Subaru Legacy 2000-2001 Oxygen Sensor 22791AA00A Precise Air-Fuel Ratio Detection

Subaru Legacy 2000-2001 oxygen sensor 22791AA00A uses high-purity zirconia ceramic element and heat-resistant stainless steel housing; material grade comparable to OEM; electrode welds reinforced; tested thermal shock resistance about 15% higher; less signal drift at high temperatures. OEM numbers correspond to 22641-AA011, 22641-AA012, 22641-AA01A, 22641-AA01B; fits Legacy 2.5L and 3.0L engines. Function: accurately monitors air-fuel ratio and provides real-time oxygen content signals to ensure efficient combustion.