundai and Kia applications. It is engineered for a specific fit, threaded mounting, and a 4-wire male connector to match the original sensor layout.

For drivers searching for a Hyundai Genesis oxygen sensor replacement or a Kia Borrego upstream left oxygen sensor, this Denso unit is built to match the original configuration and restore accurate exhaust feedback.

Key Features

• OE Style replacement oxygen sensor for direct-fit service
• Heated sensor design for faster operating response
• Specific fit application with threaded mounting
• 4-wire construction with male connector
• 11.85 in. wiring harness length
• 0.708 in. thread diameter
• Built to OE standards for exact replacement fit
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

Denso 234-4240 is part of the OE Style line, which focuses on direct replacement sensors built to match original equipment fit and function. The sensor is precision built for installation in the correct location and is intended to deliver consistent exhaust monitoring on compatible Hyundai Genesis, Hyundai Equus, Kia Borrego, and Kia Magentis applications. This part cross-references Bosch 18077 for the same application.

By maintaining the correct signal to the engine management system, this oxygen sensor supports proper air-fuel control and helps keep the vehicle operating as intended. It is a practical choice for a 2009-2012 Hyundai Genesis upstream left oxygen sensor replacement or a 2009-2011 Kia Borrego downstream right oxygen sensor replacement.

Common Issues This Part Can Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings
• Reduced fuel economy caused by a failing sensor
• Slow sensor response during closed-loop operation
• Exhaust feedback errors on upstream left or downstream right positions

Installation Notes and Tips

Verify the sensor position, connector style, thread diameter, and harness length before installation. This part is a specific-fit, threaded oxygen sensor, so matching the original location and wiring layout is important for proper installation. Confirm the application against the vehicle’s original sensor configuration for Hyundai Genesis, Hyundai Equus, Kia Borrego, or Kia Magentis.

Quality Assurance

Denso manufactures and tests these oxygen sensors to OE standards and uses an aluminum oxide trap layer to help protect the sensing element from silicone and lead contamination. That construction supports long service life and stable performance in the intended application.