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1995-2002 Range Rover P38A
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31 Posts
Discussion Starter #1
I have just one key for my P38 which is getting a bit tired. Does anyone know where I can get another complete key and fob in the west Yorkshire area.
I have spoken to a few auto locksmiths but to no avail.
Being a poor working lad, I cant afford main dealer prices.
Your help would be gratefully appreciated.
 

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1995-2002 Range Rover P38A
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1995-2002 Range Rover P38A
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3,952 Posts
Main dealer is your only option. You can get a new blade cut from the code which your main dealer will be able to provide you with (you'll need a decent locksmith with the computer controlled cutting machine, the P38 key is listed under BMW) and you can get refurb kits for the fob on eBay. But, a complete working spare key is only available from Land Rover and not cheap (although cheaper than the £238 my missus was quoted for a spare key for a Merc).
 

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1995-2002 Range Rover P38A
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31 Posts
Discussion Starter #4
I think I need to get a second complete key then get my existing one refurbished as the micro switches are temperamental. If I could kill the immobiliser I could just use the key without the remote but not sure how to do that.
 

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To use only mechanical blade to open doors (have possibility to start the engine without EKA entering) you have to connect car into diagnostic system (i.e. Autologic, Nanocom) and at BeCM section, passive immobilisaton function has to be disabled.
Of course your driver doors latch has to be in good order (microswitches) to recognized that latch is forced in mechanically way to be open. When immo is disabled then sync procedure (if you potentially need to sync your existing fob) can be realized only by oldschool method -by pushing key on fob and mechanicall open/close the latch (automatic synch procedure on 1999+ cars are disabled when immo is deactivated).
 

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1995-2002 Range Rover P38A
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My mistake ......... I misread and didn't realise he wanted a spare.
 

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LEGACY VENDOR
1995-2002 Range Rover P38A
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4,198 Posts
I had to buy 3 of them earlier this year... 2 to replace ones that were stolen from my workshop for my project P38's... and the third was a spare for my own RR..

Still, it's cheaper than new keys for a lot of vehicles, including the newer RR's!
 

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1995-2002 Range Rover P38A
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31 Posts
Discussion Starter #10
Its looking like I will have to bite the bullet and get a new one. Love my P38, but its a money pit.
 

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1995-2002 Range Rover P38A
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31 Posts
Discussion Starter #11
Great news!!!
I contacted David Stock at www.alarmremotes.co.uk
He sent me a code catcher which I returned and my new key came back all within about 8 days.
Worked first time and all for just under £90.
Result :dance:
 

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LEGACY VENDOR
1995-2002 Range Rover P38A
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4,198 Posts
Is it a different key number, or is it just a copy of the one you already have?
 

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1995-2002 Range Rover P38A
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31 Posts
Discussion Starter #13
Its a copy of my existing one that is working badly. I had to get the blade cut when it arrived but the electrical bits are all new and work great.
 

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1995-2002 Range Rover P38A
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1,410 Posts
First of all, I must say I am no expert in this, but the p38 key fob has a rolling algorithm. The number changes with each key press does it not? It also remembers the last one hundred codes I believe.
So if if the fob is just cloned, the clone will only transmit the one copied code. If it gets out of sync, it will no longer work?
 

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LEGACY VENDOR
1995-2002 Range Rover P38A
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4,198 Posts
First of all, I must say I am no expert in this, but the p38 key fob has a rolling algorithm. The number changes with each key press does it not? It also remembers the last one hundred codes I believe.
So if if the fob is just cloned, the clone will only transmit the one copied code. If it gets out of sync, it will no longer work?
The code grabber will read the encrypted transmission, yes, and I am guessing it probably needs a few captures for it to then work out the algorithm - once this is known you can then program a replacement fob to the same algorithm as what was captured - so it will roll as the factory one will.

The only difference to a different key # is that you could only have the original or the replacement synced to the vehicle at one time, as the BECM will decode the transmission and then know what the key ID is that has been sent (which will be the same as programmed to the new fob).

I now know how the KEY ID, BECM FOB code and all of that side of things work, and have a FOB checker that will tell me what the ID of a particular fob is (so I can work out what key number it is, if the sticker is missing) - but I haven't yet managed to work on anything from the other side of being able to know how the rolling code is generated or the fob ID is then sent as part of the encoded transmission.

Marty
 

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1995-2002 Range Rover P38A
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Discussion Starter #16
Hi Dave and Marty, I am no expert in these things.
All I know is that it works a treat as does the existing one, so job well done for me.
 

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LEGACY VENDOR
1995-2002 Range Rover P38A
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4,198 Posts
Hi Dave and Marty, I am no expert in these things.
All I know is that it works a treat as does the existing one, so job well done for me.
Good stuff, and definitely cheaper than one from LR!
 

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Premium Member
1970-1995 Range Rover Classic
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455 Posts
Good stuff, and definitely cheaper than one from LR!
Marty, I don't have a p38 key here right now so I have to ask.
I suppose the Information is stored in an EPROM at production, like in the BMW keys.
Do you know which one?

In that case we could do the individual programming wherever we are and we could just order a batch of virgin keys, the blade yet to be cut and the EPROM to be written

That would be extremely helpful to know
 

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Premium Member
1970-1995 Range Rover Classic
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455 Posts
...

The only difference to a different key # is that you could only have the original or the replacement synced to the vehicle at one time, as the BECM will decode the transmission and then know what the key ID is that has been sent (which will be the same as programmed to the new fob).

I now know how the KEY ID, BECM FOB code and all of that side of things work, and have a FOB checker that will tell me what the ID of a particular fob is (so I can work out what key number it is, if the sticker is missing) - but I haven't yet managed to work on anything from the other side of being able to know how the rolling code is generated or the fob ID is then sent as part of the encoded transmission.
(y)
I have an idea. The man who taught me how to make BMW keys and how to adapt the code is another wonderful Martin in Czechia.

As he is the best BMW specialist I know he certainly can help us.. please help me with more detail.. I will then know how similar it is to BMW who, after all, designed the P38 electronics.
 

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Super Moderator
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2,078 Posts
No they didn't, Siemens designed and built the fobs and receivers and supplied them to BMW and Land Rover.
 
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