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Audi A3 8v 1.8tfsi gearbox issues


Law6on
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Hi all, new to this so give me a chance... 
 
Just brought a 2014 Audi A3 1.8TFSI. It’s got 57k miles on it and is cat n. It’s also running big power - bigger turbo intercooler turbo back exhaust etc etc (360bhp ((180bhp standard)) ) Found out that the gearbox has been replaced with a 7 speed 2016 gearbox code RRF (car should have PYV). According to TPS either box is fine for the car but apparently the mechatronics is not meant for the car (Need to get part number and code for this) The gear box fitted has a sensor zip tied to it which is the gearbox speed sensor. They have done this as the gearbox has no cutout for the sensor to be placed in... I have no warning lights on the dash but a lot of fault codes come up when it’s plugged in (will post codes below) and when driving normally the gearbox is fine however when you put your foot down it often won’t change gear, usually revs to around 4k and then it’s as if you are hitting a rev limiter it just won’t shift up until you completely let off. Then when you put your foot down again it will rev out shift up and then tend to do the same in the next gear however strangely sometimes it shifts with no issues at all. My garage is telling me to change the mechatronics unit to correct one however the part alone is £1400 and I didn’t even bother to ask for a labour quote. I have no idea what the best way of going about this is or how to fix the issue hence coming here for advice. I was wondering if maybe there is a way of mapping the sensor out as if they make the gearbox without the sensor hole they must run fine without one? 

Any advice or pointers in the right direction is massively appreciated! Fault codes to follow most relevant ones being at the bottom G240 and G28 sensors 
 
DETAILED ECU INFO
 
 
CAN network gateway
 
Part #: 5Q0907530Q
 
Component: GW MQB High 
 
Coding: 030100042F085A005B0002481C0B00000001000000000000000000000000 (hex)
 
Fault codes:
 
197175 Manufacturer-specific code
 
 
Central electronics
 
Part #: 5Q0937084AH
 
Component: BCM MQBAB M+ 
 
Coding: 07051C42C25106FD038C5004B31407A80800000000000000000000000000 (hex)
 
Fault codes:
 
526359 Manufacturer-specific code
 
 
Steering wheel
 
Part #: 8V0953521CH
 
Component: Lenks. Modul 
 
Coding: A418 (hex)
 
[No fault codes]
 
 
Parking/steering assist
 
Part #: 5Q0919283B
 
Component: PARKHILFE 4K 
 
Coding: 0000050011 (hex)
 
[No fault codes]
 
 
Airbags
 
Part #: 5Q0959655N
 
Component: AirbagVW20 
 
Coding: 98CCC0000C0000005C5400CA00C800000065 (hex)
 
[No fault codes]
 
 
Instrument cluster
 
Part #: 8V0920970M
 
Component: KOMBI 
 
Coding: 27AD0918228026000100FA00100000 (hex)
 
Fault codes:
 
13636608 Manufacturer-specific code
 
 
ABS
 
Part #: 5Q0907379AA
 
Component: ESC 
 
Coding: 12F18AA234242A6F0178060641CC2948512C5480608294F4024100080608 (hex)
 
[No fault codes]
 
 
Power steering
 
Part #: 5Q0909144P
 
Component: EPS_MQB_ZFLS 
 
Coding: 8103 (hex)
 
[No fault codes]
 
 
Ignition authorization
 
Part #: 5Q0959435A
 
Component: VWKESSYMQB 
 
Coding: 030C0C (hex)
 
[No fault codes]
 
 
Steering column lock
 
Part #: 5Q0905861A
 
Component: ELV-MQBA 
 
Coding: 5D00000000000000 (hex)
 
[No fault codes]
 
 
Heater & air conditioning
 
Part #: 8V0820043C
 
Component: AC Automat 
 
Coding: 03100004000000011000000000001100 (hex)
 
[No fault codes]
 
 
Front passenger's door
 
Part #: 5Q0959592B
 
Component: TSG BFS 
 
Coding: 001086205E01040000001002 (hex)
 
[No fault codes]
 
 
Driver's door
 
Part #: 5Q0959593B
 
Component: TSG FS 
 
Coding: 00108E205C01040000001002 (hex)
 
[No fault codes]
 
 
Headlight aiming
 
Part #: 7P6907357C
 
Component: AFS-ECU 
 
Coding: 011E00002B230200 (hex)
 
[No fault codes]
 
 
Transmission
 
Part #: 0CW300046C
 
Component: GSG DQ200-MQB
 
Coding: 0014 (hex)
 
Fault codes:
 
10657 Manufacturer-specific code
 
 
Engine
 
Part #: 8V0906264B
 
Component: 1.8l R4 TFSI 
 
Coding: 0A2500322424010B3000 (hex)
 
Fault codes:
 
15377 Manufacturer-specific code
 
 
Infotainment system
 
Part #: 8V0035020C
 
Component: MU-H-ND-EU 
 
Coding: 01730301FF00000021111101000A00002F02010701000100DE (hex)
 
Fault codes:
 
01584 Vehicle too low, pump up started
 
01585 Contact switch lockcylinder front seat passenger side (F242), open
 
01586 Contact switch lockcylinder passenger side (F242). close
 
01587 Igniter 2 for Airbag; Drivers Side (N250)
 
01588 Igniter for Head-Airbag, Drivers Side (N251)
 
01589 Igniter for Head-Airbag, Passenger Side (N252)
 
01590 Igniter for interruption battery (N253)
 
01593 Heated Windshield (Z2)
 
01592 Air Quality Sensor (G238)
 
01595 Type pressure control button (E226)
 
01591 Warning lamp for Airbag out, Driversside (K144)
 
01605 Potentiometer 2 for gear recognition (G240)
 
00513 Engine Speed Sensor (G28)
 
 
Obtained with Carista 
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