SEAT · MED17.5.20 ECU · petrol

SEAT LEON MED17.5.20 tuning files

SEAT LEON on the MED17.5.20: matched, calibrated and delivered with care. The matched variants sit between 122 and 125 HP from the factory. It is a petrol platform, tuned for response and clean power delivery. Each file is tied to the precise software on your car and checked before it goes out.

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Available solutions

Solutions that apply to the MED17.5.20 on this petrol platform. The exact set depends on the specific engine and software version.

Stage 1 Stage 2 Swirl Flaps OffLambda / O2OPF/GPF Off

Engine variants & ECU software

8 distinct variants for the SEAT LEON on the MED17.5.20 ECU. Reference the engine and controller software when you upload.

Variant 1

ECU

Catalog engine: 1400 125HP
Engine code: CAXC
Controller brand: BOSCH
ECU: MED17.5.20
Stock power: 125 HP
ECU SW: 0261201787
ECU HW: 0261201787
SW upgrade: 03C906022B_1960
Calibration: 03C906022B_1960

Variant 2

ECU

Catalog engine: 1400 125HP
Engine code: CAXC
Controller brand: BOSCH
ECU: MED17.5.20
Stock power: 125 HP
ECU SW: 6660
ECU HW: 03C906022AQ
SW upgrade: 03C906022AQ_6660
Calibration: 03C906022AQ_6660

Variant 3

ECU

Catalog engine: 1400 125HP
Engine code: CAXC
Controller brand: BOSCH
ECU: MED17.5.20
Stock power: 125 HP
ECU SW: 1037515772
ECU HW: 0261S04396
SW upgrade: 03C906022AQ_8658
Calibration: 03C906022AQ_8658

Variant 4

ECU

Catalog engine: 1400 125HP
Engine code: CAXA
Controller brand: BOSCH
ECU: MED17.5.20
Stock power: 125 HP
ECU SW: 5939
ECU HW: 03C906022H
SW upgrade: 03C906022H_5939
Calibration: 03C906022H_5939

Variant 5

ECU

Catalog engine: 1400 125HP
Engine code: CAXC
Controller brand: BOSCH
ECU: MED17.5.20
Stock power: 125 HP
SW upgrade: 03C906022AQ_3641
Calibration: 03C906022AQ_3641

Variant 6

ECU

Catalog engine: 1400 125HP
Engine code: CAXA
Controller brand: BOSCH
ECU: MED17.5.20
Stock power: 125 HP
ECU SW: 5937
ECU HW: 03C906022AJ
SW upgrade: 03C906022AJ_5937
Calibration: 03C906022AJ_5937

Variant 7

ECU

Catalog engine: 1400 125HP
Engine code: CAXC
Controller brand: BOSCH
ECU: MED17.5.20
Stock power: 125 HP
SW upgrade: 03C906022B_6659
Calibration: 03C906022B_6659

Variant 8

ECU

Catalog engine: 1400 122HP
Engine code: CAXC
Generation: 5F Mk1 2012-2017
Matched gains engine: 1.4TSI (CMBA-CXSA) 122
Controller brand: BOSCH
ECU: MED17.5.20
Stock power: 122 HP
Stage 1 power: 155 HP
Power increase: +33 HP (+27%)
Stock torque: 200 Nm
Stage 1 torque: 270 Nm
Torque increase: +70 Nm (+35%)
SW upgrade: 03C906022AQ_2734
Calibration: 03C906022AQ_2734

Related vehicles

Other vehicles built on the MED17.5.20 controller or the same engine — handy when a platform spans several models and makes.

Questions, answered.

Which tuning solutions are available for the SEAT LEON on the MED17.5.20?

Stage 1, Stage 2, Swirl Flaps Off, Lambda / O2, OPF/GPF Off. The exact set depends on the specific engine and software version.

Do you cover the MED17.5.20 ECU software on this model?

Yes — the SEAT LEON on the MED17.5.20 ECU is part of the catalog. Upload your original file and it is matched to the right calibration before any work is done.

How is the file delivered?

Through the TuningBay workflow with operator validation and one safe, sensible result per job. Files we deliver, we stand behind.