Spectra Premium Oxygen Sensor P/N:OS5410

Keep your engine's fuel management reading accurately with the Spectra Premium Oxygen Sensor OS5410, a direct-fit replacement for the 1999-2001 Subaru Impreza, 1999-2001 Subaru Legacy, and 2000-2001 Subaru Outback. This is a downstream oxygen sensor, mounted after the catalytic converter, where it measures the oxygen content of the exhaust gas so the powertrain control module can monitor how efficiently the converter is working.

• Downstream position: reports post-catalyst exhaust oxygen levels used by the ECM to verify catalyst performance.
• Direct-fit design: installs on the listed Subaru applications to replace a worn or failed original sensor.
• Signals the fuel system: provides the feedback the PCM relies on for closed-loop operation on these vehicles.

Over time an oxygen sensor can slow down or drift, which may set an emissions-related trouble code or a check-engine light. If a failed downstream sensor is the cause, this unit replaces it — diagnose the underlying fault before ordering, since these symptoms can have other causes. Signs the sensor may need replacing include a stored oxygen-sensor or catalyst code and reduced fuel-system response.

Interchange: Manufacturer part number OS5410.