Downstream Oxygen Sensor - Compatible with 2015 - 2020 Subaru WRX STI 2.5L H4 EJ257 FI Turbocharged GAS 2016 2017 2018 2019

Downstream Oxygen Sensor - Compatible with 2015 - 2020 Subaru WRX STI 2.5L H4 EJ257 FI Turbocharged GAS

Position: Downstream

Note: OE Base Sensor; B1S2

Features:
- Coated in with electrodes made of a gas-permeable platinum layer.
- Measures oxygen levels to fine-tune air-fuel mixture, improving fuel economy and saving costs.
- Coating prevents contamination and erosion of the electrode surfaces by combustion residue and particulates in the exhaust gases.
- Determines the oxygen content of the exhaust gas, monitoring the air fuel ratio for combustion efficiency.
- Monitors exhaust gases and reduces pollutants for a cleaner environment.

Compatible With or Fits:
- 2015 - 2020 Subaru WRX STI 2.5L H4 EJ257 FI Turbocharged GAS

Fits Years: 2015 2016 2017 2018 2019 2020