The exhaust flex pipe can fail causing excessive exhaust noise from the front/center area of the vehicle. The flex pipe is a flexible joint in the exhaust that allows for engine movement.
Resources for the Repair and Maintenance of your 2006 Saab 9-5
2006 Saab 9-5
2006 Saab 9-5 Problems
The direct ignition cassette can fail causing the engine to die while driving, and/or it will crank but not start. The engine may also have a rough idle and run roughly. Diagnosis may discover trouble codes for random misfires.
If the HID head lights are flickering or have failed, it may be caused by the window washer fluid leaking onto the HID modules. The washer fluid check valve for the head light washers develops the leak and drips onto the modules mounted under the head light assemblies.
The idler pulley for the serpentine belt can fail causing noise from the belt area. Our technicians report the pulley has been known to fail completely which can cause the belt to break or be thrown off.
If the engine will crank but not start, it may be the fuel pump has failed. Diagnosis may find no fuel pressure when attempting to start the engine.
2006 Saab 9-5 Recalls (Recent)
Summary: SAAB IS RECALLING 57,389 MY 2002-2008 9-5 SERIES VEHICLES FOR FAILING TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 201, "OCCUPANT PROTECTION IN INTERIOR IMPACT." DURING COMPLIANCE TESTING, ONE OF THE UPPER INTERIOR OCCUPANT PROTECTION TEST POINTS EXCEEDED THE STANDARD'S REQUIREMENTS.Learn more »
2006 Saab 9-5 Questions and Answers
It doesn't happen at slow speeds just in 4th and 5th gear and when I take my foot off the accelerator it still continues and even goes faster.
I suspect either the direct ignition cassette or the crank sensor