Oil temp gauge issue's

[boomd]

I've just changed the Oil level/temp sensor in the sump to try and get the gauge working again, it does not go up while driving along but if I turn the ignition back on after i've parked up it does this:



As you can see it reads a temp but as soon as the car is started it drops. does anyone have any idea's why it works then doesn't?

[Alan02]

Maybe a Cluster fault. Can you check the connections at sensor with ignition ON and then again once running? You may find an issue with feeds or earths?

[boomd]

Thanks for that Alan think you might be right with an earth, might try re grounding the oil temp sender and see what happens

[Alan02]

Hi, if this helps: Oil temp BL/W @sensor to 4a/1 on cluster.
Oil pressure W/B @sensor to 26a/18 on cluster.
Earth looks to be thru body of sensor.

BL/W = blue wire, white tracer.
W/B = white wire, black tracer.

[boomd]

Thanks for the info Alan

I thought the sensor was a integrated level/temp sensor with 3 pins not oil pressure thought that was driven off a sensor in the oil cooler?, I found this info on another Audi site while looking last night (won't put link as don't know if its against rules!)

Pin1 - 12V Switching
Pin2 - Ground
Pin3 - Signal Continuity to ecu\cluster

But going back to that site to get the info I followed link in the thread and it seems lots of people having this problem even after replacing still it if they never bought a hella branded one they seem to be the only ones that work correctly ( and I don't have a hella branded one )!