Walker 350-33025 Oxygen Sensor - Upstream

Walker 350-33025 Oxygen Sensor for Volvo 940

Walker Products 350-33025 is a heated oxygen sensor built as a specific-fit replacement for select Volvo 940 applications with the Regina Engine Control System. It is designed for the upstream B1S1 position and uses a threaded mount with a 18.0 mm thread diameter for application-specific installation.

Key Features

• Specific-fit heated oxygen sensor for select Volvo 940 models
• Upstream B1S1 placement for Regina Engine Control System applications
• 3-wire design with 20-gauge wiring
• 72.36 in. wiring harness length and 75.91 in. overall length
• Radiused polygon male connector for vehicle-specific connection
• Threaded mounting style with 18.0 mm thread diameter

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors engineered as OE-style replacements for specific vehicle applications. Part number 350-33025 is built to deliver the diagnostic feedback expected by the ECU on the affected Volvo 940 upstream sensor location. For 1994-1995 Volvo 940 vehicles with the Regina Engine Control System, this oxygen sensor supports accurate exhaust monitoring and proper fuel-control feedback. This part number, 350-33025, is listed for the upstream position and should be matched to the exact engine management configuration before installation.

What It Can Help Address

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

Installation Notes and Tips

Fits 1994-1995 Volvo 940, upstream. Confirm Regina Engine Control System coverage, B1S1 placement, connector style, and thread size before installation. Inspect the sensor wiring harness and connector for damage, since physical wear can shorten sensor life and affect operation. Verify the exhaust bung and mounting threads are clean and undamaged so the sensor seats correctly.

Quality Assurance

Walker Products has supplied engine management and fuel system components since 1946 and manufactures this sensor as a specific application replacement. The brand operates under Automotive ISO9001/TS 16949 certification, supporting consistent production and application control.