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Audi A4 1.8t AEB Swap - DIY Immo Off, Checksum & 24c02 Programmer Help: Audi 80, AJL Engine

okon19921 6750 11
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  • #1 17001045
    okon19921
    Level 10  
    Posts: 11
    Rate: 4
    Board Language: polish
    Hello, I have been browsing foreign forums for a long time in search of a wonderful recipe for immo off. I am a self-taught person, I made a swap for an audi 80 on a 1.8t aeb engine. I paid a lot of money for the driver with immo off done, but ajl (spare) but still I can't figure out how to do immo off I have a simple cheap 24c02 bone programmer and I can even read this bone, I can't edit the file properly, There is maybe some a specialist who could briefly explain to me what is the deal with this checksum ?? I can put my dice file and compare it ready as if someone was able to help and do it. The driver from ajl of course works but I don't want to take it on the table due to difficult availability.
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  • #2 17001182
    spinacz
    Level 42  
    Posts: 8519
    Help: 1190
    Rate: 2611
    Board Language: polish
    It is still important which year because there were two versions of the drivers.
    1995-1996 M3.2.1
    1997-> M3.8.2
  • #3 17001190
    okon19921
    Level 10  
    Posts: 11
    Rate: 4
    Board Language: polish
    Motronic 3.8.2 98r
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  • #4 17001246
    spinacz
    Level 42  
    Posts: 8519
    Help: 1190
    Rate: 2611
    Board Language: polish
    As far as I know, this driver is done in two ways.
    Enter the number of the driver but Bosch, or upload his photo.
  • #5 17001252
    okon19921
    Level 10  
    Posts: 11
    Rate: 4
    Board Language: polish
    0261204805 bosch
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  • #6 17001261
    spinacz
    Level 42  
    Posts: 8519
    Help: 1190
    Rate: 2611
    Board Language: polish
    Buddy, don't you have 27C1024 there?
  • #7 17001708
    melas
    Level 31  
    Posts: 1552
    Help: 138
    Rate: 683
    Board Language: polish
    There are two options.
    Or you have IT knowledge and skills and you figure it out from the bits and the bytes side. Then something cheap to put it in the bone.
    Or the second option - you buy good programmers plus software and they do it for you, and you only have to connect the bone or Procek well.
    There must be a job for everyone! Fortunately, it is complicated and makes it difficult for not every repairer Janusz to become a certified mechanic, car electronics.

    Added after 2 [minutes]:

    And by the way, I will ask how much is this pile of money.
  • #8 17002623
    okon19921
    Level 10  
    Posts: 11
    Rate: 4
    Board Language: polish
    Komp ajl came out 700+ shipping If it's such a problem with help, because I can already see great excitement and comparison to Janusz, I can handle it myself
  • #9 17003039
    melas
    Level 31  
    Posts: 1552
    Help: 138
    Rate: 683
    Board Language: polish
    There is nothing to float, just this viewer is available, but it costs money at the beginning, I suggest you buy access to immobypas there you have nice described and helpful data.
  • #10 17003143
    okon19921
    Level 10  
    Posts: 11
    Rate: 4
    Board Language: polish
    I did it, I am not very floating, I am simply annoyed by such a statement Janusz. I make a car out of passion, not for earnings, in the meantime, I often learn from mistakes, but I like to have satisfaction from the deeds I have done. aaa and maybe it will make immo easier for someone, however, on 24c02
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  • #11 17008430
    piotrekwoj1
    Level 43  
    Posts: 10313
    Help: 925
    Rate: 3358
    Board Language: polish
    There is nothing to hover, I will tell you that practically what the driver is, the immo sits elsewhere.
  • #12 17078564
    okon19921
    Level 10  
    Posts: 11
    Rate: 4
    Board Language: polish
    I agree here, I bought a few computers and I will slowly come to the truth :)
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Topic summary

✨ The discussion revolves around the challenges faced by a user attempting to perform an "immo off" procedure on an Audi 80 after swapping in a 1.8T AEB engine. The user seeks assistance with editing a 24C02 EEPROM file and understanding checksum requirements. Participants highlight the importance of the ECU version, noting differences between Motronic 3.2.1 and 3.8.2 systems. Suggestions include using a better programmer and software for the task, as well as the potential need for specialized knowledge in electronics. The user expresses frustration with the complexity of the process and the high costs associated with obtaining a pre-modified ECU.
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FAQ

TL;DR: For Audi 1.8T AEB swaps, there are 2 ECU generations; “there were two versions of the drivers.” Match your year to the right Motronic before any immo-off work. [Elektroda, spinacz, post #17001182]

Why it matters: Picking the wrong ECU strategy wastes time, risks non-starts, and complicates checksum edits for DIYers.

