Try the owner's manual or the manufacturer's website.
Check your owners manual to find the location of your fuses. There should be a diagram showing where each fuse is located.
A diagram showing where the knock sensor is can usually be found on the car's manufactor website. You can also find a diagram at your local auto parts store.
On the internet.
There are solar structure diagrams at the related links.
You will find all O2 sensors threaded into the exhaust system at various points.
You can find a diagram showing the engine wiring on a Fiat Bravo 1.6 HLX at wiring4cars. The website lets you search for diagrams by vehicle make and model.
Chromosomes are found in the nucleus.
where can you find a free diagram for putting a air conditioning belt on a 2001 Montero sport Mitsubishi?
Find the manufacturers information from the different vendors through NAPA or O'Reilly's. Then you can typically find the information via the web.
Get a manual on your car.
You will find them in the exhaust system.
Get yourself a Haynes repair manual for that car. It has a lot of good diagrams in it.