Keep your engine's air-fuel control on target with the Spectra Premium Oxygen Sensor OS5266. This is the upstream (pre-catalytic-converter) oxygen sensor, and it drops in as a direct-fit replacement for the 1984-1987 Honda Civic and the 1984 and 1986-1987 Honda Wagovan.
An upstream oxygen sensor sits in the exhaust ahead of the catalytic converter and reads the oxygen content of the exhaust stream. It generates a voltage signal the engine control unit uses to trim fuel delivery and hold the air-fuel ratio near the target, which supports normal fuel economy and emissions performance.
If a worn or contaminated upstream oxygen sensor is the cause of a rough idle, poor fuel economy, or an illuminated check engine light, installing the OS5266 returns proper exhaust-oxygen sensing. Diagnose the underlying cause before replacing, as these symptoms can have other sources.
Manufacturer part number OS5266.
What does this oxygen sensor do?
It reads the oxygen content in the exhaust and sends a voltage signal to the engine control unit, which uses it to trim fuel delivery and hold the air-fuel ratio near target.
Is this an upstream or downstream sensor?
It is the upstream sensor, mounted in the exhaust ahead of the catalytic converter for the engine's closed-loop fuel control.
Which vehicles does the OS5266 fit?
It is a direct-fit replacement for the 1984-1987 Honda Civic and the 1984 and 1986-1987 Honda Wagovan. See the Buyer's Guide tab to confirm your vehicle.
What are signs this sensor may need replacing?
A rough idle, poor fuel economy, or a check engine light can indicate a failing oxygen sensor, but these signs have other possible causes, so diagnose before replacing.
Will replacing this sensor fix my check engine light?
If a worn upstream oxygen sensor is the cause, this replaces it and returns proper oxygen sensing. If another component is at fault, the light may remain, so confirm the cause first.
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.
