Hellen 121 VAG¶

Status: abandoned legacy open source design

Hellen Plug-and-Play for ME7 VAG vehicles

💲Gets yours at rusEFI Store💲

Download release firmware Snapshot firmware bundle

⏩ Interactive Pinout ⏪

Schematics rev a

Schematics rev b iBom rev b

Schematics rev c

KiCAD source files

Hardware features¶

Electronic Throttle Body
knock detection module with headphone jack
built-in WBO - WARNING 4.2 software is not ready but we believe that the hardware is universal
Baro sensor LPS25HB (footprint, not populated)

Vehicle Specific Jumpers¶

Main Relay option Never have both R2 and R3 jumpers populated!

Voltage Input option Never have both R8 and R9 jumpers populated!

Raw +12 option Never have both F1 and F2 jumpers populated!

Vehicle	R2	R3	R8	R9	F1	F2
2000 Early Audi A4 1.8T (ME7.1, NBO2, NO VVT, DBW)	✔	✘	✘	✔	✘	✔
2001 Audi A4 1.8T (ME7.5, WBO2, VVT, DBW)	✔	✘	✘	✔	✘	✔
2002 Audi Allroad 2.7t apb	✘	✘	✘	✔	✔	✘
2006 Jetta 2.5 BGQ	✘	✔	✘	✔	✔	✘
2003 Audi A6 3.0	✘	✔	✘	✔	?	?
2003 Audi A6 4.2	✘	✔	✔	✘	✔	✘
2001 VR6 12V AFP	✘	✘	✘	✔	✔	✘
2002 VR6 24V BDF	✘	✔	✘	✔	✔	✘
2004 Cayenne 3.2	✘	✔	✔	✘	✔	✘
Other model	?	?	?	?	?	?

Connector Pinout Spreadsheet, with links to wiring drawings

[VAG-B5]

[VAG-C5]

Q: what cars is the 121vag applicable for?¶

A: We do not know the whole list. Definitely B5 1.8T Passat but could also work on 5 cylinder Jetta and VR6 and even a 8 cylinder A8. Whatever VAG product with a 121 header please check Hellen pinout above and let us know :)