Forgotten ZX Immobiliser Code

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Rhothgar
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1996 Citroen Xantia 1.9TD SX S1 - N707 MGP (Currrently laid up)
2000 Citroen Xantia 2.0 HDi S2 - X435 JGJ VF7**************[VIN obfuscated, can be read by forum staff] (Clutch died Dec 2017 - Resurrected Easter Sunday 2021)
1997 Citroen ZX SX TD - P788 AJL
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Oh! and two Harley Davidsons - A 1990 Sportster and a 2003 Fatboy 100th Anniversary (the only vehicle I have owned from new)
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Forgotten ZX Immobiliser Code

Post by Rhothgar »

Afternoon all,

It's been about 4 years since Sylv's ZX has been on the road. We cannot remember the code for the life of us.

It states in the manual that it locks for 30 minutes but it doesn't. It locks for probably about 15 minutes.

We've tried all the ones we think it is. Perhaps I should start writing down every attempt and rule it out for next time. This could take a long time.

Is there anyway of finding or changing the code with a Lexia? The ZX has limited connectivity in terms of what it will read though I have to admit I can't remember if I've ever plugged it in. I know I have my old Xantia which gives hardly any information you can't guess.

When I press the numbers, each press causes a beep. Before any keys are pressed the light is red. According to the manual this just means the immobiliser is active. Once I have entered a four digit code, it pauses before the green light comes on (along with the steady red) which shows the wrong code has been entered.

It was a long time ago but when the correct code is entered, does the red light extinguish and you get a solid green light?

Thanks in advance though I am not entirely sure where this will end. If necessary, send PM.

I certainly don't want to have to take the pump off to remove the armour and bypass. Would love to get it working again.

I suppose there is only 10,000 combinations to go through.
RichardW
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Re: Forgotten ZX Immobiliser Code

Post by RichardW »

I don't think there's any official way of recovering the code. Red and green lights together is indicative of a power or earth fault though I think - if the wrong code is entered then it should beep and display red only. It is 10 years since I had one of these though!
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Re: Forgotten ZX Immobiliser Code

Post by xantia_v6 »

Which engine does it have? This will govern your more serious options. There is no easy solution.
Rhothgar
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Location: Nottingham - UK
My Cars: 2013 Peugeot 3008 Allure 1.6HDi - FD63 FWA VF3**************[VIN obfuscated, can be read by forum staff]
1995 Citroen Xantia 1.9TD S1 - M728 GDL VF7**************[VIN obfuscated, can be read by forum staff]
1996 Citroen Xantia 1.9TD SX S1 - N707 MGP (Currrently laid up)
2000 Citroen Xantia 2.0 HDi S2 - X435 JGJ VF7**************[VIN obfuscated, can be read by forum staff] (Clutch died Dec 2017 - Resurrected Easter Sunday 2021)
1997 Citroen ZX SX TD - P788 AJL
1959 Landrover Defender S2 - Two owners from new
1968 Triumph Vitesse Convertible 2.0
1980 Ford Escort RS2000 Customer - 2nd Owner
1988 Saab 900 T16S - A 1980's exercise in understated Hooliganism...
Oh! and two Harley Davidsons - A 1990 Sportster and a 2003 Fatboy 100th Anniversary (the only vehicle I have owned from new)
x 78

Re: Forgotten ZX Immobiliser Code

Post by Rhothgar »

Thanks for the replies.

All sorted now. Kept disconnecting the battery and trying different codes that we thought it might be.

Prime the diesel circuit. Car started first time. Last time was around October/November 2013. Not bad, is it?

Idling very lumpy though. A couple of leaks seem to have developed around two injectors. Will investigate if we put it back on the road.

All the best, all.
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Re: Forgotten ZX Immobiliser Code

Post by Saraphee »

Very easy to remember the code, in my part of the world most cars have a reg plate which includes 4 numbers.
I just key mine in backwards!
dnsey
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Re: Forgotten ZX Immobiliser Code

Post by dnsey »

Observing which buttons are slightly worn narrows down the odds considerably.
Rhothgar
Donor 2023
Posts: 1758
Joined: 22 Nov 2004, 00:21
Location: Nottingham - UK
My Cars: 2013 Peugeot 3008 Allure 1.6HDi - FD63 FWA VF3**************[VIN obfuscated, can be read by forum staff]
1995 Citroen Xantia 1.9TD S1 - M728 GDL VF7**************[VIN obfuscated, can be read by forum staff]
1996 Citroen Xantia 1.9TD SX S1 - N707 MGP (Currrently laid up)
2000 Citroen Xantia 2.0 HDi S2 - X435 JGJ VF7**************[VIN obfuscated, can be read by forum staff] (Clutch died Dec 2017 - Resurrected Easter Sunday 2021)
1997 Citroen ZX SX TD - P788 AJL
1959 Landrover Defender S2 - Two owners from new
1968 Triumph Vitesse Convertible 2.0
1980 Ford Escort RS2000 Customer - 2nd Owner
1988 Saab 900 T16S - A 1980's exercise in understated Hooliganism...
Oh! and two Harley Davidsons - A 1990 Sportster and a 2003 Fatboy 100th Anniversary (the only vehicle I have owned from new)
x 78

Re: Forgotten ZX Immobiliser Code

Post by Rhothgar »

@citrojim

Would you believe it?

Read above. Looks like we managed to get it started before. I cannot remember ever getting it to start.
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