Idling problem i have a 96 saab 900s there are two codes 1124 and 1128 what are they . are they related two each other

hi see the link

Saab Workshop Manuals

Look for a fan belt routing sticker near the radiator support or under the hood.

When you start the car the display should ask you for the code....Code In.....you should be able to simply enter the code and the radio should come back on. If 'Code In' does not display when you turn on the radio press and hold the 'band' button and 'code in' should come up on the screen.....let me know if that helps....if not I will go out and re-do mine on my 1997 Saab 900S to double check.....good luck

could be EGR, Idle air control valve, is it running rough when driving or is there any white smoke out the tailpipe

my 1995 saab 900s actually has the code written on the casing of the radio once you pull it out

no.
sid cna be changed when ever.. radio code can be retrieve by dealer for free just call... you will need to take out the radio it self to see the PUI number

I have a 96' Saab Turbo SE Convertible. My code is 3146. Try it to see if it works.

I'm afraid if you don't have the code, you will have to take it to a local dealer or specialist radio store to have it re-coded.

Fortunately, it's not expensive.

P1128 on Motronic (1996 900 S) indicates multiplicative adaptation fault > 22%. Symptoms are poor driveability, hunting idle speed, possibly in combination with other DTCs (e.g. low fuel level, MAF (mass air flow sensor just behind the intake filter), misfiring).
WIS instructs one to 1st check wiring harnesses and connectors for places where shorts may have developed. Visual inspection results should be verified with multimeter. Check all air hoses and vac lines for leaks. Also check the throttle body o-ring which is a known problem. Check the evap purge cannister. Finally, electrically test the MAF.

Here is an illustrated tutorial for the 2.0 liter turbo. It is essentially the same for the naturally aspirated 900S: http://bellsouthpwp.net/m/a/mattiaso/WebPages/Auto/therm.htm