Compatibility : 2004 Subaru Legacy 2.5L 2004 Subaru Outback 2.5L Features: Porous PTFE Filter - Allows atmospheric oxygen to enter the sensor without permitting water or engine contaminants to seep into the casing. Double Protection Cover - Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning. Stainless Steel Housing - Resists corrosion and contamination with a rugged, watertight body. Aluminum-Oxide Trap Layer - Keeps silicone and lead outside the ceramic elient through, preventing damage to the platinum electrode. .
