Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Hello. I have a 07 ford crown victoria police with 4.6 liter. I have a p0642 sensor ref voltage (a )circuit low fault. I watched some vids and cant afford the book(yet but will get). I'm needing to know pretty much everything. Start with what?. And if you suggest anything, like a wiring diagram can you give suggestions how to find 1. Thanks and this poor man on disability appreciates any help.
From one disabled person to another, I understand your situation.
Do you have any testing equipment, ie; multimeter, test light? If not other than checking for a blown fuse there is not much you can do yourself.
Free wiring diagrams are not something you will find and paying for one does no good unless you understand electrical systems.
Your problem could be from a blown fuse to a shorted sensor to wiring problems. I suspect your car is running poorly if even running at all as the 5v reference circuit is critical to engine performance.
I'll give you advice based on what equipment you have. Let me know.
"an open mind let's knowledge flow in and wisdom flow out for a man who has neither never listens to those who have both".
Being wrong doesn't bother me, it's being right and not understanding why that does
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