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i am lead to believe both will work fine there may be some slight diff in mapping due to different gear ratios and power outputs here is a list of what was fitted to each
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VW T4 TDI 2,5 ACV 074906018AL
VW T4 TDI 2,5 ACV 074906018BG
VW T4 TDI 2,5 ACV 074906018C
VW T4 TDI 2,5 ACV 074906018M
VW T4 TDI 2,5 ACV 074906021
VW T4 TDI 2,5 ACV 074906021A
VW T4 TDI 2,5 ACV 074906021F
VW T4 TDI 2,5 ACV 074906021L
VW T4 TDI 2,5 ACV 074906021N
VW T4 TDI 2,5 ACV 074906021S
VW T4 TDI 2,5 ACV 074906021T
VW T4 TDI 2,5 AHY 074906018AN
VW T4 TDI 2,5 AHY 074906018D
VW T4 TDI 2,5 AHY 074906018N
VW T4 TDI 2,5 AHY 074906021M
VW T4 TDI 2,5 AJT 074906018AK
VW T4 TDI 2,5 AJT 074906018B
VW T4 TDI 2,5 AJT 074906021S
VW T4 TDI 2,5 AUF 074906018AM
VW T4 TDI 2,5 AXG 074906018AJ
VW T4 TDI 2,5 AXG 074906018AN
VW T4 TDI 2,5 AXL 074906018AH
VW T4 TDI 2,5 AYC 074906018BH
 

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holy thread bump!

Can you fit any ECU from a 2.5 tdi to another 2.5 tdi so long as they have the same numerical part number i.e are all 074906018 ECUs interchangeable despite the letter at the end?
 
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