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Key not recognized after battery replacement

Replaced battery in key and it not recognised by the car

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Security system not letting van start

Security systems/immobilisers are a nightmare.
Usually it's because the key is not being recognised by the system.

Simple as it may sound, press the 'unlock' button twice - particularly when the key is in the ignition barrel.

Try replacing the battery in the key fob - the remote. Do the simple things first.

Put the key in the ignition. Turn it on/off 5-6 times (no need to try and start the engine..). On the final time leave the ignition switched on for 5 minutes. Hopefully, the system will 'recognise' the key and then allow you to start it.

Failing that, it sounds like a job for a auto electrician

Jan 21, 2016 | Cars & Trucks

1 Answer

My immobilizer does not recognise my key fob

Put key in ignition.
Press unlock button on key fob.
Immobilizer should now recognize it, if it was original fob but car or fob battery was changed or is now low.

Saabs are particular about batteries that are otherwise good, but just below 12 volts.

Mar 29, 2014 | 2005 Saab 9-3 1.8

2 Answers

2008 Nissan Altima not recognizing smart key

Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.

To confirm the problem, the basic troubleshooting is required.

Click this link below and follow the troubleshooting:------


This will help.


Feb 19, 2012 | 2008 Nissan Altima

1 Answer

Ignition locked. Key won't turn.

Yes when you replaced the batteries in the FOB this will have cleared the system identification for the keys.
So have these reset to your vehicle and then you will have no problems.

Aug 07, 2011 | 2003 Mercedes-Benz C-Class

1 Answer

Sephia/Shuma 1999 1,5DOCH. Wont start, few secs after turning the ignition key the immo lamp in dashboard lights on..

replace batteries in remotes and get keys recoded.(the key is not being recognised by the car,immob light comes on...)have you tried the spare key??

Mar 24, 2010 | 1999 Kia Sephia

1 Answer


the power should have been maintained by an alternate source while battery was being chaged so this does not happen. computer needs a talking to now (reprogram) it does not recognize key, thinks car is being stolen.

Dec 11, 2009 | 2002 Jaguar X-Type

1 Answer

BENZ C180 2000

i think your car is not recognising your key.Sometimes the battery runs out and need replacing and if you are not lucky then you may need to contact a dealer to have the key reprogrammed..this will cost you..

Jun 17, 2009 | 2000 Mercedes-Benz C-Class

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