Replacement SET-REPM960923 Upstream Oxygen Sensor Set 5-Wire Wideband RH & LH

This set includes both the right-hand (RH) and left-hand (LH) sensors, covering the pre-catalytic converter (upstream/Bank 1 and Bank 2) positions.

Wideband oxygen sensors — sometimes referred to as air/fuel ratio sensors — provide a continuous, proportional output signal to the engine control module (ECM), allowing for precise fuel trim management and optimized combustion efficiency. Unlike narrowband sensors, these 5-wire wideband units deliver broader measurement range and faster response times for accurate closed-loop fuel control.

Key Features:

• 5-Wire Wideband Design — delivers precise air/fuel ratio data to the ECM for optimal fuel delivery
• Upstream (Before Catalytic Converter) position — monitors exhaust gases directly from the engine
• Set Includes Both RH and LH Sensors — complete solution for both banks
• OEM Replacement — engineered to meet original equipment specifications and fit
• Heated Element — reaches operating temperature quickly for reliable closed-loop operation
• Restores proper fuel economy, reduces emissions, and clears related check engine codes

A failed upstream oxygen sensor can cause poor fuel economy, rough running, increased emissions, and an illuminated check engine light. Replacing both sensors as a set ensures consistent performance across both exhaust banks.