I posted a topic about an erratic speedometer the other day. Having pulled out the G22 speed sensor on the diff and then put it back in again, the speedometer originally went crazy before dying as it had before. The following day however, the speedo began to function normally and has done ever since (approx 500 miles).
One theory for the above is that the speedo was recalibrating itself (is this possible?) after the resumption of a proper signal, and that the problem was therefore caused by a bad contact on the connector down near the LH front drive flange.
If this is the case, I want to treat the connector to prevent this happening again. Is there a product/s which will optimise the contact between the pins, as well as providing some degree of protection and waterproofing? I'm sure I've read a post on this topic on this forum, but forgot to save it and no amount of searching will bring it up on the screen again.
So far, none of my repairs has worked. I've replaced the G22 Speedometer sensor (VSS). I've replaced the connector on the VSS and the wiring leading to it.
Today I checked the signal from the VSS on VAG-COM - no signal. I would have expected a speed reading on VAG-COM if the speedo/instrument cluster was causing the problem, but clearly that is not where the fault lies. However, there is still a faint possibility of a bad contact at the connector on the back of the cluster.
The most likely cause now seems to be a faulty ground somewhere or an intermittent break in the wiring. Each time I disturb the connector on the VSS or pull out the sensor itself, the speedo lurches briefly into life before once more resuming its position on the needle stop.