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- - 2000 Deville 174/171 codes (https://www.cadillacforum.com/forum/cadillac-deville-15/2000-deville-174-171-codes-12122/)

garretthes

05-02-2011 01:53 PM

2000 Deville 174/171 codes

I have consistent 174 and 171 codes on my DHS. It has 198k. I sprayed carb cleaner all around the intake and plenum with NO change in rpm. What's next?

gmtechs

05-02-2011 08:21 PM

r your o2 sensors working
r there any engine noise in vehicle
did u check vacuum lines for cracks

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