Removing and installing oil pressure and oil temperature sender G437 or oil pressure and oil temperature sender 2 G640, 0BE, 0BF — AUDI

Removing and installing
oil pressure and oil temperature sender
G437
or
oil pressure and oil temperature sender 2
G640
, 0BE, 0BF
Special tools and workshop equipment required
Socket (27 mm)
T40218
Vehicle diagnostic tester
Important safety precautions:
After renewing the
oil pressure and oil temperature sender
G437
or the
oil pressure and oil temperature sender 2
G640
, the identity of the corresponding sender must be re-adapted in the
all-wheel drive control unit
J492
Vehicle diagnostic tester
.
Do not renew both
oil pressure and oil temperature senders
(
G437
and
G640
) at the same time, as at least one valid sender identity is required at any time for the allocation of the rear final drive to the
all-wheel drive control unit
J492
. If both senders are renewed at the same time, the
all-wheel drive control unit
J492
would interpret this as the replacement of the rear final drive. This would erase all the learnt values in the control unit and impair the performance of the rear final drive.
If both
oil pressure and oil temperature senders
(
G437
and
G640
) have to be renewed due to mechanical damage, e.g. damage to the connector housing, this should be done in two steps: After the first sender has been renewed, the identity of the sender must be re-adapted in the
all-wheel drive control unit
J492
Vehicle diagnostic tester
. Proceed in the same manner for the second sender.
If both
oil pressure and oil temperature senders
(
G437
and
G640
have to be renewed due to an electrical fault, the clutch classification must be entered again in the
all-wheel drive control unit
J492
Vehicle diagnostic tester
. In addition, the ATF in the rear final drive must be renewed
Chapter
.
Note
Refer to general repair instructions
Chapter
.
Observe safety precautions
Chapter
.
Removing
Ignition is switched off.
Place vehicle on lifting platform.
Lower rear section of exhaust system slightly and secure.
If necessary, remove bracket for wiring harness from rear final drive
Anchor
.
Unplug connector
1
from
oil pressure and oil temperature sender 2
G640
/ connector
2
from
oil pressure and oil temperature sender
G437
.
Note
If necessary, unplug connectors
3
and
4
.
Position
drip tray
under rear final drive.
Remove corresponding
sender
using
socket
T40218
.
A
=
oil pressure and oil temperature sender 2
G640
- black connection
B
=
oil pressure and oil temperature sender
G437
- brown connection
Installing
Carefully screw in new
sender
with new O-ring
arrow
at its fitting location and tighten to specified torque
Item
or
Item
.
A
=
oil pressure and oil temperature sender 2
G640
- black connection
B
=
oil pressure and oil temperature sender
G437
- brown connection
Plug in connector
1
at
oil pressure and oil temperature sender 2
G640
/ connector
2
at
oil pressure and oil temperature sender
G437
.
Note
If unplugged earlier, plug in connectors
3
and
4
.
If removed earlier, install bracket for wiring harness at rear final drive
Anchor
.
Connect vehicle diagnostic tester and switch on ignition.
Using vehicle diagnostic tester in
Guided Functions
mode, select
22 - Four-wheel electronics
and then select the function
22 - Adapt sender
.
It is important to follow all instructions given by the vehicle diagnostic tester exactly.
Using the vehicle diagnostic tester, the new sender is
“adapted”
to the
all-wheel drive control unit
J492
.
Note
When
22 - Adapt sender
function has been completed, a system check is performed. Any malfunctions during this test must be eliminated via the
“Guided Fault Finding”
.
Top up ATF in rear final drive
Chapter
.
Attach rear section of exhaust system to body and perform stress-free alignment
Rep. gr.
26
Exhaust pipes/silencers; Exploded view - silencers
.