1999 saab 9-5 check engine light is on

Take it back to Saab shop, have the put it on the lift and loosen the fuel tank drain plug a crack. Water will always lay on the bottom and it can be drained off from the plug on bottom. Otherwise, you have to have a syphon unit in system originally that pulls the water off the bottom. The latter is most likely. Just resetting the light out isn't removing the water. Makes sense Huh? Thing is, someone just isn't doing their job at Saab.

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You will need to have your car's ECM (Computer) read by a OBD II scanner to determine what Trouble Code your ECM is giving so a mechanic can properly diagnose the problem. You can go to your local AutoZone store and they can pull the codes out of your ECM for no charge.

Water on any electrical part of the engine can cause problems. Even high humidity. The only parts you can easily check and dry out is the plug wires where they connect to the coils and any connections you can find where components are plugged into wiring a harness.

Have it scanned at your local garage.

Had same problem last week, just fixed by local Saab Centre. They replace the CKP Sensor and problem gone.

87 octane ,,,you kidding ---more like 95 octane .But this has nothing to do with the vibration and check engine light,forget having the codes read get the dealer to look at it

Take your car to the dealer, local garage, auto parts store and get them to pull the code which should tell you exactly what the problem is. I would also check the transmission again and make sure it isn't leaking and is at the correct level. If the problem was low transmission fluid you still need to have the code "cleared" before the car will return to normal. Hope this helps.

If you have an automatic transmission and notice that the engine bogs down as you slow, the tranny may need adjustment as it sounds like it isn't releasing as it should as you stop. 

It sound like you are having a electrical problem.You need to check your electrical/ignition system,not all electrical problem the diagnostic machine can read.