Porsche Enthusiasts Club Forum

Hi All

Has anyone got a working Hall Sender for a 968, my car seems fine but the Durametric shows an error for the hall sender.

I have replaced the plug and socket on the cable and the car seems to drive fine.

its a pain to change but I guess I have to go for it.

Often the DME reporting a bad hall sensor, although the hall sensor itself tests as fine, is caused by bad ignition components, such as the plug leads, distributor cap or rotor arm.

The reason for this is that the wiring or the sensor itself, pick up the background interference and it muddies the signal seen by the DME from the sensor.

Another cause can be a bad engine earth, which may be sufficient for the starter to crank due to the large amount of amps involved but the resistance being too high for a good ground bias for the engine and its sensors.

This way well explain why your DME is reporting a faulty hall sensor but the sensor seems fine.

These problems are also found in the 964 and 993, where the hall sensor is within the distributor body, but again the DME see's the interference caused by plug leads etc to being a bad hall sensor, which being a similar version of Motronic software and hardware, it not surprising.

thanks for the reply Jon

it is also throwing up 1-1-4-1 faulty control unit.

the cap and rotor have been replaced and the leads look to be fairly new, I replaced the plug and socket on the hall sensor because the HVAC valve had worn right into the Hall Sensor wire and there were bare wires visible.

the car has always had bad hesitation since I got it back in November 2013 and repairing that plug and wires seems to have solved that problem.

do you think that placing a shield cover over the hall wiring would help this.

the shield from the Hall sensor seems to connect to just a plain 0.5 wire in the loom, and of course you know where is goes from there around the engine.

I do not have any hesitation now and it rev's cleanly all the way to the red line.

I was only going to try swapping the Hall Sensor with a known good one as they are quite expensive and before rushing in and just replacing parts I like to know for sure they are duff.

thanks for the advice and I will clean the grounds in the engine bay.

I have wired up the engine check light so if the fault clears I should be able to tell.

Thanks Again

I have solved this issue nice and cheap

Bought a Hall sensor for any number of Audi VW Skoda cars came on a huge bracket, removed mine out of the car and tested it with a DVM and it was open circuit,

drilled out the rivets on the old one and did the same to the new one, then fitted the new sensor to the old mounting bracket with pop rivets.

chopped the plug off and fitted a new plug bought of the internet, replaced the sensor back in the car and the flashing LED in the Diag plug now shows the fault as cleared.

Porsche Price for the Hall sender £184.00

My fix was £4.99 for the plug and £7.99 for the Hall sender.

The car now drives as it should.

this should also work for 928's and 944's that have the same sensor

Thanks good tip there !

Hi there Waylander +1 on a good tip .

However, would you be able to give us the details (part number and ebay ref) for the two parts you used? Save having to do a search, especially as you have had a successful repair. Thanks...

Good one nice
I like simple solutions that cost less .

you need one of these

http://www.ebay.co.uk/itm/111137153383? ... 1439.l2649

And one of these.

http://www.ebay.co.uk/itm/290793914201? ... 1439.l2649

and if your cam cover has not been off for a while a cam cover gasket (928 104 447 09), the Variocam Gasket and O ring (944 104 463 02) (999 701 693 40) , and 4 plug gaskets (928 104 443 08) as well.

I saved £160 on the OPC price

Thanks for the info - will probably get those in the next few days as the plug on my sender has broken up a bit and being held together with tape!

hi there, my 968 recently suffered from misfire and hesitation on acceleration, the engine check light didn’t show any errors as someone in the past removed the bulb from dash…
Oscilloscope connected to signal wire pin 2 on cam sensor shows no pulse signal, only 4.8 v voltage.
After fitting cam position sensor from A3 96 the engine come back to life, feels much smoother and no hesitation.
The dis/assembly is little fiddly as the cam cover must be lifted for access to the screw on top of hall sensor.
Another alternative is to remove the cam top housing and slide out the magnesium cover for better access to the top bolt, this was the way I have followed but one needs to be careful not to drop anything into the cam cogworks (968 cam wheel comes with holes giving access to the magnesium 3x cam cover, all 3 need to be slack to enable approx 5 mm movement of the cam cover).
The sensor swap from vw bracket to Porsche bracket requires removal of the 2 rivets and fitting sensor with new rivets onto the metal plate. The wires come with different colours and the pin allocation on 3 pin socket is different therefore schematic of pins is necessary to ensure earth, 5v feed and signal are correctly wired to new EV1 socket,

Thanks again for the guide, pls see attached pic for the ok signal checked with scope