1996 Cadillac DeVille P0171 and P0174

1996 Cadillac DeVille

Cadillac DeVille On the 1996 Cadillac DeVille, when P0171 and P0174 are set with oxygen sensor codes, more times than not, this is not an oxygen sensor problem. This means the air-fuel mixture is running “lean” and this is what sets the oxygen sensor code. It’s not very common for both upstream oxygen sensors to fail at the same time. So, before condemning the oxygen sensors – First- check the Fuel Filter. Remove the filter and try to blow through it. Any resistance and the Fuel Filter will need to…

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1997 Cadillac Deville Ignition Control

1997 Cadillac Deville

Cadillac Deville On the 1997 Cadillac Deville, 4.6L engine, the P1350 is a fairly straight forward code that is pointing to a problem with the Ignition Control Module (ICM). You can fine the ICM located under the ignition coils (the flat metal piece that the coils sit atop – see image below). Carefully inspect the electrical connector and wire harness for any loose, broken or damaged wires. If the visual inspection checks ok, replacing the ICM should solve the problem. Does your vehicle have a similar problem? Get connected to…

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