Oxygen Sensor 4 Wire for Mercedes-Benz W203 W204 W211 W212 C209 SLK R171 CLK A209

Meet the Mercedes Benz Oxygen Sensor 4 Wire, a precise, OE-style replacement built for durability and accurate emissions control. Designed to fit a wide range of Mercedes-Benz models, this sensor supports models including W203, W204, W211, W212, C209, SLK, R171, and CLK A209, making it a versatile choice for maintenance and repair projects.

The four-wire configuration delivers reliable signal transmission to the engine control unit, helping your vehicle maintain optimal air-fuel balance, improve fuel efficiency, and reduce emissions. This sensor features a heated design to reach operating temperature quickly, delivering accurate readings even during cold starts and under varying driving conditions. The sensing element is described as piezoelectric in the data, emphasizing a robust sensing technology tuned for consistent performance over time.

OEM reference A0025400617 ensures compatibility with the parts you expect for Mercedes-Benz vehicles, supporting straightforward installation and dependable integration with your existing exhaust and ECU systems. This product is manufactured to meet the specifications of the listed MB models, providing a reliable replacement that helps keep your engine running smoothly and efficiently.

Whether you’re tackling routine maintenance, preparing for an emissions check, or restoring peak performance, this oxygen sensor supports proper engine management by delivering precise oxygen readings to the ECU. A correctly functioning sensor contributes to cleaner exhaust, steadier idle, and smoother acceleration—helping your vehicle run as it should.

Benefits & Tips

• Use during routine maintenance to restore fuel trim accuracy and improve overall fuel economy.
• Install after a failed sensor to prevent cascading faults in the engine management system and to pass emissions testing more reliably.
• Keep a maintenance schedule: after replacing, monitor for improved idle stability and reduced check-engine-light events.

Product specifications

• Sensor Type: Piezoelectric
• Wire Configuration: 4-wire
• Compatible Models: Mercedes-Benz W203, W204, W211, W212, C209, SLK, R171, CLK A209
• OEM Part Number: A0025400617
• Origin: Mainland China
• Hysteresis: A0025400617 | 0258006475
• Resolution: A0015403817
• Heating: Yes (heated sensor)

Package includes:

• 1 x Mercedes Benz Oxygen Sensor 4-Wire (for listed MB models)

Warnings/Reminders

• Ensure compatibility with your specific Mercedes-Benz model and year before installation.
• Professional installation is recommended to ensure proper fit and sealing in the exhaust system.
• Disconnect the battery and follow vehicle service procedures when replacing exhaust sensors.

Language support: Not listed in current product data.

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