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International Automotive Technicians Network
Re: 02 Outback P0420
Posted to Technical Theory Forum on 5/12/2004

Got this one back early this morning. Customer had tried to run the drive cycles himself & failed but no codes were stored. I hooked up the scanner & took it for a drive. STFT started going negative, at about -19 the ltft took over & eventually went to about -... Login to read more.