Subaru Forester Impreza Oxygen Sensor 22641-AA670 22641AA670

Subaru Forester (2009–2013 2.5L) and Impreza (2008–2014 2.0L/2.5L) dedicated oxygen sensor 22641-AA670, precisely matching OEM specs. Monitors exhaust oxygen content and feeds ECU to optimize air-fuel ratio, improving fuel economy and reducing emissions. OEM number 22641-AA670 (cross-check 22641AA670) ensures compatibility. Replacement difficulty moderate; use a dedicated socket for removal; apply anti-seize before installation.