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.
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.
Is this an upstream or downstream oxygen sensor?
It is a downstream sensor, mounted after the catalytic converter to measure post-catalyst exhaust oxygen for the ECM.
Which vehicles does the OS5410 fit?
It is a direct-fit replacement for the 1999-2001 Subaru Impreza, 1999-2001 Subaru Legacy, and 2000-2001 Subaru Outback. See the Buyer's Guide tab to confirm your vehicle.
What does a downstream oxygen sensor do?
It measures the oxygen content of exhaust gas after the catalytic converter, giving the PCM feedback used to monitor catalyst efficiency.
Why might I need to replace this sensor?
A slow or failed downstream sensor can set an emissions or catalyst trouble code. If that sensor is the cause, this replaces it; diagnose the fault first.
What is the manufacturer part number?
The Spectra Premium manufacturer part number is OS5410.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
