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Registered
2001 Cadillac Eldorado ESC
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22 Posts
Discussion Starter · #1 ·
need more indepth info on these codes: P0171, P0174,( i know these are lean bank codes, but what do they mean)
 

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Super Moderator
2010 DTS
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88,474 Posts
They mean you have a vacuum leak. On the 2000+ engines the most likely place is a rip in the plenum. That is the rubber coupler between the TB and the manifold. The rip is usually on the underside so it will not be visible. Spray some Brakleen around it and listen for an RPM increase.
 
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