1990-2004 GMC Sonoma O2 Sensor - Upstream Torque Specs

4.3L V6 Vortec

Applies to 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, and 2004 GMC Sonoma

Labor Time:0.5 hours

🔧 Torque Values6 specifications

Component	lb-ft	Nm	Notes
⚠️ Flange Bolts	40	54	Apply anti-seize
Hanger Bolts	17	23	—
Heat Shield Bolts	12	16	—
⚠️ Manifold Nuts	29	39	Apply anti-seize
Mounting Bolts	20	27	—
⚠️ O2 Sensor	40	54	Apply anti-seize to threads

⚠️ = 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 1990-2004 GMC Sonoma is 54 Nm (40 lb-ft). Note: Apply anti-seize

There are 6 torque specifications for o2 sensor - upstream on the 1990-2004 GMC Sonoma 4.3L V6 Vortec, covering all related fasteners and components.