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1997 GMC C3500 codes PO340 , PO102 FIX
Posted to Technical Discussion Forum on 8/8/2005

Found that when transmission was fixed wires to O2 sensor connector was too close to exhaust creating melting of connector than shorting to exhaust. Was constantly blowing ENG1 20a fuse and above codes PO340 , PO102.

Ok now all codes cleared

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