Audi S7 Start Failure, Switch vs Starter Mystery

Had similar issues with my Audi S5 2012. The symptoms matched exactly, intermittent starting problems and rough running. Initially thought it was the ignition switch too, but turned out to be a combination of issues. Main problem was a failing starter motor showing classic symptoms, turning the ignition key would sometimes result in clicking sounds or delayed engagement. The rough running and shutting off while driving was actually traced to a faulty crankshaft position sensor, not the ignition system. Key diagnostic steps revealed: No dashboard lights during starting attempts, Inconsistent power to starter motor, Multiple fuses checked fine, Battery connections were clean and tight, Starter motor drawing irregular current The starter motor replacement solved the starting issues completely. The crankshaft sensor was replaced at the same time since the car electronics were already being serviced. It was a serious repair that required partial removal of the intake manifold to access components. Worth checking these specific components before assuming its just the ignition switch. The symptoms can be misleading, and proper diagnosis with car electronics testing equipment is essential.

Thanks for sharing your experience. My situation seems very similar, especially the part about clicking sounds and delayed engagement of the starter motor. I ended up fixing the issue last month and it has been running perfectly since then. Would you mind sharing how much the repair cost in your case? Also curious if any other issues have popped up since the starter motor and crankshaft sensor replacement. My car is due for a general service soon and Id like to have them check these components again to prevent future problems with the car ignition system. Good call on mentioning the importance of proper diagnosis with testing equipment. The dashboard lights behavior was indeed a key indicator in my case too.

Actually, my case turned out differently. After getting a second opinion, it really was the ignition switch that needed fixing, along with a blown fuse in the ignition circuit. Total repair came to 52 Euro for parts and labor, much cheaper than I initially feared. The car electronics testing revealed the ignition switch was sending inconsistent signals, causing those starting problems. Once replaced, all symptoms disappeared completely. No dashboard light issues or starter motor problems since the repair six months ago. For your upcoming service, definitely have them check the whole ignition coil system even though your immediate problem is fixed. These components tend to wear gradually, and preventive checks can save bigger headaches later. The starter motor should also be tested during routine maintenance to catch any early warning signs. One tip I learned: keeping detailed service records of ignition system repairs helps track patterns and prevent repeat issues. Since my repair, the car starts perfectly every time with no clicking or hesitation.

After reading your experience, I decided to take my car to a different mechanic for diagnosis. Their testing equipment showed my starter motor had completely failed, not the ignition switch like the first mechanic claimed. The total repair came to 780 Euro including labor. The whole process took about 4 hours. They also found the battery terminals needed cleaning and tightening, which they did at no extra charge. The car starts perfectly now, no more clicking sounds or rough running issues. Since the repair three weeks ago, my dashboard lights work normally and the engine runs smoothly without any starting issues. The new mechanic suggested getting the ignition system checked during my next service, but so far everything works like new. Looking back, I should have gotten that second opinion sooner instead of trusting the first diagnosis. Proper testing equipment really made the difference in identifying the real problem.