Was the HG replacement as a result of failure? I recall that when I had HGF in January with the ZTT the garage said the car has to "re-learn" settings and needs time to settle after all the work. They ultimately resorted to setting it up on the T4. However that didn't solve the problem of rough tick over with the engine cuttting out briefly from cold. Nothing showed up on the diagnostics and by a process of elimination the garage found the tappets at fault. New tappets and all sorted.
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