Audi A3 Speedometer Glitch: System Readiness Fix Guide

Having dealt with a similar situation on my 2017 Audi A4, I might be able to share some useful insights based on some experience with diagnostic issues. The speedometer error messages can indeed be related to incomplete system readiness monitors. In my case, I connected an OBD2 scanner which revealed several pending codes. The drive cycle completion is essential for accurate system readiness status. Since you mentioned having diagnostic codes stored, could you share: Which specific error messages appear on your speedometer? Have you recently disconnected the battery? Are you using any specific OBD2 scanner to read the codes? For my A4, the solution was straightforward since I already had recent car diagnostics performed. The stored codes simply needed proper interpretation. No repair costs were involved as the issue was resolved through proper code reading and understanding the vehicle inspection requirements. Before scheduling a workshop visit, completing a proper drive cycle might help. This typically involves: Starting with a cold engine, Steady highway driving for 10-15 minutes, City driving with several stops, Maintaining various constant speeds This helps establish proper system readiness and could resolve your speedometer issues without additional repairs.

Thanks for the detailed response. My last service was at 145000km and the current odometer shows 147772km. The speedometer started acting up right after I replaced the battery. I am using a basic OBD2 scanner which shows code P0601 and P0603. The error message on the dash just says System Error without additional details. I tried the drive cycle you suggested but the error persists. I guess there might be something more serious going on with the control module rather than just a basic computer reset being needed. I will probably need a proper vehicle inspection to diagnose the exact issue. Since the car diagnostics showed persistent error codes even after multiple drive cycles, I am considering taking it to a specialist who can properly check the onboard diagnostics system.

Thanks for providing those details, those specific error codes (P0601 and P0603) are actually quite telling. My A4 showed the exact same codes after a battery replacement, and they point to internal control module memory issues. A basic computer reset and drive cycle wont fix this since these codes indicate a potential PCM (Powertrain Control Module) malfunction. When I had this issue, even after multiple drive cycles the onboard diagnostics kept showing the same codes. Getting it checked by someone with advanced diagnostic equipment is the right call. In my case, the control module needed reprogramming, which cost around 400 Euro. If the module itself is faulty, replacement costs typically run 800-1200 Euro including programming. Make sure they check the exhaust system sensors too, sometimes these can trigger similar symptoms and its worth ruling out before replacing expensive components. Also, ensure they verify all systems are communicating properly after the battery change, as sometimes network issues can mimic control module failures. A regular emissions test wont pass until this is resolved, as these codes indicate core system issues that prevent proper system readiness status completion.

Thanks everyone for the helpful feedback. After considering your advice, I understand my situation better now. The P0601 and P0603 codes showing up right after the battery change definitely point toward control module memory problems. I see now why a simple computer reset and standard drive cycle did not resolve the issue. Car diagnostics clearly indicate I need professional help beyond my basic OBD2 scanner capabilities. The persistent error codes after multiple drive cycles suggest a deeper issue. Really appreciate the cost breakdown, helps me budget between 400-1200 Euro depending on whether reprogramming or full module replacement is needed. I will have them check the exhaust system sensors as suggested before jumping to expensive repairs. Good point about making sure all systems are properly communicating after the battery change. The OBD readiness monitors clearly won't complete until the underlying control module issue is fixed. Will book an appointment with a specialist who has proper diagnostic equipment to pinpoint the exact problem. Thanks for helping me understand this goes beyond basic troubleshooting.