Oxygen Sensor for Subaru Impreza and Forester 1999-2006 Rear 4-Wire Replacement Part

Subaru Impreza/Forester Rear 4-Wire O2 Oxygen Sensor from WEIDA Auto Parts is a reliable replacement designed to restore accurate exhaust gas monitoring for your 1999-2006 Subaru Impreza (1.6L) and Forester (2.0L, 2.2L, 2.5L). This rear sensor uses a 4-wire configuration and a magnetic induction sensing element to deliver consistent, durable readings that help your engine run smoothly, optimize fuel efficiency, and keep your emissions in check. Built to match the OEM footprint and electrical interface, it installs with ease and fits the original mounting location, so you can trust it to perform like the factory part. This sensor helps your vehicle maintain optimal air-fuel balance by providing precise oxygen readings to the engine computer. By replacing a degraded rear O2 sensor, you may notice improved idle stability, steadier MPG, and a reduction in catalytic converter stress due to erratic fuel mixtures. The 4-wire heating design supports faster sensor warming, which means more accurate readings sooner after startup and better cold-start performance—especially important in cold climates or stop-and-go driving. Benefits & Tips - Reliable replacement for worn rear O2 sensors on Subaru Impreza and Forester models from 1999–2006, restoring proper emissions monitoring. - Faster warm-up thanks to its heating capability helps reduce rich fuel mixture during cold starts, improving fuel economy and reducing exhaust emissions. - Easy installation in the rear sensor position; ensure proper alignment with the OEM footprint and connector orientation for a secure, leak-free fit. Product specifications - Brand: WEIDA AUTO PARTS - Vehicle compatibility: Subaru Impreza 1.6L; Forester 2.0L, 2.2L, 2.5L - Years: 1999–2006 - Sensor type: Magnetic Induction - Wiring: 4-Wire - Heating: Yes (heating type) - OEM No.: 22690-AA420 - Alternate OEM numbers: 22690AA420, 22690AA540, 22690AA640 - Hysteresis: 22690AA420 / 22690AA540 / 22690AA640 - Resolution: 22690-AA420 / 22690-AA540 / 22690AA640 - Repeatability: 234-4706 - Origin: Mainland China Package includes: - 1 x WEIDA Auto Parts Rear 4-Wire Oxygen Sensor for Subaru Impreza/Forester (1999-2006) Warnings / reminders - Disconnect the vehicle battery and allow the exhaust system to cool before installation. - Verify fitment for your exact year and model; ensure connector and sensor orientation match the original part. - If you are not comfortable with automotive electrical work, consult a professional technician for installation. All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty. Language support - Not specified for this product. If language support is available, it will be listed in the product details. Trust statement Providing quality and trusted service since 2002 at intercyprus.com.