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Audi Q7 4.2 TDI CR original file Bosch · 4E1907409B · SW 391821
2007, Turbo diesel, 244.9 kW (333 hp)
This is the factory calibration of the 2007 Audi Q7 4.2 TDI CR (244.9 kW, 333 hp), for its Bosch ECU with part number 4E1907409B and software 391821 (1037391821). Use it to put the car back to standard, to recover the ECU after a failed write, or as the base of a tune of your own.
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About this file
An original holds every map as the factory wrote them: injection quantity and timing, boost and rail pressure, the torque and smoke limiters, the speed limiter and the emissions controls. Tuners start a file from it; workshops use it to put a car back to standard.
The file is listed for the 244.9 kW, 333 hp version of the Audi Q7 4.2 TDI CR. Check the power on your car's papers: the same model was sold with several engines, each with its own file.
This file of software 391821 of the Audi Q7 4.2 TDI CR downloads straight after payment. Another stage of it can be built from your own read by our engineers.
Read the Bosch ECU with your usual tool and keep the read: compare its hardware and software numbers with the ones on this page before you write the file.
DPF off, EGR off, AdBlue (SCR) off, DTC off and speed limiter (Vmax) off can be built on this file on request, for off-road and competition use: send us your read through our file service and our engineers add them (any file £50, from £30 in packs).
Software 391821 (1037391821) is the calibration inside the Bosch ECU. Part number 4E1907409B is the car maker's number for this ECU.
How the Bosch ECU is read
With your usual tool, over OBD or on the bench as the tool allows. Ask us on WhatsApp if you are not sure.
- Read the ECU and keep the read: it is your way back.
- Match the numbers: part number 4E1907409B and software 391821.
- Pay and download: the file is in your account straight away.
- Write it back the way you read it. Not right for your car? We correct it free.
Before you write the file
- A battery charger on the car: a write takes minutes and the voltage must not drop.
- Your own read saved twice, on two different drives: it is your way back.
- Your read shows part number 4E1907409B and software 391821 (1037391821), the same as this file.
- Fault codes read and noted before the write, and cleared after it.
- The same tool and connection you read the ECU with.
Questions
Which ECU does this Audi Q7 4.2 TDI CR original file fit?
A Bosch ECU with part number 4E1907409B and software 391821 (1037391821). Check those numbers in your read before you write it; another software number needs another file, which our engineers can build from your read.
How is the Bosch ECU read and written?
With your usual reading tool, over OBD or on the bench as the tool allows. Write the file back the same way you read the ECU, and keep your original read.
Can you add DPF off and EGR off to the Bosch ECU file?
Yes, on request, for off-road and competition use: DPF off, EGR off, AdBlue (SCR) off, DTC off and speed limiter (Vmax) off. Upload a read through our file service and an engineer builds it (any file £50, from £30 in packs). The buyer is responsible for using it where the law allows.
What exactly is in the download?
A BIN file of 512 KB, ready to write. Write it with the same tool and the same connection you read the ECU with.
Does software 391821 fit other cars?
We also sell this software for the Audi Q7 4.2 TDI. The hardware number on your ECU decides whether the same file fits: match it before you write.
How do I get the file after paying?
It is in your account as an instant download straight after payment by card, Apple Pay or Google Pay: the BIN file, ready to write.
What if the file does not fit my car?
Send us your read and we correct it free, as many times as it takes. Questions before you buy are answered by a tuner on WhatsApp.
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