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durtydurty

Immobiliser light flashing on A4 and wont start!!

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My dad phones me this morning saying the diesel light on his 99/V A4 Avant is flashing at him and the car is turning over but not running. So I tell him to read the book and see what it says. Anywho it turns out its the immobiliser light ( it would help if he wore his glasses whilst doing these things! )

So the car turns over but wont run, like one of the keys has reset and the car isnt recognising the key so wont start. He has tried all the keys but with no luck!

Any ideas on what else he can try or any ideas in general?

Thanks! jump.gif

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It's usually the reader coil on the ignition barrel, or the wire that goes to it is broken or frayed. Worth taking the cowling off and having a look 169144-ok.gif

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Okay, will tell him to have a look and come back to you.

I knew it was the right thing to do posting it on TSN 169144-ok.gif

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Taken the cowling off and says nothing obviously hanging down or frayed!!

Dad was amazed that the local Audi dealer couldnt see it for three days! There are other people out there other than you Dad who want there car serviced and worked on.

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Don't know how much the reader coils are or where they plug in on a B5, but it should be pretty obvious to find.. might be worth replacing it himself if it's as cheap as I think it is (sub £30) and seeing how he gets on.

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On my A6 ( 1998 )when this happened the AA showed me a trick to reset. No idea if this will work on your A4 but it's worth a try. Basically you need to leave the ignition on for upto 20 mins and it will re-synch the key / immoboiliser. I had to use that trick a couple of times and sometimes it did it much quicker than 20 mins. You'll know when it has worked (if it does) as the immobiliser light stops flashing.

If that doesn't work then the other trick I used was to adjust the steering wheel up/down and in/out a few times and this seemed to work (as if the movement helped the coil make the contact to the key).

For some lucky reason (I'm knackered now I've said that) mine hasn't had a problem for over a year or two now.

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Dad has just had it recovered to Audi so we'll see what happens.

They also mentioned the coil thing so fingers crossed.

Thanks for the advice and will update accordingly.

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Had a fault a few years ago on my B5 A4 - Audi said it was the reader coil and replaced with a temp one (had to wait for one to come from Germany for coding issues) - long story but turned out it was the engine management chip not the coil (this was after having 3 coils replaced) needless to say they didnt charge me for the new ECU.

Aparantley the coil failing is quite a common problem - cost was £100 fitted going back about 7 years.

From what i remeber Audi did say that it can some times be fixed by putting the key in the other way round so the sender in the key fob is closer to the reader - not sure how true this is though.

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They recoded both keys and its works fine! Very Odd.

Thanks for all the input guys.

Much appreciatted.

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On 1/28/2008 at 1:26 PM, nicknick said:

On my A6 ( 1998 )when this happened the AA showed me a trick to reset. No idea if this will work on your A4 but it's worth a try. Basically you need to leave the ignition on for upto 20 mins and it will re-synch the key / immoboiliser. I had to use that trick a couple of times and sometimes it did it much quicker than 20 mins. You'll know when it has worked (if it does) as the immobiliser light stops flashing.

If that doesn't work then the other trick I used was to adjust the steering wheel up/down and in/out a few times and this seemed to work (as if the movement helped the coil make the contact to the key).

For some lucky reason (I'm knackered now I've said that) mine hasn't had a problem for over a year or two now.

Thank you VERY VERY MUCH. I have just registered to this forum just to tell you thank you for the advice, it totally worked on my Audi A4 from 2002. First my issue was the immobilizer light flashing all the time and i have used both spear and normal key and nothing happened. Then I decided just to re-program the key, but that failed and the alarm would not stop. I have removed the battery for a night and this morning i have managed to turn off the alarm and re-program the key. After that the immobilizer light kept flashing and also the electronic stabilization light flashed and stayed on. I have left the key for 20 minutes as you have suggested and got away from the car so i dont know if less than 20 minutes would have fixed the issue or not but when i got back the immobilizer light was off and i was able to turn on the car. After a while the electronic stabilization light went off too so now the car is save and running. 

 

You just saved me 240 pounds membership to AA, they have asked for that much since my car is already broken and its in front of my house!!! Thank you again!!!

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