Which store is speclizing in car diagnostic tools and products in good quality?

You'll need a quality diagnostic scanner to check this out further, call your friends who are skilled technicians with good quality diagnostic tools and your oca parts stores to see if their scanners have the capabilities needed check your body control module, some do. Check all local used parts & savage yards, etc. as they may have one they'll sell you at a deal or let you pull it yourself. Start with the diagnostic scanner/tool route described above, toull find a reasonable way to get this handled, best of luck to you!

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Start with a proper diagnostic scan using a quality scan tool. Cheap scan tools may not communicate with the various modules in the vehicle and therefore will not display a code. Don't toss parts unnecessarily at the vehicle until you properly scan and retrieve the stored codes and then repair from there

Lol, really going to need a lot more info then that. I am assuming that you would not have the knowledge required to perform this safely. I would suggest professional installation.

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Hello, I know a very famous diagnostic tool supplier, its quality is good and the price is also the lowest. You can google Chinasinoy directly to go to their website. they will provide very professional service.

Hi.

All post 1995 models use a standard OBDII code reader.

Here the diagnostic device. All models listed below will work on any post 1996 Saab and can be purchased online.

US and global:

U380 OBDII Check Engine Auto Scanner Trouble Code Reader.

Autel MaxiScan MS300 CAN OBD-II Scan Tool

OBDII Code Reader LAU-CRE

UK

Diagnostic scanner can code reader obd2 eobd ii ms300

OBD II AutoScanner DTC Data Code Reader

U380 Obd 2 Ii Eobd Obd2 Fault Code Reader Scanner Uk

The only way to read the diagnostic trouble code stored in the onboard computer is with a diagnostic scan tool. Some parts stores such as Autozone will read the code for you for free.
Good Luck