Lee24

PS - I've learnt a lot about how modern car security works. I'd read that it was possible program new fobs, and that the new fob I bought would contain a clean circuit board ready to be programmed to my car. I didn't realise I was buying an empty plastic case. It was too cheap to be true. Does anyone here know how much Skoda charge for new keys and fobs (programmed and key cut)? I assumed it would be a fortune so did this myself.

@Wino @KeithCheetham Thanks - you're both right. I found the parts of the old fob in the dustbin and the glass cylinder RFID device. It was well glued in so just looked like a lump of black plastic. Holding it close to the ignition started the engine - it has to be really close. Instead of risking breaking the glass by prising it out, I've transferred that part of the plastic shell to the new fob. It's not an exact fit but it works. The new fob made out of bits of the old fob opens the doors and starts the engine. Thanks very much. Lee.

Hello, The buttons on my key fob were wearing out, so I bought a new key fob (a plastic case and blank blade) for £15 from Euro Car Parts, then transplanted the circuit board and blade from the old case to the new one. Now the new fob will unlock the doors, but not disable the immobiliser. The engine will not start with the new fob (even though it has the circuit board and blade from the previous fob). Electronically nothing has changed - it's the same old circuit board. The only change is the new plastic case of the fob. There's only two possible reasons I can think of for this:- The fob (just a plastic case) contains some hidden electronic component the immobiliser needs, or The circuit board has lost settings in the half hour while disconnected for the coin battery while I transplanted it to the new case. How do I make the immobiliser re-recognise the same fob chip its been using for years? Fortunately I've got another working fob and key. Thanks. Lee.