ecu tuner

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    P0420 P0430- troubleshooting.

    Hello everyone. I've been fighting the dreaded P0420 P0430 on my newly acquired 07 GX470 with 190k miles. I've been searching for days-hoping I can find it's not cats since it's running very well; getting great mileage (18.4 avg on last tank with a light foot in CO) with plenty of power. I've...
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