Hello I need help so I have 2000 Ford Mustang my right turn Signal is on and my car starts to shut off operating temperature but it’s OK cold start or when I turn on the a/c it turn off too I have a code

P1414 FORD - Secondary Air Injection System Monitor Circuit High Voltage it’s that the reason my car keeps shutting off???

 

No, that's not the reason. That code the car will just complain about but won't shut the motor down. It's either a hose has worked itself loose or the solenoid is bad or other wiring issue, or the air pump is no good (although I can't remember if that car has an air pump... not all that brushed up on that car.)

Also, v6 or V8? Might be important.

With the other items (turn signal, shutting off randomly-ish, a/c on=engine off) it sounds like there's something seriously messed up electrically speaking. You're not going to find the answer here, although we certainly are up to throw all kinds of darts and such at the maybes that're present. You're going to have to get an electrical diagram, a multimeter, maybe a power probe, maybe a high and low watt testing light, a whole lot of time, and a diagnostic chart for your model/year Mustang, and get to diagnosing things.

My *guess* is ignition cylinder, or chewed up wiring somewhere that a rodent really liked to hang out, or maybe a bad ground somewhere. From *WAAAY* over here, of course, and that's no good for guessin'.

Here's the quick test: Look at all the wiring in general. Under dash and in the engine bay, top to bottom. Check all connectors and any bolted down wiring (mostly grounds, but even the alternator has that kind.) If it looks wrong, it probably is, and you should inspect closer. If it's loose, there's probably the issue. They don't always show themselves, though, in tape and looms, so that's why you need the tools to diagnose it up there if it's not obvious in some way.

If you're not inclined, or have the knowledge, to do these things, then I'd highly recommend a good mechanic with known good electrical diagnosis capabilities and tools. You can either pull your hair out, make things worse, spend a WHOLE lot of time and/or money on chasing and throwing things at it, or maybe you spend the money with the guy who does this job.

Figured I'd throw some examples for ya out there: My motorcycle once went *stupid*, gauges wonky, wouldn't start, all kinds of weird. She's elderly, but still. Wound up being the main chassis ground bolt had worked loose. And the rings were a little tarnished/rusty from that. Fixed that, tada. Second thing on that motorcycle, turn signals and horn quit working on the way home from a road trip. Dangit. Not a huge, just used my trusty old school turn signal, aka my left arm. Up for right, out for left, down for stop. Got home, and broke out the tools, wiring diagrams and diagnostics for the bike and went to work... and it was just a very slightly crusty/weak connector situation on the relays for those two. Cleaned them up (and then proceeded to clean the rest of them everywhere, just in case) and dielectric grease on 'em, and she's been good since.

All suggestions are, well, suggestions of course, and may or may not work for you, but I hope some of it does. I wish you luck, hope it helps, and welcome you to the forums!