Audi TT (2007 year). Manual - part 57

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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.

– Unplug electrical connector -2- on exhaust gas pressure sen‐

sor 1 -G450- .

– Remove bolt -1- and nuts -arrows- and push exhaust gas

pressure sensor 1 -G450- to side.

– Unscrew exhaust gas temperature sender 4 -G648- -item 1-

from exhaust pipe behind particulate filter.

Note

Disregard -item 2-.

– Remove nuts -1- and -2- and detach bottom bracket for par‐

ticulate filter.

1. Silencers

219

– Remove bolts and nuts -arrows-.
– Detach heat shield to rear.

– Using engine support -3300 A- , push engine/gearbox assem‐

bly forwards by distance -a-.

• Distance -a- = 35 mm.

– Remove particulate filter by rotating through 180° and about

its own axis -arrow-.

Installing
• Tightening torque

⇒ page 216

Installation is carried out in the reverse order; note the following:

Note

♦

Renew gaskets, self-locking nuts and clamp for particulate fil‐

ter.

♦

Fit all cable ties in the original positions when installing.

⇒ page 221

– Install exhaust gas temperature sender 4 -G648-

⇒ page 225

– Install Lambda probe -G39- and exhaust gas pressure sensor

– After renewing particulate filter, perform “Adaption” in “Guided

Functions” ⇒ Vehicle diagnosis, testing and information sys‐

tem VAS 5051.

220

1.3

Stress-free alignment of exhaust system

Procedure
• The exhaust system must be aligned when it is cool.
• Tightening torque

⇒ page 216

– Loosen bolt connections on front clamp.
– Push exhaust system towards front of vehicle until preloading

at mounting for rear silencer -a- = 11 ... 13 mm.

– Fit the clamp at the angle shown.
• Angle -α- = approx. 20°
• Bolt connections facing towards right
• Nuts facing upwards
– Tighten bolt connections on clamp evenly.

1.4

Aligning tailpipes

Procedure
– Align rear silencer so that there is an equal distance -a- and

-b- between bumper cut-out and tailpipes.

– Unfasten rear silencer mounting to align tailpipes.

1.5

Checking exhaust system for leaks

– Start the engine and run at idling speed.
– Plug tailpipes during leak test (e.g. with cloth or plug).
– Listen for noise at the connection points of cylinder head/ex‐

haust manifold, turbocharger/front exhaust pipe etc. to locate

any leaks.

– Rectify any leaks that are found.

1. Silencers

221

Exhaust gas temperature control

2.1

Exhaust gas temperature control - exploded view

1 - Turbocharger
2 - Control pipe

❑ 45 Nm

3 - Particulate filter
4 - Nut

❑ 9 Nm

5 - Bracket

❑ Bolted to particulate fil‐

ter

6 - Hose
7 - Bracket

❑ For exhaust gas pres‐

sure sensor 1 -G450-

8 - Exhaust gas pressure sen‐

sor 1 -G450-

❑ Removing and installing

9 - Bolt

❑ 8 Nm

10 - Nut

❑ 9 Nm

11 - Exhaust gas temperature

sender 3 -G495-

❑ Removing and installing

⇒ page 224

❑ Coat with high-tempera‐

ture paste; for high-tem‐

perature paste refer to

⇒ Electronic parts cata‐

logue

❑ 4.5 Nm

12 - Lambda probe -G39- with Lambda probe heater -Z19-

13 - Exhaust gas temperature sender 4 -G648-

❑ Removing and installing

⇒ page 225

❑ Coat with high-temperature paste; for high-temperature paste refer to ⇒ Electronic parts catalogue
❑ 45 Nm

14 - Exhaust gas temperature sender 1 -G235-

❑ Removing and installing

⇒ page 223

❑ Coat with high-temperature paste; for high-temperature paste refer to ⇒ Electronic parts catalogue
❑ 45 Nm

222

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