Question 1

What is the torque spec for o2 sensor - downstream on a 1994-1997 BMW 840Ci E31?

Accepted Answer

The primary torque specification for o2 sensor - downstream on a 1994-1997 BMW 840Ci E31 is 54 Nm (40 lb-ft). Note: Apply anti-seize

Question 2

How many torque specs are there for BMW 840Ci E31 o2 sensor - downstream?

Accepted Answer

There are 6 torque specifications for o2 sensor - downstream on the 1994-1997 BMW 840Ci E31 4.0L V8, covering all related fasteners and components.

Component	Nm	lb-ft	Notes
⚠️ Flange Bolts	54	40	Apply anti-seize
Hanger Bolts	23	17	—
Heat Shield Bolts	16	12	—
⚠️ Manifold Nuts	39	29	Apply anti-seize
Mounting Bolts	31	23	—
⚠️ O2 Sensor	54	40	Apply anti-seize to threads

1994-1997 BMW 840Ci E31 O2 Sensor - Downstream Torque Specs

Torque Values (6 specifications)