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If it has nats he will need the ECU from the car he got the new barrel from. The chip in the key is mached with the ECU so if he now has a new barrel and key the ecu wont reconise the key and therefore wont disable the NATS. There is a quick fix for this....Tape the old key inside the ignition cowling next to the little chip on the back of the new barrel. This will allow the reader to pick up the correct key disarming the NATS still allowing the new barrel and key to start the car.....hope this helps