Ford Focus upstream pre-cat oxygen sensor 8F9A-9Y460 replacement 8F9Z9F472H OEM standard output

When your Ford Focus displays check engine light, noticeably higher fuel consumption, rough idle, or weak acceleration, upstream O2 sensor aging is common. The sensor provides real-time feed of the air–fuel ratio to the ECU for precise fuel injection and complete combustion, boosting power and lowering emissions. This is an OEM standard output replacement, OEM number 8F9A-9Y460, compatible with 8F9Z9F472H, 8F9Z9F472J, 0258017322, and many Ford Focus 1.6L/1.8L/2.0L engines. Installation should be done with the engine cold to avoid burns; clean the threads and mounting seat to prevent debris from entering the exhaust.