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If you have a search through old posts there's a bit of info. Light staying on would indicate it's a nats issue. If it was a 4.2 I could help you more but..
I've read the nats is managed by the ecu in the 3.0 so you'll probably need to find the issue. Tried the spare key? I also read in one of the old posts that it's normally an issue with the sensor ring in the ignition that picks up the signal from the key.
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