0065422018 Rear Oxygen Sensor for Mercedes-Benz C-Class W204 C350

◆ This rear oxygen sensor is a direct replacement for the original Mercedes-Benz unit, designed to measure oxygen concentration in the exhaust after the catalytic converter.

◆ The OEM reference number is 0065422018 (also written as A0065422018). Mercedes-Benz catalog description identifies it as “Oxygen sensor diagnostic sensor downstream of left and right” .

◆ The sensor is a heated type unit engineered to OEM standard dimensions for direct fitment into the downstream exhaust location. Aftermarket reference data lists a 4-pin connector and M18x1.5 thread for compatible equivalents .

◆ It is primarily designed for Mercedes-Benz models including the C-Class W204 (C350), with compatibility data also listing various other Mercedes-Benz, Maybach, Smart, and Chrysler applications .

◆ This product is an oxygen sensor manufactured to meet original quality standards for signal accuracy, fit, and durability.

◆ Part Number: 0065422018 / A0065422018

◆ Component Type: Oxygen Sensor / Lambda Sensor (Rear/Downstream)

◆ Vehicle Make: Mercedes-Benz

◆ Primary Fitment: C-Class W204 (C350)

◆ Position: Downstream of left and right catalytic converter

◆ Connector: 4-pin (compatible equivalent specification)

◆ Thread Size: M18 x 1.5

◆ Note: Verify connector shape and specific engine variant against your vehicle’s original sensor before ordering

◆ OEM Standard Fit: Manufactured to exact original specifications for a direct, hassle-free replacement.

◆ Downstream Monitoring: Measures oxygen content after the catalytic converter to determine converter efficiency and support emissions compliance.

◆ Heated Design: Integrated heater brings the sensor to operating temperature quickly for efficient closed-loop operation.

◆ Durable Construction: Built with materials resistant to exhaust heat, contamination, and vibration.

◆ Mercedes-Benz C-Class W204 (C350): 2014–2021 (compatibility data from aftermarket listings)

◆ Additional cross-reference data lists various Mercedes-Benz, Maybach, Smart, and Chrysler applications

◆ Note: Fitment varies by engine variant and market. Verify against your vehicle’s original part number and production year before ordering. The C-Class W204 compatibility data from aftermarket sources should be confirmed against your specific vehicle configuration.

Q1: Is this a genuine Mercedes-Benz part?

A: The 0065422018 / A0065422018 reference is the original equipment part number. Both genuine Mercedes-Benz and aftermarket equivalents (such as Denso DOX-1737) are available that match the original fit and function .

Q2: How do I confirm if it fits my vehicle?

A: Check your vehicle’s existing oxygen sensor. If it is stamped with 0065422018 or A0065422018, this replacement will fit. Also confirm your vehicle model and engine variant against the compatibility data above. Note that this is a downstream (rear) sensor positioned after the catalytic converter .

Q3: What are the symptoms of a failing downstream oxygen sensor?

A: Common signs include a check engine light with oxygen sensor or catalytic converter efficiency fault codes, decreased fuel economy, and failed emissions testing. A diagnostic scan can confirm which sensor circuit is faulty before replacement. Note that downstream sensor codes can also be triggered by a failing catalytic converter itself.