2006 STS V8 PCM LOCATION - 2006 Cadillac STS

Is this a V8 or V8 If it is a V6 it has one, if it is V8 it has 2, the other sensors are for the monitoring of the catalytic converter efficiency. If I had the code and exact engine I could be of more help.

Nicole, I google it and the 06 Cadillac STS does appear to have a ignition relay. It will most likely be found in the engine compartment fuse/relay box. Check the attached links,instruction and guides, Good luck
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http://www.rockauto.com/en/catalog/cadillac,2006,sts,4.6l+v8,1432044,electrical-switch+&+relay,ignition+relay,3480
2006 Cadillac STS ignition relay Google Search

Here is the sensor location on the 2005 STS. My understanding is that on the 2005 it sat over the exhaust cam sprocket and on the 2006 it sits over the intake cam sprocket. That should be no problem as there will only be one to locate.

The fuse is located under the rear seat in the fuse box.Trunk/valet fuse.

O2 sensor has detected a lean condition vacuum leak

Im havung trouble finding the fuse box to change out my fuse for the cigarette liter

On this website you find information (diagram, description and location) about fuse boxes in Cadillac STS mk1 (First Generation; 2005 - 2006)

Cadillac STS mk1 First Generation 2005 2006 fuse box diagram Auto Genius

If Equipt, The Fuel Filter Will Be Located On The Passenger Side Rear Of The Vehicle Above The Right Rear Suspension Bracket. It Will Be In Front Of The Wheel Above A Large Plate.

one under the hood one on the drivers side of the dash