nobleone Posted June 21, 2007 Share Posted June 21, 2007 1992 sc400 41,000 miles drove it back from florida to wis.speedo reading is off its reads 40 mph you are going 57mph.20 mph is 36mph.this was this the whole time. now the other problem.the trac off light and the check engine light will come on the same time.and go off the same time. any one got any ideas. thanks.it runs perfect other than that. Quote Link to comment Share on other sites More sharing options...
soarer300 Posted June 22, 2007 Share Posted June 22, 2007 1992 sc400 41,000 miles drove it back from florida to wis.speedo reading is off its reads 40 mph you are going 57mph.20 mph is 36mph.this was this the whole time. now the other problem.the trac off light and the check engine light will come on the same time.and go off the same time. any one got any ideas. thanks.it runs perfect other than that. could be a sensor or fuse. Quote Link to comment Share on other sites More sharing options...
sc300max Posted June 25, 2007 Share Posted June 25, 2007 Yea could be a Vehicle Speed Sensor. Quote Link to comment Share on other sites More sharing options...
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