| If so, what year ECU are you using? There is a boost pressure sensor that came on all TT's, and it is located next to your brake master cylinder on the DS fender area (not on the firewall itself). This is for the factory TT boost gauge and will not throw a code if faulty. 1995+ TT's also had a boost pressure sensor for the ECU, and I believe it is located near the front of the engine bay under the nose panel. If this is missing or faulty it will throw a code. I'm thinking you may have the wrong ECU...
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