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Q: My 2001 cadillac deville check engine light is on and the code is p0471?
on 2001 Cadillac DeVille

And my 2001 cadillac is leaking oil from the front why is that?
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The first step is understanding why the check engine light comes on. It is connected to the on-board computer and is only set when the on-board computer detects a fault in engine driveability or performance, transmission control system or transmission, or the emissions system, and a fault code is set and stored in the computer. Faults that can set the check engine light can range from a vaccuum leak, engine mis-fire, low engine compression, faulty sensor such as O2 sensor or other engine sensor, hydraulic pressure loss in transmission, transmission shift solenoid, open/short in wiring harness, emission evaporative system leak, or one of over 300 reasons. And not every fault that is set will have outward symptoms.
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