Walker Products 250-25085 Oxygen Sensor 5-Wire Wideband Air-Fuel Ratio

The Walker Products 250-25085 is a 5-wire wideband oxygen sensor (O2 sensor / air-fuel ratio sensor) engineered as a direct OEM replacement for precise exhaust gas monitoring and engine management system feedback. Designed to restore accurate air-fuel ratio readings, this sensor helps the ECU optimize combustion efficiency, maintain fuel economy, and reduce exhaust emissions.

Walker's wideband sensor lineup features a 100% OE base sensor program, built with a dual OEM shield, dual lower shield design, ceramic sensing element, laser-welded body and shield construction, high-temperature sleeving, and a plasma-sprayed protective coating — delivering reliable, long-lasting performance in demanding exhaust environments.

Key Features:

• 5-wire wideband / air-fuel ratio (A/F) sensor design
• 100% OE-matched fit, form, and function for direct replacement
• Dual OEM shield with dual lower shield for maximum protection
• Ceramic sensing element with laser-welded body and shield
• High-temperature sleeving and plasma-sprayed protective coating
• Corrosion-resistant construction for extended service life
• Engineered, assembled, and 100% performance tested in the USA
• Meets or exceeds all original equipment specifications and test requirements

A failing wideband oxygen sensor can trigger a Check Engine / MIL (Malfunction Indicator Light), cause poor engine performance, increased fuel consumption, and elevated exhaust emissions. The Walker Products 250-25085 restores proper sensor function and ECU feedback, helping to clear fault codes and return the engine management system to factory performance. Compatible O2 Bung repair kits are also available separately for damaged or seized bung threads.