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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!

Vehicle: 2000 Cadilac Deville DHS

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Since these are lean codes that are affecting both banks, you need to check for things that are a factor on the banks. Start with fuel pressure, vacuum leaks after the maf sensor. It is not likely an issue iwith the Os sensors as it would indicate both upstream sensors failed at the same time. This is very unlikely. I would start with fuel pressure as a possible cause.

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