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Speedo dropping to 0
Posted: Sun Jan 12, 2014 11:27 am
by Waxman
Got a niggly on the RS.
Every now and then the speedo drops to 0 when driving - appears a common 406 fault by all accounts.
Couple of fixes I've seen are the transponder(?) behind the glovebox or a dirty speed sensor on the gearbox.
Not sure if mine is fitted with the glovebox sensor - ( 2000 GTX 110hdi )
Before I start undoing things, anyone had this on theirs for a quicker fix ?
Thx
Jay
Re: Speedo dropping to 0
Posted: Sun Jan 12, 2014 12:07 pm
by steve_earwig
You won't have a transducer above the glovebox. Do you notice a drop off in performance when it does this? If so it's the transducer on the gearbox, if not it's probably a dodgy joint on the dash I'm afraid.
Re: Speedo dropping to 0
Posted: Sun Jan 12, 2014 12:32 pm
by Doggy
On later, full-mux cars you can test the clocks while stationary with PP2k, which should tell if it's a dash issue, (you probably can with semi-mux too, just haven't tried).
Re: Speedo dropping to 0
Posted: Sun Jan 12, 2014 12:51 pm
by scotty73
I had this happen this time last year.. Quite fun when the power drops off while towing 1100kgs up up a mountain.
Had my mechanic change the gearbox speed sensor and jobs a good un... The needle does seem to judder a bit around the 60 to 70mph mark though... Think i paid about £14 from Ebay but can't find the listing now.
Re: Speedo dropping to 0
Posted: Sun Jan 12, 2014 7:48 pm
by Waxman
steve_earwig wrote:You won't have a transducer above the glovebox. Do you notice a drop off in performance when it does this? If so it's the transducer on the gearbox, if not it's probably a dodgy joint on the dash I'm afraid.
thx
Yes, you notice a slight dip on road speed and power output - a little surge when it comes back too.
Thx all, I'll get the mechs on it
Jay