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– Remove coolant expansion tank -arrow-.
– Disconnect electrical connection from Engine Coolant Level
(ECL) warning switch -F66- at bottom of coolant reservoir and
set aside coolant reservoir with coolant hoses -1- and -2- con‐
nected.
– Disconnect electrical harness connector -2- for Oxygen Sen‐
sor (O2S) 2 behind Three Way Catalytic Converter (TWC) -
G131- and free up wire.
Note
Ignore -1 -.
– Remove oxygen sensor -2- using ring spanner set -3337- .
Note
To improve clarity, the removed engine is shown.
Installing
Installation is in reverse order of removal, note the following:
Note
♦
Replace O-ring.
♦
New oxygen sensors are coated with assembly paste; the
paste must not get into slots of oxygen sensor body.
♦
When reinstalling the previously used oxygen sensor, coat
thread with hot bolt paste ⇒ Parts Catalog . Paste must not
get on to slits of sensor body.
♦
Electrical wire of oxygen sensor must always be secured in
the same position when installing so that contact with the ex‐
haust pipe is avoided.
Tightening Specifications
Component Nm
Oxygen sensor in front exhaust pipe 55
Audi A6 2005 ➤
Fuel Injection and Ignition - Edition 03.2008
50 Rep. Gr.24 - Fuel injection system
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