I was talking to him. Your advice is valid except a 21 is more often than not caused by insufficient current flow through the heater. It's even mentioned in the TSRM. Not that he used the book to check any portion of the sensor because, you know, RTFM is for pussies...
oneman: if you possess neither the tools or knowledge it'd be simpler to install a new alternator.
Jon: it may not be brushes. Could be a bad field connection at the slip ring or a loose stator connection. If it were me I'd tear it down. You'll need a rattle gun for the sheave nut.
Other...
Replacing the internal seal and bearing requires gear removal. Replacing the external O ring does not. I prefer to us a gasket in addition to the O ring. As long as you mark the sensor internally and don't turn the engine over while it's out you shouldn't have to time it again.
Have you push started the car recently? If so just clear the code. If it comes back you'll need to determine why there's not 10-12 volts on the ecu's STA terminal during cranking. The signal comes from the same wire that triggers the starter. Your other problem is unrelated.
It never ceases to amaze me why some people feel others on the internet can find a leak's source easier than those who're actually right there with the car.
Does sound like brushes. Good thing they're easy to change. Better do it before the slip rings get torn up.
Brings back memories. My car left me with it's original alternator. I replaced the brushes and bearings just once.
Well, if you got the plug you have now to seal the Fumoto should also but even if it doesn't you'll only have to fix it once. After that it's all gravy...
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