Walker 350-35091 Oxygen Sensor - Upstream

Overview of Walker Oxygen Sensor 350-35091

The Walker 350-35091 oxygen sensor is designed specifically for select BMW and Mini models, providing precise emission control and engine performance monitoring. This heated oxygen sensor features a threaded mounting type and a radiused polygon male connector for secure installation.

• Heated oxygen sensor for accurate emissions feedback
• Specific fit for BMW and Mini vehicles including 135i, 335i, 640i, Cooper, and more
• 27.09-inch wiring harness length with 5 wires of 20 gauge
• Thread diameter of 18.0 mm with threaded mounting
• Radiused polygon male connector for reliable connection
• Overall length of 30.63 inches for proper fitment

Detailed Product Description

This Walker Products Aftermarket oxygen sensor (part number 350-35091) is engineered to meet the exact specifications required by BMW and Mini vehicles such as the 135i, 335i xDrive, 640i Gran Coupe, and Cooper Countryman. The sensor’s heated design allows it to reach optimal operating temperature quickly, improving fuel efficiency and reducing emissions. The 5-wire configuration with 20 gauge wiring ensures stable signal transmission, while the 27.09-inch wiring harness length provides sufficient reach for proper installation. The radiused polygon male connector and 18.0 mm threaded mounting type guarantee a secure and precise fit, minimizing the risk of leaks or sensor failure.

Compatible Vehicles and Applications

This oxygen sensor is compatible with a range of BMW and Mini models, including but not limited to:

• BMW 135i, 135is, M135i
• BMW 220i, 335i, 335i GT xDrive, 335i xDrive
• BMW 535i xDrive, 640i, 640i Gran Coupe, 640i xDrive Gran Coupe
• BMW 740i, 740Li, 740Li xDrive, ActiveHybrid 3
• Mini Cooper, Cooper Clubman, Cooper Countryman, X1, X2, X3, X4

Common Issues Addressed by This Oxygen Sensor

• Incorrect air-fuel mixture readings causing poor fuel economy
• Check engine light triggered by faulty oxygen sensor signals
• Increased emissions due to sensor malfunction
• Engine performance issues such as rough idling or hesitation
• Failed emissions tests related to sensor degradation

Installation Notes and Tips

When installing the Walker 350-35091 oxygen sensor, ensure the vehicle is cool to avoid burns. Use appropriate tools to remove the old sensor and avoid damaging the wiring harness. Verify the connector shape and thread diameter match the vehicle’s specifications. Properly torque the sensor to the manufacturer’s recommended settings to prevent leaks. It is advisable to inspect the wiring harness for any damage before installation.

Quality Assurance and Warranty

Walker Products Aftermarket parts are manufactured to meet or exceed OEM standards, ensuring reliable performance and durability. The 350-35091 oxygen sensor undergoes rigorous quality control to maintain consistency and fitment accuracy. While specific warranty details may vary, Walker typically offers coverage against defects in materials and workmanship for a defined period. Consult product documentation or the supplier for exact warranty terms.