audibmw17

hi all,
I've been trying to replace my crankshaft position sensor on my 4.2 v8 for a while. I can't seem to find it anywhere. I was told it would be right on the bell housing when you take off the drivers side wheel well, theres nothing there. Has anyone done this and knows a step by step?
Thanks!

TeamHate

Unfortunately, I have not done it on the 4.2 motor. I have done it on my A4 1.8t (B6) What a pain on the ***. Not alot of work, only 2 things to remove, but VERY tideous. Due to the location of it, I practically worked blind.

I can't imagine it being harder on the 4.2, seeing as you claim it's located where it is.

IMD

hi there this is by elsa

Camshaft Position Sensors, Checking

This procedure is used to check Camshaft Position (CMP) Sensors -G40 and G163-.
Special tools and workshop equipment required
t Multimeter -V.A.G 1526 A- or equivalent.
t Voltage Tester -VAG1527B- or equivalent.
t Adapter Cable (121-Point) -VAG1598/31-.
t Connector Test Set -VAG1594C-.
Test requirements
l Ignition switched off.

Procedure

– Remove the front engine cover- arrows -1- and -2-.
– Remove the rear engine cover -arrows-.
– Disconnect the relevant Camshaft Position (CMP) Sensor electrical harness connector.

Cylinder bank 1 (right):
– Remove the fuel hose -1-.
– Disconnect the electrical connector -2- from the Mass Air Flow (MAF) Sensor -G70-.
– Remove the Mass Air Flow (MAF) Sensor -G70- from the air duct hose -3-.

– Remove the upper part of the air filter housing with the Mass Air Flow (MAF) Sensor -G70--arrows-.

– Remove the resonator -1- in direction of the-arrow- from the air duct hose.
– Disconnect the brake booster vacuum hose -1- at the bulkhead.

– Loosen the clamp -3- and remove the air duct hose -2-.
– Disconnect the electrical harness connector -arrow- from the Camshaft Position (CMP) Sensor -G40- at rear of the right cylinder head.

Cylinder bank 2 (left):
– Remove the screw -arrow- retaining the coolant reservoir.

– Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch -F66- at the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses -1- and -2- connected.
– Disconnect the electrical harness connector -arrow- from the Camshaft Position (CMP) Sensor 2 -G163- at rear of the left cylinder head.
Checking activation
– Using the Voltage Tester -VAG1527B- or equivalent, and a probe from the Connector Test Set -VAG1594C-. Connect the Camshaft position (CMP) sensor electrical harness connector terminals 1 and 2 together and check for voltage leaving the Camshaft position (CMP) sensor electrical harness connector connected to the Camshaft position (CMP) sensor.
– Operate the starter for a few seconds.
The LED must blink.
NoteVoltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and then get significantly brighter during activation.
– Switch ignition off.
If the LED blinks:
– Replace the faulty Camshaft Position (CMP) Sensor.
If the LED does not blink:
Checking voltage supply

– Using the Multimeter -V.A.G 1526 A- or equivalent, check the following wiring connection for voltage:

Harness connector
Terminal Measure to
1 Engine Ground (GND)

– Switch the ignition on.
Specified value: about 5 V.
– Switch the ignition off.
Checking signal wire

– Using the Multimeter -V.A.G 1526 A- or equivalent, check the following wiring connection for voltage:

Harness connector
Terminal Measure to
2 Engine Ground (GND)

– Switch the ignition on.
Specified value: approx. battery voltage.
– Switch the ignition off.
Checking Ground (GND)

– Using the Multimeter -V.A.G 1526 A- or equivalent, check the following wiring connection for voltage:

Harness connector
Terminal Measure to
3 Battery positive (+)

Specified value: about 10 V.
If the specification is not obtained:
– Check the wiring for a short circuit to Battery positive (+) or an open circuit.
– If necessary, repair the wiring connection.
If no malfunction can be found:
Checking wire connections between Camshaft Position (CMP) sensor and Engine Control Module (ECM)
– Connect the Adapter Cable (121-Point) -VAG1598/31- to the wiring harness of the Engine Control Module (ECM) -J623- ; the ECM is not connected. → Chapter.

– Using the Adapter Cable (121-Point) -VAG1598/31- and Multimeter -V.A.G 1526 A- or equivalent, check the following wiring connections for an open circuit.
l Camshaft Position (CMP) Sensor -G40- (bank 1).

Harness connector
Terminal Test box
Socket
1 Battery positive (+) 98
2 (signal) 87
3 Ground (GND) 108

l Camshaft Position (CMP) Sensor 2 -G163- (bank 2).

Harness connector
Terminal Test box
Socket
1 Battery positive (+) 98
2 (signal) 86
3 Ground (GND) 108

Specified value: Wire resistance max 1.5 Ω.
If the specification is not obtained:
– Check the wiring for a short circuit to Battery positive (+) or an open circuit.
– If necessary, repair the wiring connection.
If no malfunction can be found:
– Replace the Engine Control Module (ECM) -J623-. → Chapter.
Assembly is performed in the reverse order of removal, note the following:
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1 - Check the DTC memory. → Chapter.
2 - If necessary, erase the DTC memory. → Chapter.
3 - If the DTC memory was erased, generate readiness code. → Chapter.
– End diagnosis and switch ignition off.

IMD

here are few

IMD

good luck