Oxygen Sensor for Subaru Legacy Outback 4-Wire Heated 22641-AA540 Air-Fuel Ratio
Upgrade your Subaru Legacy Outback with the WEIDA AUTO PARTS 4-Wire Heated Oxygen Sensor, part number 22641-AA540. This replacement sensor delivers accurate air-fuel ratio readings to help your engine run efficiently, reduce emissions, and maintain optimal performance. The 4-wire heated design ensures fast sensor warm-up, so the engine reaches its ideal operating temperature quickly, even on cold mornings. With a piezoelectric sensing element and compatibility with Subaru Legacy Outback models, this sensor provides reliable, consistent readings when you need it most.
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Benefits & Tips
- Restores precise air-fuel ratio readings to improve fuel efficiency, smoother idle, and lower emissions.
- Heated, 4-wire design enables rapid sensor warm-up for faster catalytic converter light-off and cleaner startup.
- Direct OEM replacement for Subaru Legacy Outback, ensuring proper fit and reliable performance.
Product specifications
- Brand: WEIDA AUTO PARTS
- Model / OEM No.: 22641-AA540
- Part compatibility: Designed for Subaru Legacy Outback
- Sensor Type: Piezoelectric
- Type: Heating (heated O2 sensor)
- Wiring: 4-wire
- Measuring Range: for Subaru LEGACY OUTBACK
- Hysteresis: 22641AA540 / 22641AA54A
- Repeatability: 22641AA540 / 22641AA54A
- Resolution: Oxygen Sensor
- Origin: Mainland China
Package includes:
- 1 x 4-wire heated oxygen sensor (O2 sensor) 22641-AA540 for Subaru Legacy Outback
Warnings / Reminders
- Ensure the engine is cool before handling the sensor and disconnect the battery if performing a replacement.
- Handle the sensor tip carefully to avoid damage to the sensing element and wiring.
- Confirm vehicle compatibility with the OEM part number 22641-AA540 before installation.