The oxygen sensor installs in the upstream position on 1990-1994 Lexus LS400 and 1992-1995 Lexus SC400 with the 4.0L V8 engine. It signals whether the exhaust is running rich or lean so the engine computer can trim fuel delivery. A built-in heater brings the element to operating temperature quickly after a cold start.

Walker Products 350-34522 Oxygen Sensor Features:

• Fits 1990-1994 Lexus LS400; 1992-1995 Lexus SC400 with the 4.0L V8 engine
• 4-wire narrow-band oxygen sensor
• Built-in heater for fast warm-up
• M18x1.5 threaded mounting with a 22 mm hex, 240 mm (9.4 in.) overall length
• Male square connector at the harness end
• Platinum electrode layer with a protective coating against combustion residue