OK, here is the issue.
Ford Focus 1.8TDi on a 53 plate in the UK (2003 model). Battery was on the way out, so replaced. Just after that the speedo stopped working. Assumed the VSS, so replaced it, but problem still there. The weird thing is, the speedo works fine if the outside temperature is above circa 20 degrees, but does not work if the temperature is below this. When the temperature is below this it works sometimes, but mostly not. When the speedo is not working the car does idle higher between gear changes, though I assume this is because the cluster is not getting any speed information. Returns to normal when the speedo starts working again. Also, as I drive along, if I switch off the ignition and then switch it back on again, the speedo starts to work, but very erratically.
Bad earth maybe?
Car also recently had a new cluster, so assume that not to be the problem.
I am pretty technically minded, but not a trained mechanic, so please keep replies fairly simple.
Any advice very much appreciated as I refuse to be beaten and think the whole outside temperature issue must be a big clue to someone out there with good technical knowledge.
chrisrigbyMember Since 24 Jun 2012
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