Walker 250-241313 Oxygen Sensor - Downstream

OE Base Downstream Oxygen Sensor

Walker 250-241313 is a specific-fit downstream oxygen sensor for select Mercedes-Benz applications. It uses a heated narrow-band design with a 4-wire layout and OE-style connector geometry to deliver the feedback the ECU expects from the exhaust system.

Built for direct replacement service, this Walker OE Base Sensor is engineered for the exact application and mounting position. It is a threaded M18 x 1.5 sensor with a 22 mm wrench size, oval female connector, and 565 mm wiring harness length for downstream installation on supported Mercedes-Benz models.

Key Features

• Heated narrow-band oxygen sensor for downstream exhaust monitoring
• Specific-fit design for the listed Mercedes-Benz applications
• 4-wire construction with spade terminals and oval connector
• Threaded M18 x 1.5 mounting with 22 mm wrench size
• Overall length: 598 mm; wiring harness length: 565 mm
• Standard replacement grade for OE-style service

Product Details

Walker Products OE Base Sensor 250-241313 is part of the brand’s engine management sensor line, developed as an OE replacement for vehicle-specific fitment and diagnostic feedback requirements. For downstream oxygen sensor service on Mercedes-Benz models such as C300, GLC300, GLE350, GLB250, CLA250, A220, and AMG variants including C43 AMG and GLE53 AMG, this sensor supports the ECU’s exhaust monitoring strategy with the correct connector, terminal count, and mounting configuration. This part number, 250-241313, is matched to the listed downstream position and is intended for direct replacement use on the applications shown.

This part cross-references Bosch 17025 and Denso 234-9005 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel control caused by inaccurate exhaust feedback
• Increased exhaust emissions from a failing sensor
• Rough engine operation tied to sensor signal issues
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Install only in the downstream position listed for the vehicle. Before replacement, inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals, since physical damage can shorten sensor life. Verify thread size, connector shape, and harness length against the original part before installation. The sensor uses a threaded mount and should be tightened with the correct 22 mm wrench size.

Quality Assurance

Walker Products has manufactured engine management and oxygen/air-fuel sensors since 1946 and operates as an ISO 9001 / TS 16949 certified company. The OE Base Sensor line is built around application-specific fitment and diagnostic feedback requirements for modern ECU-controlled vehicles.