Question 1

What is the torque spec for o2 sensor - downstream on a 2008-2013 BMW M3 E90?

Accepted Answer

The primary torque specification for o2 sensor - downstream on a 2008-2013 BMW M3 E90 is 45 Nm (33 lb-ft). Note: Apply anti-seize

Question 2

How many torque specs are there for BMW M3 E90 o2 sensor - downstream?

Accepted Answer

There are 6 torque specifications for o2 sensor - downstream on the 2008-2013 BMW M3 E90 4.0L V8 S65, covering all related fasteners and components.

Component	Nm	lb-ft	Notes
⚠️ Exhaust Flange Bolts	45	33	Apply anti-seize
⚠️ Flange Bolts	55	40	—
Hanger Bolts	23	17	—
Heat Shield Bolts	10	7	—
Mounting Bolts	31	23	—
⚠️ O2 Sensor	45	33	Apply anti-seize to threads only

O2 Sensor - Downstream Torque Specifications

Torque Values (6 specifications)