RS4 Door Handle Sensors Failed: Keyless Entry Dead

Had a similar door locking system issue on my 2018 RS5 last winter. With some experience working on these cars, I can tell you the wiring fault was traced to a faulty door switch connection in the handle mechanism. The electric door sensors completely stopped responding just like yours. After proper diagnosis, it turned out the cable connection between the door handle sensor and the main locking system module had deteriorated. The workshop found a worn plug connection that was causing intermittent signal failures. The repair cost me 95 Euro including labor and parts. They had to partially disassemble the door panel to access and replace the affected wiring harness connector. Before suggesting specific fixes, could you share: Have you noticed any correlation with weather conditions? Does this happen on all doors or just one specific door? Are there any other electrical issues with the doors (windows, mirrors)? What specific error codes showed up in your scan? This information would help identify if your issue matches the common door mechanism failures I've seen discussed in owner forums.

Last service was completed at 92218 KM with all maintenance items up to date. The door sensor issue seems more severe than described in your case. Both front door handles are now completely unresponsive, while rear doors work normally. The error scan pulled codes B138A and B139F related to door electronics on driver and passenger sides. All other door functions including windows and mirrors operate normally, suggesting the issue is isolated to the handle sensor system. Temperature changes dont seem to affect the malfunction. The complete failure on both front doors simultaneously makes me suspect a control module rather than individual door switch wiring. The 95 Euro repair cost sounds promising compared to the 800 Euro quote I received. Will have them check the door handle connections first before replacing more expensive components.

After seeing your detailed follow-up, I suspect your issue is different from my door handle electronics fault. Having both front doors fail simultaneously does point more toward a control module problem rather than the wiring fault I experienced in my door mechanism. The error codes you mention typically indicate a communication failure between the door handle sensors and the central locking control unit. While my repair was a simple wiring connection fix, your symptoms suggest the control module might need replacement. The 800 Euro quote makes more sense now, as control module replacement requires programming and coding. My 95 Euro repair was just for resolving the loose connection in the door handle wiring harness. Before proceeding with the expensive module replacement, request they check: 1. The power supply to the front door control modules 2. The wiring connection between both front door handles 3. The central locking control unit connections Since your rear electric door handles still function, the fault is likely isolated to the front door system circuit or the module itself. In my case, the single door handle failure was a clear sign of a localized wiring issue, but your dual failure pattern suggests a different root cause.

I appreciate the detailed troubleshooting suggestions. Your previous issue does seem quite different from what I'm experiencing, especially given the simultaneous failure of both front door actuators. The fact that your fault was isolated to a single door handle wiring connection while mine affects both front doors simultaneously definitely points to a different root cause. The diagnostic steps you outlined make sense. I'll have them verify all power and ground connections to the front door electronics before replacing the control module. The door switch and handle sensor diagnostics should help narrow down whether its truly a module failure or perhaps a shared wiring issue affecting both front doors. Really helpful to understand the cost difference between a simple door handle wiring repair versus full module replacement. At least the 800 Euro quote seems more justified now knowing programming is required for the new module. Will report back once the repair shop completes their diagnosis of the door electronics system. Thanks for sharing your repair experience, having this context helps me better understand what to expect during the diagnostic process and confirms I should focus on the control module rather than individual door mechanism failures.