Walker 250-241091 Oxygen Sensor - Downstream
OE Base Oxygen Sensor for Audi Q3
Walker OE Base Sensor 250-241091 is a direct-fit downstream oxygen sensor for select Audi Q3 applications. Built as a standard replacement narrow-band sensor, it provides the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring.
Key Features
- Specific-fit downstream oxygen sensor for select Audi Q3 models
- Heated narrow-band design for OE-style signal response
- 4-wire configuration with female D-shaped connector
- Threaded M18 x 1.5 mounting with 22 mm wrench size
- Wiring harness length: 825.00; overall length: 858.00
- Walker OE Base Sensor line for standard replacement applications
Product Details
Walker Products OE Base Sensor 250-241091 is engineered as an original-equipment replacement oxygen sensor for the downstream position. It is listed for 2019-2021 Audi Q3, downstream; 2022-2023 Audi Q3, downstream, B1S2; OE Base Sensor; and 2024-2025 Audi Q3, downstream, OE Base Sensor. This part number is built for the specific application and fitment position so the ECU receives the correct diagnostic feedback from the exhaust stream. The Walker OE Base Sensor line focuses on application-specific replacement parts for engine management systems, and 250-241091 follows that approach for Audi Q3 service work.
This part cross-references Bosch 17098 for the same application.
Common Issues This Sensor May Address
- Check engine light related to downstream oxygen sensor performance
- Incorrect fuel trim readings caused by a failing exhaust sensor
- Higher fuel consumption from inaccurate ECU feedback
- Increased exhaust emissions from degraded sensor response
- Poor engine operation when the sensor, wiring, or connector is damaged
Installation Notes
Confirm the vehicle year, engine configuration, and downstream sensor position before ordering. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before installation. Because this is a threaded sensor with a D-shaped connector and 4-wire layout, verify connector orientation and thread engagement during replacement. For 2024-2025 Audi Q3 and earlier listed Audi Q3 applications, match the OE Base Sensor position exactly to avoid diagnostic faults.
Quality Assurance
Walker Products manufactures engine management and oxygen/air-fuel sensors as OE-style replacement components and operates under ISO 9001/TS 16949 certification. The brand has supplied sensor and fuel system components since 1946, with application-specific cataloging and fitment control for modern vehicle service.
Walker 250-241091 Oxygen Sensor - Downstream
OE Base Oxygen Sensor for Audi Q3
Walker OE Base Sensor 250-241091 is a direct-fit downstream oxygen sensor for select Audi Q3 applications. Built as a standard replacement narrow-band sensor, it provides the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring.
Key Features
- Specific-fit downstream oxygen sensor for select Audi Q3 models
- Heated narrow-band design for OE-style signal response
- 4-wire configuration with female D-shaped connector
- Threaded M18 x 1.5 mounting with 22 mm wrench size
- Wiring harness length: 825.00; overall length: 858.00
- Walker OE Base Sensor line for standard replacement applications
Product Details
Walker Products OE Base Sensor 250-241091 is engineered as an original-equipment replacement oxygen sensor for the downstream position. It is listed for 2019-2021 Audi Q3, downstream; 2022-2023 Audi Q3, downstream, B1S2; OE Base Sensor; and 2024-2025 Audi Q3, downstream, OE Base Sensor. This part number is built for the specific application and fitment position so the ECU receives the correct diagnostic feedback from the exhaust stream. The Walker OE Base Sensor line focuses on application-specific replacement parts for engine management systems, and 250-241091 follows that approach for Audi Q3 service work.
This part cross-references Bosch 17098 for the same application.
Common Issues This Sensor May Address
- Check engine light related to downstream oxygen sensor performance
- Incorrect fuel trim readings caused by a failing exhaust sensor
- Higher fuel consumption from inaccurate ECU feedback
- Increased exhaust emissions from degraded sensor response
- Poor engine operation when the sensor, wiring, or connector is damaged
Installation Notes
Confirm the vehicle year, engine configuration, and downstream sensor position before ordering. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before installation. Because this is a threaded sensor with a D-shaped connector and 4-wire layout, verify connector orientation and thread engagement during replacement. For 2024-2025 Audi Q3 and earlier listed Audi Q3 applications, match the OE Base Sensor position exactly to avoid diagnostic faults.
Quality Assurance
Walker Products manufactures engine management and oxygen/air-fuel sensors as OE-style replacement components and operates under ISO 9001/TS 16949 certification. The brand has supplied sensor and fuel system components since 1946, with application-specific cataloging and fitment control for modern vehicle service.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
OE Base Oxygen Sensor for Audi Q3
Walker OE Base Sensor 250-241091 is a direct-fit downstream oxygen sensor for select Audi Q3 applications. Built as a standard replacement narrow-band sensor, it provides the ECU with the exhaust feedback needed for proper fuel control and emissions monitoring.
Key Features
- Specific-fit downstream oxygen sensor for select Audi Q3 models
- Heated narrow-band design for OE-style signal response
- 4-wire configuration with female D-shaped connector
- Threaded M18 x 1.5 mounting with 22 mm wrench size
- Wiring harness length: 825.00; overall length: 858.00
- Walker OE Base Sensor line for standard replacement applications
Product Details
Walker Products OE Base Sensor 250-241091 is engineered as an original-equipment replacement oxygen sensor for the downstream position. It is listed for 2019-2021 Audi Q3, downstream; 2022-2023 Audi Q3, downstream, B1S2; OE Base Sensor; and 2024-2025 Audi Q3, downstream, OE Base Sensor. This part number is built for the specific application and fitment position so the ECU receives the correct diagnostic feedback from the exhaust stream. The Walker OE Base Sensor line focuses on application-specific replacement parts for engine management systems, and 250-241091 follows that approach for Audi Q3 service work.
This part cross-references Bosch 17098 for the same application.
Common Issues This Sensor May Address
- Check engine light related to downstream oxygen sensor performance
- Incorrect fuel trim readings caused by a failing exhaust sensor
- Higher fuel consumption from inaccurate ECU feedback
- Increased exhaust emissions from degraded sensor response
- Poor engine operation when the sensor, wiring, or connector is damaged
Installation Notes
Confirm the vehicle year, engine configuration, and downstream sensor position before ordering. Inspect the sensor wiring harness and connector for heat damage, corrosion, or broken terminals before installation. Because this is a threaded sensor with a D-shaped connector and 4-wire layout, verify connector orientation and thread engagement during replacement. For 2024-2025 Audi Q3 and earlier listed Audi Q3 applications, match the OE Base Sensor position exactly to avoid diagnostic faults.
Quality Assurance
Walker Products manufactures engine management and oxygen/air-fuel sensors as OE-style replacement components and operates under ISO 9001/TS 16949 certification. The brand has supplied sensor and fuel system components since 1946, with application-specific cataloging and fitment control for modern vehicle service.
