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Vectra C Key Replacement Issues: Immobilizer Error, LED On, Car Icon & Padlock, Immo Coil Repair

dbs123 15450 17
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  • #1 16908216
    dbs123
    Level 9  
    Hello,
    I was replacing the button on the VECTRY C key. After pressing the buttons, the LED is on. However, I accidentally peeled off the immo coil. And now, after inserting the key into the ignition, the car icon with the padlock lights up and you can not start. Does this immmo coil have to be glued to the plate? Because she probably isn't soldering to her.
    Could she decode ??
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  • #3 16908235
    Strumien swiadomosci swia
    Level 43  
    Measure the resistance of the coil as it is infinity, buy the same key and solder the coil.
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  • #4 16908240
    dbs123
    Level 9  
    Hmm ... it's weak ... no conductive terminals come out of this coil, i.e. at least I can't see them. hmh what's the cheapest way to fix this? buy a new key with such a coil and programming somehow / somewhere?
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  • #5 16908254
    SQ9MEM
    Level 29  
    I have the impression that you have no idea what you are doing. The coil is soldered in places marked with red arrows. And there are solder fields there.
    Vectra C Key Replacement Issues: Immobilizer Error, LED On, Car Icon & Padlock, Immo Coil Repair
  • #6 16908256
    dbs123
    Level 9  
    And how do I measure how nothing conductive is sticking out of the coil?

    Added after 3 [minutes]:

    And ok. On the board I have as if clamping clamps from this coil ...... so I won't save it anymore. or replacing the key? For example, if I buy a used one, how much can it cost to reprogram? Unless I can do it in a "home" way?
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  • #7 16908267
    Strumien swiadomosci swia
    Level 43  
    Transfer the coil from another remote control to the guest what he can solder and after the problem, nothing more.
  • #8 16908283
    dbs123
    Level 9  
    hm i don't need to program it to immo in the car?
  • #9 16908287
    robokop
    VIP Meritorious for electroda.pl  
    There's no need to. This coil is just an antenna.
  • #10 16908293
    dbs123
    Level 9  
    hmh ok, i.e. the coil must be from the same remote control? i.e. also vectra c?
  • #12 16910864
    Strumien swiadomosci swia
    Level 43  
    dbs buy the pilot, solder the coil and close the topic.

    If the guest does not know what he is selling, do not buy from him, you can also come to the key service after Christmas and it will also overwhelm you.
  • #13 16910901
    dbs123
    Level 9  
    The pilot costs PLN 100-200.
    I am looking for the cheapest option.
  • #14 16911179
    Strumien swiadomosci swia
    Level 43  
    Do not do the barn key without the ignition is 30-45 PLN. In addition, parts for VC do not belong to the Fiat 126p price shelf.
  • #15 16911205
    CAR pass
    Level 20  
    What about coil reflector?
    I also see help you want him
    Look, buy the cheapest key, I don't know how many 2 or 3 buttons.
    On the board you have the layout you need to transfer yours to the bought one
    The topic is so simple and you write about the coils
  • #16 16911372
    SQ9MEM
    Level 29  
    It may be a simple topic, but if someone asks such a question, there is a poor chance that he would put the SMD chip back.
  • #17 16911529
    CAR pass
    Level 20  
    Well, the immo coil broke maybe out of curiosity or maybe out of knowledge.
    Everyone needs money, but curiosity also costs money.
    Cheap does not mean good and good does not mean that it will be cheap
  • #18 16911637
    grzesiekw12
    Level 22  
    Enter the keyword 'Opel coil' in the Allegro search engine and there are plenty of them, by the way you'll satisfy your curiosity about the leads. I also have a remote control board in which the transmitter system has failed, so the antenna (coil) is ok. It is responsible only for the immo, specifically the antenna that connects to the immobox loop on the ignition switch. The antenna of the remote control central locking is made on the laminate in the form of a printed circuit. If you are not tired in soldering, do not move this pilot, because you will cause yourself more poverty than now.
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Topic summary

✨ The discussion revolves around issues related to key replacement for the Vectra C, specifically after the immobilizer coil was accidentally damaged during a button replacement. Users suggest that the immobilizer coil must be soldered back to the circuit board, and if the coil is not functional, it may be necessary to purchase a new key with a compatible coil. The coil acts as an antenna and does not require programming to the vehicle's immobilizer system. Various solutions are proposed, including transferring the coil from another remote control or purchasing a used key. Users also discuss the costs associated with key replacement and the importance of ensuring compatibility with the Vectra C model.
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FAQ

TL;DR: Vectra C won’t start after key repair? A broken/solder-lifted immobilizer coil is typical; replacement keys run 100–200 PLN. “The pilot costs PLN 100–200.” [Elektroda, dbs123, post #16910901]

Why it matters: This FAQ shows how to restore start-up by fixing or swapping the immobilizer antenna coil—without unnecessary reprogramming—for DIYers and budget-minded owners.

