Question 1

What is the torque spec for o2 sensor - downstream on a 2009-2012 Audi A4?

Accepted Answer

The primary torque specification for o2 sensor - downstream on a 2009-2012 Audi A4 is 47 Nm (35 lb-ft). Note: Apply anti-seize

Question 2

How many torque specs are there for Audi A4 o2 sensor - downstream?

Accepted Answer

There are 6 torque specifications for o2 sensor - downstream on the 2009-2012 Audi A4 3.2L V6, 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 - Downstream Torque Specifications

Torque Values (6 specifications)