Speedo dropping to 0

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Waxman
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Speedo dropping to 0

Post 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
:wink:
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steve_earwig
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Re: Speedo dropping to 0

Post 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.
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Doggy
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Re: Speedo dropping to 0

Post 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).
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scotty73
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Re: Speedo dropping to 0

Post 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.
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Waxman
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Re: Speedo dropping to 0

Post 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 :wink:

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

:wink:

Jay
The Rubble Shifter: 2.0 HDi 110 GTX 406 Estate, Tuning Box, K&N Filters.
Thunderbird 4: Mercedes AMG E55, Full Decat & Res Delete.
*New Addition* The Roller Skate: VW Polo GTi
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