Walker 350-35131 Oxygen Sensor - Upstream

Overview of Walker OE Replacement Oxygen Sensor 350-35131

The Walker OE Replacement Oxygen Sensor 350-35131 is designed specifically for select BMW models, providing accurate air-fuel mixture readings to optimize engine performance and emissions control. This heated, wide-band oxygen sensor ensures reliable operation in demanding conditions.

• Heated oxygen sensor for faster warm-up and accurate readings
• Wide-band sensor type for precise air-fuel ratio measurement
• Specific fit for BMW models including 220i, 320i, 328i, 420i, 520i, X1, X3, X4, X5, and Z4
• Threaded mounting with M18 x 1.5 thread size and 22mm wrench size
• Five-wire design with 20 gauge wire and rectangular male pin connector
• Overall length of 423mm for proper installation depth
• Standard replacement grade ensuring OEM-level performance

Walker OE Replacement Product Line Details

The OE Replacement line by Walker focuses on delivering direct-fit sensors that meet original equipment specifications. This ensures compatibility and performance comparable to factory-installed parts. The 350-35131 oxygen sensor is engineered to match the exact fit and function required by BMW vehicles, supporting emission control systems effectively.

Detailed Product Description

This Walker oxygen sensor features a heated element to reduce sensor warm-up time, enabling quicker feedback to the engine control unit. The wide-band sensor type provides a broad measurement range for accurate air-fuel ratio monitoring, essential for maintaining optimal combustion and reducing emissions. The sensor’s five-wire configuration and pin-type male terminal with a rectangular connector shape ensure secure electrical connections. Designed with a threaded mounting type (M18 x 1.5), it installs easily using a 22mm wrench. The 423mm overall length accommodates proper placement within the exhaust system. This sensor is a specific fit for various BMW models such as the 220i, 320i, 328i, 420i, 520i, and X series vehicles, ensuring precise compatibility.

Common Applications and Issues Addressed

• Restores accurate oxygen sensing for improved fuel efficiency
• Helps resolve engine performance issues related to faulty sensors
• Reduces emissions by providing correct air-fuel ratio data
• Prevents check engine light triggers caused by sensor failure
• Supports smooth engine idling and acceleration response

Installation Notes and Tips

When installing the Walker 350-35131 oxygen sensor, ensure the vehicle is cool to avoid burns. Use a 22mm wrench to remove the old sensor and install the new one with the M18 x 1.5 threaded mount. Verify the connector type matches the vehicle harness for a secure fit. Avoid damaging the sensor wiring during installation. Proper torque specifications should be followed to prevent leaks or sensor damage.

Quality Assurance and Warranty

Walker OE Replacement oxygen sensors are manufactured to meet or exceed OEM standards, providing reliable performance and durability. This part is a standard replacement grade component designed for long-term use in emission control systems. Warranty details are provided by the manufacturer and typically cover defects in materials and workmanship.