Fiat Stilo 1.6: Engine Controller Issues (IAW 5NF T9) - Car Security Failure, P1120/P1121 Errors

I bought a used IAW 5NF T9 engine driver cleaned. After installing and attempting to start the car, the engine failure lamp lights up, the message "Car security failure" on the display. After connecting via ELM 327, it saved an atmospheric sensor error, P1120 P1121 and a pending lambda probe error. I called the seller with this problem, he said it was normal. After clearing the errors, the car fired, and for a few days it was ok. A few days ago the same situation happened, the first time I tried to start it stilo. The second time it fired up normally and it's been several days now. The seller complains that the driver is certainly functional, comes from the car after the accident and apparently nothing has happened before. The previous driver that was in my Stilo was, IAW 5NF T1, this one is IAW 5NF T9. Apparently they are interchangeable. I can give this driver back. I do not know what to do.
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Give up. These reins break down. Apparently nothing happened and the guest is also complaining ... ???

Or properly fix the driver.

If the driver was not transferred from the engine for a long time, it is probably cold February on the connector (quite popular in this model). If you can solder, you can fix it yourself. Of course, you're talking about your old man, if he is not completely dead, he is sowing errors.

By the way, I will ask what colleague has a vintage year and whether the car does not rust? How much LPG does it burn?
I am asking because I am looking for but for a long time nothing is sensible.

2003. No rust. Petrol. 9l on average

The problem of cold solders is not the main problem of these drivers but their PCB (three path levels) and the BGA connection. As for the software version, IAW5NF.T1 is for the hatchback version and IAW5NF.T9 for the estate version. Soft has a slightly different torque matching the weight of the car.

I mean, they are not interchangeable.

You can change it and the car will work properly just a little differently it will accelerate and that's it.

Is there any difference in strength?

If you ask about PCB design, they don't differ from each other, they just have another program uploaded. Unfortunately, hitting these drivers after so many years in good condition borders on a miracle. Only the use of drivers with Punto or Panda 1.2 IAW5NF.XX HW104 is still sensible with because of their installation in these cars, originally with the side of the battery, not like in Stilo or Doblo on the engine. You only need to lose the software and convert the board because these drivers have two power terminals to control the coils, and Stilo and Doblo have four ignition coils.

Sometimes the cause of errors is a frayed electrical harness under the battery. This is another common ailment of this model.
As for the computer, if someone has conditions, they can flood the PCB with flux and bake so that February can "regenerate".

In the network I found an ad in which someone offers soft at a price of 20 euros.

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