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[RileyRomius]

Hey, my car is no longer recognising my key so the immobiliser won't deactivate. The starter motor still cranks the engine over and the central locking still works but she's not firing. Any ideas?

[hercules]

check if the chip hasn't fallen out of your key I think ive read on here before,have you just changed the batteries

[omegod]

is the immobiliser light on the dash flashing while it's cranking?

[RileyRomius]

Hey, I haven't got a spare battery for the key but I'll change it tomorrow and re check. And yes the light is flashing. It starts flashing as soon as the ignition is at the second stage and continues while its cranking.

[hercules]

I think what can happen is the chip can fall out when you change the battery,someone will be along soon with an answer 

[RileyRomius]

Aye well does the chip require the battery to actually send the signal and deactivate the immobiliser? If so then a battery change may do it as my remote locking stopped working a few days ago. Fingers crossed!

[Andy B]

Aye well does the chip require the battery to actually send the signal and deactivate the immobiliser?  .....

No. The battery is just for the remote locking.

Have you checked that the chip is actually inside the horse shoe part of the key?

[RileyRomius]

I believe it's still there, is the chip the small black thing wedged in the corner?

[Andy B]

I believe it's still there, is the chip the small black thing wedged in the corner?

Yes. 

[RileyRomius]

Yes it's still in there, I assume this is bad as it means there is something more sinister going on? 

[Andy B]

Yes it's still in there, I assume this is bad as it means there is something more sinister going on? 

I'll have to pass ..... immobiliser problems weren't a problem I ever had 

[RileyRomius]

Ah no problem, thank you anyway! I've had a fiddle with the key and chip and I'm going to change the battery so you never know, with a stroke of luck it may do the trick.

[TheBoy]

Changing batteries won't help. The chip is a self powered transponder, thus doesn't need power. Check it isn't loose.

Also, check for any assortment for crap around ignition switch, which is where the immobiliser ecu is.

Beyond that, it probably needs a chat with a tech2 to find out whats wrong.

[deviator]

The orientation of the chip in the key can make a difference. (If it's been removed)

You could also try removing the chip (I recommend attaching some cellotape folded back on it's self to make it bigger and prevent loss) and wave it around the ring near the key hole. You could even remove the column and try it on/next to the black box and ring. If it still doesn't recognise it, then as above.

[powerslinky]

I'm guessing from the above posts, that the  battery in your fob has failed. 

Renew the battery & hopefully the cental locking will work.

Do a reset  on the door locking by sitting in the car with ignition on II & press the locking button on the fob & all doors should lock & then unlock .

Remove key from ignition  . . . . then using the fob, operate locking again to lock ( you can do this from inside or outside the car)   . . .

Then operate to unlock  . . . then  put key back in ignition & it should start hopefully 

Had this happen on my last 2.6    but can't remember who advised this solution  . . . but it worked

Sounds crazy . .  . but worth a try