Quick-Facts

Quick Facts

Which ECU version should I expect on an Audi A4 1.8T AEB swap?

Expect two families by year: 1995–1996 use Motronic M3.2.1, and 1997 onward use Motronic M3.8.2. As one expert put it, “there were two versions of the drivers.” This split dictates your immo-off approach and memory targets. [Elektroda, spinacz, post #17001182]

Is Motronic 3.8.2 correct for a 1998 AEB engine?

Yes. A 1998 AEB setup in the thread is explicitly identified as Motronic 3.8.2. If your car is 1998, align your tooling and procedures with M3.8.2 expectations before touching EEPROM. [Elektroda, okon19921, post #17001190]

What Bosch ECU number often appears with this swap?

Bosch 0 261 204 805 is cited by the swapper. Use the Bosch number to confirm hardware before reading memory or editing immobilizer data. Matching the number avoids chasing the wrong pinout or chip map. [Elektroda, okon19921, post #17001252]

Where’s the immobilizer data stored on these ECUs?

Location is driver-dependent. One contributor noted that, depending on the specific driver, “the immo sits elsewhere.” Treat each ECU as unique until you verify storage, or your edit can fail. This is the key edge-case to watch. [Elektroda, piotrekwoj1, post #17008430]

Can I do immo off with a cheap 24C02 programmer?

Yes, users report success working directly on the 24C02. The OP later confirmed progress and noted it “will make immo easier… however, on 24c02.” Expect to handle checksum correctly during edits. [Elektroda, okon19921, post #17003143]

Do I also need to handle a 27C1024 chip on this ECU?

Some versions include a 27C1024 EPROM in addition to the 24C02 EEPROM. If present, plan your workflow to read both devices before changes. A forum reply specifically asked, “don’t you have 27C1024 there?” [Elektroda, spinacz, post #17001261]

How do I quickly identify my ECU before editing?

Follow this quick check:
  1. Read the Bosch number off the ECU label.
  2. Share or compare that number when asking for immo-off guidance.
  3. Proceed only after method confirmation for that exact number. “Enter the number of the driver but Bosch” was the advice. [Elektroda, spinacz, post #17001246]

Can an AJL ECU run my AEB swap in a pinch?

Yes. The thread author ran an AJL ECU as a spare and reported it worked, though availability was limited. If you do this, keep your original unit safe, as sourcing can be difficult later. [Elektroda, okon19921, post #17001045]

How much should I budget for a spare ECU for testing?

One data point: an AJL ECU cost “700 + shipping.” Prices vary by market and availability, but this gives a realistic expectation for a functioning spare used during swaps or diagnostics. [Elektroda, okon19921, post #17002623]

Should I invest in pro programmers or keep it DIY?

Two paths were outlined: build IT skills and handle bits/bytes yourself, or buy quality programmers with matching software. The commenter emphasized that capable tools and correct connections make the job straightforward. [Elektroda, melas, post #17001708]

Where can I find documented immobilizer-off procedures?

A member suggested purchasing access to a dedicated database (immobypas) with clear, helpful data. Centralized guides can save time when checksum handling or chip maps are unclear. [Elektroda, melas, post #17003039]

What is the 24C02 chip in this context?

24C02 is the serial EEPROM the OP read with a simple programmer. It often holds immobilizer-relevant data for the edit. Confirm your ECU’s storage map before writing changes. [Elektroda, okon19921, post #17001045]

What is the 27C1024 chip mentioned here?

27C1024 is a UV-erasable EPROM present on some boards. If your ECU has it, your workflow may involve reading that EPROM in addition to the 24C02. Verification prevents mismatched files. [Elektroda, spinacz, post #17001261]

Why do checksum edits matter when disabling the immobilizer?

The OP flagged checksum handling as the stumbling block. If you read and edit the EEPROM, you must account for checksum or the file will not be accepted. Plan your tooling around that need. [Elektroda, okon19921, post #17001045]
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