Welcome to the forum.
The problem may not be your car, it may be the person repairing your car.
When a modern car has an electrical or mechanical issue that triggers a fault code sometimes more than one code will appear. When that happens some mechanics, especially those with little experience or poor diagnostic training, will simply pick one fault code and replace the corresponding part. In reality, the problem lies with a different part that may have triggered a secondary code.
A mechanic with good diagnostic skills will examine parts "upstream" of the fault code to determine if they may have triggered it.
We have several members who have had dealers replace a handful of parts before finally getting to the problematic sensor.
2005 SL AWD, Platinum
-OEM HID conversion & HID fogs
-OEM iPod interface
-Upgraded (non-Bose) speakers - Pioneer TS-A1702C & TS-G1643R
-Muth signal mirrors
-Valley Industries hitch and wiring harness
-Aluminum fuel tank shields