We have just replaced the air flow sencor! We think it may be the oxygen sencor but not sure if it is the up or down air flow sencor. We have rebulit the transmission and replaced the coil pack! There was a misfire on the number 8 cyclender! Replaced all spark plugs! Had more code got them off the light came back on with new codes! On Cadilac Deville DHS 2000 Codes are PO171 & PO174 Thank you!
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