Overview - Exhaust Gas RECIRCULATION

WARNING: This page is about a different car, the 2015 Audi Q7, 2014 Audi Q7, and 2013 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Overview Of Exhaust Gas Recirculation

Courtesy of AUDI OF AMERICA, LLC

Exhaust Gas Recirculation (EGR) Pipe
- To the Intake Manifold
- Tightening specification and sequence. Refer to Fig 2.
Bolt
- Tightening specification and sequence. Refer to Fig 2.
Seal
- Replace
EGR Temperature Sensor -G98-
- 35 Nm aluminum exhaust gas recirculation radiator
- 45 Nm steel exhaust gas recirculation radiator
- Removing and installing. Refer to EGR Temperature Sensor -G98-, REMOVING AND INSTALLING .
Bolt
- 9 Nm
EGR Cooler
- Removing and installing. Refer to EXHAUST GAS RECIRCULATION (EGR) COOLER, REMOVING AND INSTALLING .
Seal
- Replace
Bleeder Screw
- 8 Nm
Seal
- Replace
Connection
O-Rings
- Replace
Seal
- Replace
EGR Motor -V338-
- Note the installation position
- With EGR Potentiometer -G212-
- Removing and installing. Refer to EGR Motor -V338-, REMOVING AND INSTALLING .
Bolt
- 9 Nm
Bolt
- 9 Nm
Engine Temperature Control Sensor -G694-
- Removing and installing. Refer to Engine Coolant Temperature Sensor -G62-, REMOVING AND INSTALLING .
Seal
- Replace
Bolt
- Replace
- Tightening specification and sequence. Refer to Fig 3.
EGR Pipe
- From the turbocharger
- If the screw-type clamps -Item 21- OVERVIEW - EXHAUST GAS RECIRCULATION were loosened, then the EGR pipe and the screw-type clamp must always be replaced
- Tightening specification and sequence. Refer to Fig 3.
Seal
- Replace
Screw-Type Clamp
- Tightening specification:
  - Part number 059 131 548 C: 5 Nm
  - Part number 059 131 548 D: 3.5 Nm
  - Replace
Bolt
- 9 Nm
O-ring
- Replace
Coolant Connection
Bolt
- Tightening specification -Item 7- OVERVIEW - COOLANT SHUT-OFF VALVE .
Screw-Type Clamp
- Replace
- Tightening specification and sequence. Refer to Fig 2.
Seal
- Replace

Fig 2: EGR Pipe At Intake Manifold - Tightening Specification and Sequence

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Replace the seals

The flange at the EGR pipe must not be wavy or bent.

-- Attach the EGR pipe with the seals and the screw-type clamps.

NOTE:

Coat the thread on the bolts with hot bolt paste.

-- Tighten the bolts/screw-type clamps in three steps in the sequence shown:

Step	Bolts/Screw-Type Clamps	Tightening Specification
1.	-1 and 2-	Turn them by hand until the bolt heads are touching
2.	-3-	Position them as shown in the illustration 2.5 Nm
3.	-1 and 2-	9 Nm

Fig 3: EGR Pipe At Turbocharger - Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Replace the EGR pipe and the screw-type clamp if the screw-type clamp was loosened.

Replace the bolts that were tightened with an additional turn.

-- Attach the EGR pipe with the seals and the screw-type clamps.

NOTE:

Coat the thread on the bolts with hot bolt paste.

-- Tighten the bolts/screw-type clamps in three steps in the sequence shown:

Step	Bolts/Screw-Type Clamps	Tightening Specification/Residual Torque
1.	-2 and 3-	Turn them by hand until the bolt heads are touching
2.	-1-	Position using the tab on the EGR pipe tightening specification -Item 21- OVERVIEW - EXHAUST GAS RECIRCULATION => List Item:Screw-Type Clamp
3.	-2 and 3-	5 Nm
4.	-2 and 3-	Turn an additional 90°.