2004 Cadillac DeVille Q&A

2004 Cadillac DeVille Question: can you should me were on the car are the oxgyen senors all 4 I don't know where

can I get a picture of where they are -
Answer 1
why are you replacing them?? the chances of all 4 failing at the same time is like you getting hit by lightning in your living room. what is the issue?? Roy -
Comment 1
or could it be the mass air flow senor -
Comment 2
ok, same question, what is the issue??? Roy -
Comment 3
service engine soon light stays on -
Comment 4
what is the code?? Roy -
Comment 5
po171 and po174 -
Comment 6
Those codes tell you the sensors are working . diagnose the CAUSE before replacing parts . -
Answer 2
if the service engine light is on have it scan tested for codes -