Quick Facts

How do I fix the Vectra C immobilizer error (car + padlock) after key repair?

Restore the immobilizer coil connection. It must be soldered back onto its PCB pads or replaced with a donor coil. If your coil measures open circuit, transplant a coil from another compatible remote and have a competent tech solder it. This resolves the immobilizer light and starting issue. [Elektroda, Strumien swiadomosci swia, post #16908235]

Does the immobilizer coil need to be glued or soldered?

Solder it. The coil connects to designated solder pads on the key’s PCB. Gluing alone will not re-establish the electrical connection needed for the immobilizer to read the transponder. “Soldered.” [Elektroda, tomasz0703, post #16908223]

Do I need to reprogram the car after replacing only the coil?

No. The coil is just an antenna for the transponder. When you replace or re-solder the coil, the immobilizer pairing remains unchanged, so no additional programming is required. “This coil is just an antenna.” [Elektroda, robokop, post #16908287]

How can I test if my immobilizer coil is bad?

Measure its resistance with a multimeter. A healthy coil shows finite resistance. Infinite resistance indicates an open winding, meaning the coil is broken. In that case, replace it or transplant a coil from a similar remote. [Elektroda, Strumien swiadomosci swia, post #16908235]

My coil has no visible leads—how do I proceed?

The leads terminate at the PCB pads. If the pads or clamping areas lifted when the coil was peeled off, repair requires precise micro-soldering or a donor board. If pads remain intact, a skilled tech can reattach a donor coil to those pads. [Elektroda, dbs123, post #16908256]

Can the coil come from any remote, or must it be Vectra C?

You can transplant a coil from another compatible remote. The key point is physical fit and proper soldering to the PCB pads. A technician can handle the swap quickly, restoring the antenna function without coding. [Elektroda, Strumien swiadomosci swia, post #16908267]

What’s the cheapest practical fix?

Transplant a donor coil and have a professional solder it. Buying a whole replacement key often costs around 100–200 PLN, but a solder-only repair is usually less. Ask a key service for a coil swap quote. [Elektroda, dbs123, post #16910901]

Is the remote-locking antenna the same as the immobilizer coil?

No. The immobilizer uses a discrete coil antenna on the PCB. The central-locking RF antenna is a printed trace on the board. Fixing the coil restores immobilizer start, not remote range. [Elektroda, grzesiekw12, post #16911637]

How do I safely swap an immobilizer coil?

  1. Desolder the damaged coil and clean the PCB pads.
  2. Align the donor coil leads with the pads; tack-solder one pad, then the other.
  3. Verify continuity and reassemble the key shell before testing in the ignition. [Elektroda, SQ9MEM, post #16908254]

Do I have to buy a whole key or can I reuse parts?

You can buy the cheapest compatible key and transfer your working layout or components to it. This avoids coding when your transponder electronics are intact. It’s a straightforward parts swap for a competent tech. [Elektroda, CAR pass, post #16911205]

Where can I find a replacement coil quickly?

Search marketplaces using terms like “Opel coil.” There are many listings for immobilizer coils compatible with Opel keys. Verify lead style and dimensions match your PCB pads before purchase. [Elektroda, grzesiekw12, post #16911637]

What if the PCB pads are torn off or damaged?

Pad damage complicates repair. A specialist may need to rebuild pads or run micro-jumpers. If damage is extensive, transferring your electronics to a donor board or shell can be faster and cheaper. [Elektroda, dbs123, post #16908256]

How much should I expect to pay for basic key work?

Some services quote 30–45 PLN for simple key-related tasks, but Vectra C parts and jobs are not in the ultra-cheap tier. Get a firm quote before proceeding, especially for micro-soldering. [Elektroda, Strumien swiadomosci swia, post #16911179]

Will a used key work if I only swap the coil?

Yes. The immobilizer pairing stays with your transponder electronics, not the coil. Move only the coil and keep your original electronics. No coding will be needed after a correct solder job. [Elektroda, robokop, post #16908287]

Someone said the coil needs parameters—what should I match?

Match physical fit and connection style first. Community guidance favors buying a cheap compatible key and transplanting the coil rather than chasing standalone specs. A technician can confirm suitability during the swap. [Elektroda, Strumien swiadomosci swia, post #16910864]
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