2015-2024 Subaru Legacy O2 Sensor - Upstream Torque Specs

2.5L H4

Applies to 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, and 2024 Subaru Legacy

Labor Time:0.5 hours

🔧 Torque Values6 specifications

Component	lb-ft	Nm	Notes
⚠️ Exhaust Flange Bolts	33	45	Apply anti-seize
⚠️ Flange Bolts	35	47	—
Hanger Bolts	15	20	—
Heat Shield Bolts	7	10	—
Mounting Bolts	20	27	—
⚠️ O2 Sensor	33	45	Apply anti-seize to threads only

⚠️ = Critical torque value | Always verify with vehicle-specific service manual

⚠️ Some critical specs are estimated. Please verify sequence.

1990-1997 4.6L V8 Modular

2007-2012 3.7L I5

2011-2016 6.7L V8 Power Stroke Diesel

1992-1995 1.5L I4 D15

2016-2023 2.0L Turbo I4

1995-1999 2.0L Turbo I4

The primary torque specification for o2 sensor - upstream on a 2015-2024 Subaru Legacy is 45 Nm (33 lb-ft). Note: Apply anti-seize

There are 6 torque specifications for o2 sensor - upstream on the 2015-2024 Subaru Legacy 2.5L H4, covering all related fasteners and components.