TRQ OSA61841 Upstream A/F + Downstream O2 Set for 14-18 Forester XT 15-20 WRX

DESCRIPTION
TRQ O2 Oxygen Sensor Set (2-Piece)
Manufacturer Part Number: OSA61841
UPC: 195591618410

WHAT YOU GET
- (1) Upstream Air/Fuel Ratio Sensor (front, before catalytic converter)
- (1) Downstream Oxygen Sensor (rear, after catalytic converter)

FITMENT (VERIFY ENGINE)
- 2014-2018 Subaru Forester 2.0XT (2.0L H4 Turbo)
- 2015-2020 Subaru WRX 2.0L H4 Turbo
Note: Forester must be the 2.0XT 2.0L turbo model, not the 2.5L.

SENSOR DETAILS (TYPICAL FOR THIS APPLICATION)
Upstream (A/F Wideband Sensor reference: Denso 234-5178)
- Wire count: 5 (wideband A/F sensor)
- Harness length: 11.1 in

Downstream (O2 Sensor reference: Denso 234-4988)
- Wire count: 4 (heated)
- Harness length: 9.53 in
- Thread diameter: 0.708 in

REFERENCE AND INTERCHANGE NUMBERS
- Interchange: 250-241160, 250-25125, 234-4988, 234-5178
- OE/OEM references commonly shown on listings: 234-5178, 250-241160, 234-4988, 250-25125

WHY BUY
- Direct-fit replacements designed to help restore fuel economy, drivability, and emissions performance.
- Helps address common O2 and A/F sensor related check engine lights and fuel trim issues.

INSTALL NOTES
- Match the connector and wire count to your original sensors before purchase.
- Use an O2 sensor socket. Apply anti-seize only if threads are not pre-coated (keep it off the sensor tip).
- Clear codes after installation and verify with a scan tool.