SOURCE: after changing the oil on
I had a 2000 Focus ZX3 and Mine did the same thing. All I had to do is tighten the oil filter down pretty tight and It went away. Hopefully you get the same result.
SOURCE: low oil warning light staying on oil level ok
would be best to have oil pressure checked with a mechanical gauge to be sure you have oil pressure.
hopefully you just have a bad oil pressure switch this is located on oil filter adapter rt above filter
SOURCE: flickering oil light
This could be two unassociated problems; the flickering oil light can indicate that the pressure sensor for the idiot light is failing- this is not uncommon, the other can be a failed temperature sensor sensor on the main radiator.
The low oil pressure condition may also be indicative of a worn engine part or parts.
It would make sense to have the actual oil pressure checked in a shop to see if it is in the normal range which should lay between ~30 & 60 pounds depending on engine RPMs and engine temperature.
The idiot lights trigger at around 4-5 pounds and this is really pretty late for a warning; if the pressure is actually that low, not only lubrication is too little but the cooling effect of the circulating oil is inadequate.
If it was my car, I would replace both sensors before getting too worried.
The cost of these together (parts only) should be well under $50 US.
SOURCE: Oil light flickers on at idle and when stopping.
First thing to do is check for wires that may be chaffed against a valve cover, etc. Then, if that is not the case, replace the sender. If this continues, it may be the oil pump, and as long as you have the pan off and are getting greasy, pop off a rod cap and a main cap and inspect them for wear. Bad bearings can lower the oil pressure. OH! And as long as you ar in there, check the oil pick up tube for obstructions (sludge, plastic from the timing chain tensioners, if they are nylon, etc.) The mains may be starved for oil if they are blocked or restricted.
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