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Grab the WIS over in the Tech2 section on saabcentral.
https://i.imgur.com/exfoBjK.jpg
https://i.imgur.com/exfoBjK.jpg

Can you open the door from the outside or is it completely stuck?
All the door mechanics are the same regardless of position...the links show you how to disassemble a door and how the mechanisms...

This may help...........
https://www.saabcentral.com/search/115098/?q=door%2Bhandle&t=post&c

https://www.saabcentral.com/threads/08-door-handle-removal.720990/#post-6357642

Also...

Off course you can use any other wheels that fit!
There are also plenty of aftermarket wheels!
For the 07 9-3 they have to have the same PCD ie 5 x 110 and offset ET41 and centre bore 65.1mm...

Wait until you have the results of the testing.
After that its probably worth a try before further work...at 260K and a 98 any repair is likely to be the value of the car unfortunately.

Unless the car has overheated then less likely to be the HG..although 1998 and high miles maybe?
Test for combustion products in coolant...any sign of oil in coolant?(kits on Ebay)...

Do you get any messages on the SID?
"Key not accepted" ?

Give us more detail...does the dash light up/is the battery good etc

Certainly unlucky as the power steering pump electronic or belt driven are not common failures.
Do you have the EHPS or the belt driven version?
Suggest trying a suitable Saab independant...

You will very likely have broken wires in the conduit that runs on the left side of the boot.
It stresses and flexes when you open close the boot and wires are a bit short.
If you open the boot you...

Well you need the fault codes to start troubleshooting........car probably in limp mode.
Often the solenoids start sticking.
"on for a while" with the fault has probably made things worse and
has...

Have you got the gear wheel EML showing?

https://www.saabits.com/all/classic-saab-900-door-window-weather-strip

Much easier with suitable puller tool.......done the job myself on an Astra which is similar and its very hard to get the bush in without one...doesnt matter if you destroy the old one getting it...

And the car is?

As you have likely found out the full set of misfire codes is a symptom of a bad ECU.
Are the coils genuine?
The first two P0646 and P1682 indicate an aircon problem which is probably a seperate...

Thats part of the crankcase ventilation system (feeds into a catch can at the back of the engine block).
Easy enough to swap part I think is 55351569
https://i.imgur.com/oJMg69d.jpg

Just...

Ask what work has been done...at that mileage apart from suspension components and brakes virtually all the major stuff may have been replaced.
If its been well maintained I wouldnt worry too much...

This should help
https://www.youtube.com/watch?v=ehalLlNiQqU
and
https://www.youtube.com/watch?v=mhOVaju1Svs

Also a quick check is to lift up the big black pipe that runs to the throttle body...

You dont tell us which car/engine combo but its likely the turbine shaft is moving around a bit and you can hear it whining under load/boost.
Disconnect the pipe running to the intake throttle body...

Its true the diesels have EHPS but I am suprised there would be a noticeable difference versus mechanical pump.
We have 5 Saabs in the family a mix of 9-3's and 9-5's and frankly I have never...

The tic tic tic is the throttle body going into limp mode....and putting the engine in the same state.
Disconnect your battery to clear the code otherwise...tic tic tic straight away
Then reset the...

You have probably found it by now.....but...
https://i.imgur.com/8SE2w4q.jpg

Have you probed the wiring back from the connector to establish a break or corrosion (high resistance) problem.
I usually do this type of thing sticking a tiny pin in the wire at various points back...

https://www.ebay.co.uk/itm/Saab-9-3-93-Gear-Turret-Repair-Kit-Sport-55556311-6-Speed-Gearbox-Fix-Fault/254248976413?hash=item3b326b801d:g:xGwAAOSwvmtc8GWy

Opcom is useful but only for the Z19 engines I doubt if you can make those changes........you can code injectors and force regens and get all the engine read backs
So useful for those things alone....