Volkswagen Phaeton 2003, Workshop Manual

Page: 181 / 190

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– Separate wiring connections to Lambda probes -arrows- and
unclip wires from cable guides.
– Unscrew Lambda probes before catalytic converter using
Lambda probe open ring spanner set - 3337- .
– Raise vehicle and remove front right wheel housing liner.
– Unscrew heat shield above right drive shaft -arrows- to gain
access to threaded connections of catalytic converter / ex‐
haust pipe.
– Now unscrew securing bolt ⇒ Item 1 (page 172) so that ex‐
haust pipes can be removed individually.
– Now remove catalytic converter for cylinders 1, 2 and 3 from
exhaust manifold.
– Unscrew Lambda probe after catalytic converter using Lamb‐
da probe open ring spanner set - 3337- .
– Remove catalytic converter for cylinders 4, 5 and 6 and Lamb‐
da probe after catalytic converter in the same way.
– Now remove exhaust manifold.
Installing
The assembly is basically a reverse of the dismantling sequence.
– First install the catalytic converter for cylinders 4, 5 and 6 to
exhaust manifold with Lambda probe after catalytic converter
screwed in.
– Then install the catalytic converter for cylinders 1, 2 and 3 with
Lambda probe after catalytic converter screwed in.
– Now tighten bracket for front exhaust pipes
⇒ Item 2 (page 172) to gearbox and fit exhaust pipes to brack‐
et.
Note
♦ When installing exhaust pipes, ensure that the flange connec‐
tion after the catalytic converter seals tightly. Leaks in this area
cause pulsation in exhaust. This allows ambient air to reach
the Lambda probe after the catalytic converter, thereby dis‐
turbing Lambda regulation.
♦
Adjust exhaust system so that there is sufficient clearance to
gearbox and subframe.
Further assembly is basically the reverse of the dismantling se‐
quence.
Phaeton 2003 ➤
6-cylinder injection engine - Edition 02.2014
1. Parts of exhaust system
175