What does an Air/Fuel Ratio sensor do?

An Air/Fuel Ratio (A/F) sensor measures the amount of oxygen in your exhaust gases. This information is sent to your vehicle's computer, which uses it to adjust the fuel injection system and maintain the ideal air-fuel mixture for efficient engine operation and reduced emissions.

How do I know if my A/F sensor needs replacing?

Common signs include a check engine light, decreased fuel economy, rough idling, or poor engine performance. Diagnostic trouble codes (DTCs) related to oxygen sensors are often the clearest indicator.

Does this sensor come with everything needed for installation?

This NGK A/F sensor is designed as a direct replacement part. It typically includes the sensor itself, but always check the product packaging or consult the manufacturer's details to confirm if any specific installation hardware or gaskets are included.

2015-2019 Subaru Legacy Air Fuel Ratio Sensor

Name: NGK 2019-15 Subaru Legacy OE Type 4-Wire A/F Sensor
Brand: NGK
SKU: ngk-ngk-2019-15-subaru-legacy-oe-type-4-wire-a-f-sensor-t14-818503
Price: 122.94 USD
Availability: BackOrder

NGK 2019-15 Subaru Legacy OE Type 4-Wire A/F Sensor

$122.94

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2015-19 Subaru Legacy. NGK OE Type 4-Wire A/F Sensor for accurate air-fuel mixture control.

Key Features

Fits 2015-2019 Subaru Legacy and 2015-2019 Subaru Outback.
Also fits 2011-2012 Toyota Sienna.
OE-type 4-wire design ensures direct replacement compatibility.
Accurately measures oxygen content in exhaust gases for optimal air-fuel ratio.
Helps the engine control module manage fuel injection for efficiency and emissions.

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Product Details

This NGK 4-wire Air/Fuel Ratio (A/F) sensor is built to OE specifications, meaning it's made to perform just like the original part your 2015-2019 Subaru Legacy or Outback came with from the factory. It's a crucial component for your engine's computer to accurately measure the amount of oxygen in your exhaust gases. This data helps the engine control module (ECM) adjust the fuel injection timing and amount, ensuring your engine runs efficiently and produces the correct air-fuel mixture.

A properly functioning A/F sensor is key to maintaining good fuel economy and keeping your emissions in check. If your check engine light is on and the code points to an oxygen sensor issue, replacing it with a well-built OE-type sensor like this NGK unit is a smart move. NGK is a well-known name in ignition and sensor technology, and this part is designed to fit right into your Subaru's exhaust system without modification.

This sensor is also compatible with certain Toyota Sienna models from 2011-2012. Always refer to your vehicle's service manual or consult a professional if you're unsure about installation or diagnosis.