Hi all I replaced my battery in my key fob in my 2013 b max today and now car won't start unlocks and locks.. 

When I start like normal the headlights flash and all the dash lights up on and off whilst holding the button down .. not everytime but now and then on the display says key not inside vehicle 

Many thanks in advance for advice 

The keyless immobiliser part of the fob seems to have been damaged during the battery change.

You should still be able to start by placing the fob in the emergency position.

Open the fob again to see if you can see any damage on the PCB.

Emergency position? I tried where hold it against button and the bit on steering column and both same thing 

13 hours ago, jamiebmax said:

Emergency position? I tried where hold it against button and the bit on steering column and both same thing 

 

On the B-Max the emergency position is shown below.  Will need to be exactly this orientation as the proximity chip doesn't have much range.  If that's what you've been trying then something has gone wrong with the car rather than the key fob, but that seems odd if it was fine before changing the fob battery.  Best advice I could offer there is to get an auto locksmith out.

 

 

 

If you are unable to start your vehicle, do the following.

1. Hold the key next to the steering column exactly as shown.

1. With the key in this position you can use the button to switch the ignition on and start your engine.

Didn't work .. I have taken battery out car got on charge says charging so I assume was low gonna give it 4 hours and hope for the best.. car doesn't get used often haven't started it in a month so can't see what's drained the battery tbh .. any thoughts if it's battery related read online could be because I leave my Bluetooth on and automatic lights is this right 

 

Issue now resolved the battery was the issue am I best off just getting a new one .. or you reackon be ok .. 

2 hours ago, jamiebmax said:

Issue now resolved the battery was the issue am I best off just getting a new one .. or you reackon be ok .. 

It'll probably go flat again if it's left for another month.  I would suggest replacing it if you're going to use it.

However, if you aren't going to use the car, it may not be worth the expense.  I've left the battery dead on my 'spare' car now until I know it'll get used regularly again.