Ecu and key chip

[nate1981]

do you have to have a key chip for the ecu to work?
I am thinking of changing an engine from 1.4 to 2.0 will the original chip and transponder work with the 2.0 ecu
Thanks

 

[Hally]

No, you need the keychip and NATS IMMU box from the same car as the ECU.

The IMMU box is a black Siemens box under the dash near the steering wheel.

All three need to match.