Question 1

What is the torque spec for o2 sensor - upstream on a 1990-1991 BMW 325i E30?

Accepted Answer

The primary torque specification for o2 sensor - upstream on a 1990-1991 BMW 325i E30 is 47 Nm (35 lb-ft). Note: Apply anti-seize

Question 2

How many torque specs are there for BMW 325i E30 o2 sensor - upstream?

Accepted Answer

There are 6 torque specifications for o2 sensor - upstream on the 1990-1991 BMW 325i E30 2.5L I6 M20, covering all related fasteners and components.

Component	Nm	lb-ft	Notes
⚠️ Flange Bolts	47	35	Apply anti-seize
Hanger Bolts	20	15	—
Heat Shield Bolts	14	10	—
⚠️ Manifold Nuts	34	25	Apply anti-seize
Mounting Bolts	27	20	—
⚠️ O2 Sensor	47	35	Apply anti-seize to threads

O2 Sensor - Upstream Torque Specifications

Torque Values (6 specifications)