Walker 250-241329 Oxygen Sensor - Downstream or Upstream

Walker OE Base Oxygen Sensor

Walker OE Base Sensor 250-241329 is a heated narrow-band oxygen sensor built for specific OE-style replacement applications. It provides the ECU with the exhaust feedback needed for fuel control and emissions monitoring on select Audi models, including Audi Q5, Audi Q5 PHEV, Audi Q7, and Audi A6 Quattro.

The OE Base Sensor line focuses on application-specific fitment and sensor position, helping match the original sensor location and connector style for the vehicle. Part number 250-241329 is engineered for downstream and upstream positions where listed, with a 4-wire heated design and M18 x 1.5 thread size.

Key Features

• Heated narrow-band oxygen sensor for OE-style replacement
• Application-specific fitment for listed Audi vehicles and positions
• 4-wire design with oblong female connector
• Spade terminals, 4 terminal quantity, male terminal gender
• M18 - 1.5 thread size for proper exhaust bung fitment
• Walker OE Base Sensor line for direct replacement coverage

Detailed Description

Walker Products 250-241329 is an oxygen sensor designed to restore exhaust gas feedback to the engine control unit on select Audi applications. This narrow-band sensor is heated for faster operating temperature and stable signal delivery, supporting the ECU’s ability to manage air-fuel ratio and emissions strategy. It is listed for 2020-2025 Audi Q5 PHEV downstream, 2021-2022 Audi Q7 upstream, 2019-2020 Audi A6 Quattro downstream, 2020 Audi Q5 downstream, and 2019 Audi Q5 downstream from 11/13/2018.

Walker’s OE Base Sensor line is built around specific vehicle application, fitment position, and diagnostic feedback requirements. If the original sensor has failed or the connector, wiring harness, or sensor body is damaged, replacement with the correct part number helps restore proper signal input for the vehicle’s emissions system. Part number 250-241329 is a direct-fit style option for the listed Audi Q5, Audi Q7, and Audi A6 Quattro applications.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Poor engine operation caused by incorrect exhaust feedback
• Increased fuel consumption from inaccurate air-fuel control
• Elevated exhaust emissions from a failing sensor signal
• Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Confirm the vehicle year, model, and sensor position before ordering. This part number is listed for both upstream and downstream locations depending on application, so match the original sensor placement exactly. Inspect the sensor connector, wiring harness, and surrounding exhaust components for heat damage, corrosion, or physical wear before installation. Verify thread size and connector shape against the original unit to ensure proper fitment.

Quality Assurance

Walker Products has manufactured engine management and oxygen sensor components since 1946 and operates as an ISO 9001/TS 16949 certified company. The OE Base Sensor line is developed as an OE-style replacement solution for specific vehicle applications, including the listed Audi fitments for part number 250-241329.