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One For The Graphing Gurus.
Posted to Technical Discussion Forum on 2/24/2003 98 Replies

The subject vehicle here is a 97 T100. The complaint is MIL on again.

A pull of current codes showed P0420 catalyst efficiency code.

No exhaust leaks were present, freeze frame showed long term fuel trim at -5% the fuel trim at 75 mph cruise was -3%.

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