Where is the starter on a 1986 oldsmobile regency 98 located?

no diagram ,sorry , but usually located in the fuse/relay box in the engine compartment and the cover will have list of which is which

There are only 2 bolts. They go straight up through the starter motor housing into the engine block. You may have some plastic covers that go around the starter and flywheel area that will need to be removed to get to them.

Well, for starters, your problem got posted under 1985 Oldsmobile 98 - then you said it was a 95 Oldsmobile 98 Regency Elite (HUGE difference between 85 and 95)...then it would be REALLY nice to know which engine we are talking about.

I'll just go with what you said last: 1995 Oldsmobile Regency Elite (Two engine possibilities)

If you have the 3.8L Supercharged engine (VIN CODE "1") it is on the left side of the engine near the oil filter.

If you have the non-supercharged 3.8L (VIN CODE "K") there are TWO of them. One is near the oil filter and the other one is in about the same location on the other side of the engine block.

Please also note that MOST fault codes for knock sensors are not caused by the knock sensors themselves. (they do fail, but it is very rare.) Usually there is either a wiring problem to the knock sensor, or the engine has internal problems causing a "knocking" or "ticking" noise which causes the engine computer to "think" that there is a problem with pre-detonation causing an "ignition ping". The code sets when the computer has retarded the ignition timing as far as it can and the "knock" or "ping" does not go away....usually it doesn't go away because it is not caused by ignition timing. The knock sensor is just doing its job and reporting the knock. It does not know the difference between a knock caused by ignition and a knock caused by internal engine problems.

Look at the side of the engine block above the oil pan just in front of fire wall.

it is located in front of engine down toward the bottom of engine

1986 Oldsmobile 3.8 liter V-6

The starter motor for your Oldsmobile is mounted at the front lower part of the engine, just behind the radiator.
Book time to replace by an experience person is 1.1 hours.
If you are looking to do this yourself, disconnect the battery negative terminal and isolate it.
Remove any covers or braces in order to access and remove the starter.
Remove the wires to the solenoid on the starter, then the bolts retaining the starter to the engine.
There may be some shims between the starter and the engine. You may need to replace these with the new starter.
Hope your repair goes well.

KL

steering wheel puller

my fuel filter is located right behind the pass side tire on the inner side of the frame.

have the wire replaced by a certified mechanic with oem replacement parts