Immobiliser problems (Yellow key code light) - Alfa Romeo Forum
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  #1 (Post Link)  
Old 16-06-07
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Alfa 147 1.6TS

Immobiliser problems (Yellow key code light)

My 156 is giving me intermittant starting problems as follows. Every so often when i turn the key to start the engine it turns over but after 5 or 6 seconds fails to fire and start up. If i return the key to stop and try it again it always starts. The weather is nothing to do with it as this morning it started first time after being out in the rain all night. I have made several journeys today which involved starting the car 5 or 6 times throughout the day with no problems at all. However tonight it failed to start at the first attempt but did start at the second attempt. This has been happening for several weeks. Some days the car will start first time all day. As previously stated if it does not start at the first attempt it does 100% at the second attempt. The battery is nearly new and will trying to start it you can hear there is loads of life in the battery. I spoke to Jamie at Alfaworkshop in Royston who asked me if the yellow key code light stayed on when i was having trouble starting. I told him i did not notice but will look at the key code symbol everytime i start up. Jamie said this light should only come on for a split second at start up and if it stays on it does not matter how long i try to start the car if this light stays on the car will never start. The yellow key code light apparently is the immobilser. When it failed to start tonight the yellow key code light stayed on. At least i now know that the starting problems are to do with the immobiliser. My question is what do i need to get done to cure this problem? Is it just a case of having the code in the keys redone? If so how much will this cost? I assume it is going to be a lot cheaper than if it was a problem with the starter motor etc. Is there anyone else who have had this problem.
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  #2 (Post Link)  
Old 16-06-07
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Re: Immobiliser problems (Yellow key code light)

Hello Have you got a spare key to try?
As the ECU has a sensor located near the ignition barrell which checks the transponder inside the key.
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  #3 (Post Link)  
Old 16-06-07
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Re: Immobiliser problems (Yellow key code light)

Originally Posted by allan156 View Post
Hello Have you got a spare key to try?
As the ECU has a sensor located near the ignition barrell which checks the transponder inside the key.
Hi. I have a spare key but the problem happens no matter which one i use and one is not any worse than the other.
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  #4 (Post Link)  
Old 16-06-07
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Re: Immobiliser problems (Yellow key code light)

Connector between the antenna around the key barrel and the Code ECU under the dash near the fusebox.
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Old 16-06-07
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Re: Immobiliser problems (Yellow key code light)

Originally Posted by David C View Post
Connector between the antenna around the key barrel and the Code ECU under the dash near the fusebox.
Hi David. I have seen some posts previously relating to this Antenna. If i remember right do you have to move it closer towards the key barrel?
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Old 16-06-07
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Re: Immobiliser problems (Yellow key code light)

No, it is around the key barrel.
You just have to make sure the connector is pushed together properly.
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  #7 (Post Link)  
Old 16-06-07
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Re: Immobiliser problems (Yellow key code light)

Originally Posted by Lunatic Flea View Post
Hi David. I have seen some posts previously relating to this Antenna. If i remember right do you have to move it closer towards the key barrel?
I think i am all sorted. I spoke to Jamie Porter at Alfaworkshop this moring as he was the one who asked me to keep an eye on the key code light. He told me to look for the code box re: the immobiliser which is above the fuse box. Jamie said to unplug the connecter and reconnect it 2 or 3 times. I fiddled about in the fuse box moving some wires to the side but could not fine this box. He said it was around 3" x 3" x1". I give up looking for it as i had to go to town. Problem was when i went to start the car it would not start and the key code light remained on. I did not worry as it alwys started at the second attempt. However it did not start on the second or third or fourth attempt and the jey code light remained light while trying to start the car s**t!!!
I went to town in my wifes car and when i returned i was determined to find this bloody box. I eventually found a 3" x 3" x 1" black box not directly above the fuse box but to the left/ I had to use a torch and a mirrir to find it. It had a plug at each end. I removed both and plugged them in 3-4 times. Low and behold the car started first time and has done half a dozen times since then.Jamie said "The contacts corrode and it gets a bad signal to the code box" I guess the reason i had to unplug and plug it in several times was to get a better connection on the connectors. It must be the right box as it started straight after removing these plug and one of the connectors wires lead up towards the ignition barrel. I still don't know why after my first search the car would not start even though i failed to find the box. Maybe while i was blindly sticking my had up behind the fascia i moved one of the wires leading to the connector into the black box, and if the connection was not that great this might by the reason.
Might be worth checking the connector that you mentioned and making sure they are properly connected.
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  #8 (Post Link)  
Old 05-03-08
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Re: Immobiliser problems (Yellow key code light)

Hiya,think maybe this could be similar to my problem (156 V6).Yellow code light on with red injector light on intermittantly!,will not start in this condition!.I'll try cleaning connections .Dealer has ordered Code card to try & cure this problem,lets hope i cure it first.Can any one recommend a vat registered garage in Birmingham area,ta.
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  #9 (Post Link)  
Old 23-07-08
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Re: Immobiliser problems (Yellow key code light)

hey there Gaz, how did you get on with your issues? I have the same problem as you seem to have had here. Could you let me know what finally resolved the problem? Was it injector or code related? Cheers (I'm assuming and hoping for your sake this is fixed!!!)
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  #10 (Post Link)  
Old 24-07-08
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Re: Immobiliser problems (Yellow key code light)

OK, my issues were also immob box related. Wiggled the connector a couple of times and it starts first time every time now, cheers.
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  #11 (Post Link)  
Old 16-07-09
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146ti 2.0

Yellow Key Code Light

My 146ti 2.0 is turning over but won't fire. The yellow key code light stays on. Any ideas would be appreciated. Thanks
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  #12 (Post Link)  
Old 16-07-09
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S/w 'Dave' & a Selespeed

look for a thread by me called' immobilser guide to fixing'
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  #13 (Post Link)  
Old 18-07-09
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Hey, thanks for that. It wasn't quite the same on the 146 but the principle checked out. Hopefully, its just a basic electrics problem to solve now. Thanks again
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  #14 (Post Link)  
Old 28-06-11
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Integgggrale

On my 2000 2.0 TS.
Just pull the connector in and out a few times and all back to normal.

Last edited by the1beard; 24-09-11 at 06:42.
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  #15 (Post Link)  
Old 15-02-12
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does the wire in question go anywhere near the gearstick?i had the yellow light on yesterday after fiddling with my sportronic 166 underneath the gear gaiter.
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  #16 (Post Link)  
Old 16-02-12
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For my problem, the wires in question were strictly up under the console beside the steering column. They could run down there but don't see why they would.
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  #17 (Post Link)  
Old 16-02-12
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Nowhere near the gearstick...
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Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Alfa 147, 156 & GT

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