Good to see the factory have leapt on this and are being supportive.
Is there another 3.7 owner in NZ? I'm wondering if you could swap ECU's (they're easy to swap out). Having said that, I doubt the ECU would suddenly start misbehaving.
Do you have an OBD II scanner? Or have you looked up the fault codes?
A scanner is not expensive, might be worth getting one - clearing this code and seeing if develops again.
Can you pull a plug and take a look at its condition?
Could it be an oxygen sensor? Would that cause a lean code?
Do you drive at altitude?
Sorry - I'm just firing thoughts at you.
