Speedo and Fuel Gauge

[modified_nutter]

Hi All
Just after some advice as the Speedo and Fuel Gauges on my MK3 Ibiza Cupra have both packed up. My speedo will work for the first 30 seconds after turning the car on then it just lays at 0. The fuel gauge bounces from right to left depending whether its a right or left hand bend!
Ive tried disconnecting the battery and this made no difference. Ive searched the forum but couldnt find anything that directly related to whats happening to my cupra. I presume this is an electrical problem but other than that I have no ideas.
Please help! Thanks

 

[Sharky_82]

Fuse - although not sure which one so probably wasnt much point in this post - lol

i remember pulling a fuse out and my speedo needle dropped to zero a while back

 

[KingStreet]

Speedo & Mileage Problem

What's happening? I have the same problem with my Leon 1.4. (As well as Madmarcus, karls cupra, modified_nutter and VegasKid) I can't understand how the two problems are linked unless it is a wiring fault. (OMG!) I have tried another speed sender in the gearbox and have pulled out the instument cluster to try a 1.6 unit. Neither cleared the fault and the 1.6 unit added 100,000 miles to the odometer. Even worse; now that I have replaced the original instrument cluster the airbag warning light is on all the time.
I have asked around and not been able to find a compatible instument cluster from breakers. Even if I do there are issues over the immobiliser which are worrying. I don't have VagCom (should I get one?) to find the error codes.
Does anybody else have any advice please?