Denso 234-4175 Oxygen Sensor - Downstream, Downstream Left, Upstream or Upstream Right

Denso OE Style Oxygen Sensor 234-4175

Denso 234-4175 is a heated, specific-fit oxygen sensor built to OE-style dimensions for direct replacement on select Mercedes-Benz applications. It is engineered for accurate exhaust feedback, stable engine management, and a first-time fit on vehicles such as the Mercedes-Benz E320, S500, and SL500.

Key Features

• Heated oxygen sensor for faster operating readiness
• Specific-fit design for direct replacement
• 4-wire configuration with female connector
• Threaded mounting with 0.708 in. thread diameter
• 24.41 in. wiring harness length
• OE Style construction for factory-style fit and function

OE Style Construction

The Denso OE Style line is built to match original equipment requirements for fit and performance. This sensor uses precision-built components for exact replacement, and Denso’s aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination. That design supports consistent signal output, improved fuel control, and longer service life in demanding exhaust environments. Part number 234-4175 is a direct replacement choice for Mercedes-Benz oxygen sensor service where OE-style fitment matters.

This part cross-references Bosch 13642 and NTK 25564 for the same application.

What It Helps Fix

• Check engine light caused by a failing oxygen sensor
• Rough idle or inconsistent air-fuel readings
• Reduced fuel economy from inaccurate exhaust feedback
• Slow sensor response during closed-loop operation
• Emissions test failures related to sensor performance

Installation Notes

Compatible With select Mercedes-Benz applications including 1997-2000 E320 upstream and downstream, 1996-2000 S500 upstream and 1996-1999 S500 downstream left, 2000-2002 SL500 upstream right, and 1999-2002 SL500 downstream. Also fits 1997-2000 C230 downstream, 1998-2000 E430 upstream, 1999-2000 E55 AMG upstream, and other listed Mercedes-Benz positions. Verify the connector, thread size, and sensor location before installation. Use the vehicle’s exact position callout, such as upstream, downstream, or left/right placement, to confirm the correct application.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for replacement accuracy and dependable operation. The OE-style design, heated sensor construction, and contamination-resistant element protection reflect Denso’s focus on factory-level fit and consistent performance.