Walker 350-34033 Oxygen Sensor - Upstream or Upstream Right

Walker 350-34033 Oxygen Sensor for Mitsubishi

Walker Products 350-34033 is a heated oxygen sensor built as an OE-style replacement for specific Mitsubishi applications. It is engineered for the correct fitment position and ECU feedback on vehicles such as the Mitsubishi Montero, Montero Sport, and Lancer.

Key Features

• Heated oxygen sensor for upstream monitoring
• Specific fit design for the listed Mitsubishi applications
• 4-wire configuration with a 20-gauge harness
• Threaded mounting with 18.0 mm thread diameter
• Radiused polygon male connector for proper electrical connection
• Wiring harness length: 26.1 in.; overall length: 29.65 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as replacement parts for original equipment applications. Part number 350-34033 is intended for upstream sensor locations and is built to provide the diagnostic feedback the ECU expects. For Mitsubishi Montero and Mitsubishi Lancer applications, correct upstream sensor operation is important for fuel control, emissions monitoring, and fault-code management.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Used For

• Check engine light related to upstream oxygen sensor performance
• Poor fuel economy caused by incorrect air-fuel feedback
• Elevated exhaust emissions from a failing heated oxygen sensor
• Rough engine operation tied to sensor signal loss
• Stored ECU fault codes for the affected sensor circuit

Installation Notes

Fits 2017-2019 Mitsubishi Montero, upstream right; 2009-2015 Mitsubishi Montero, upstream right; 2008 Mitsubishi Montero, upstream right; 2005-2008 Mitsubishi Montero Sport, upstream right; 2005-2006 Mitsubishi Lancer, upstream; 2003 Mitsubishi Lancer, upstream; 2001-2006 Mitsubishi Montero, upstream right; 2004 Mitsubishi Lancer, upstream; 2001-2004 Mitsubishi Montero Sport, upstream right; and 1999-2000 Mitsubishi Montero Sport, upstream right. Confirm the sensor location, connector shape, and thread size before installation. Inspect the sensor, wiring harness, and connector for physical damage, since damaged components can shorten service life and affect readings.

Quality Assurance

Walker Products states that its engine management and oxygen/air-fuel sensors are developed for OE replacement use and manufactured under Automotive ISO9001/TS 16949 quality systems. Since 1946, Walker Products has supplied engine management sensors and fuel system components for vehicle applications worldwide.