Subaru R2's Multiple Error Displays Signal ECU Issue

I experienced similar symptoms on my Subaru Justy (2009) when multiple error messages appeared across the displays. Using an OBD-II scan tool revealed several stored fault codes pointing to a communication issue between control modules. The root cause was incorrect coding after a battery replacement. The vehicle control modules lost their configuration settings, causing communication failures across the CAN bus network. This triggered the check engine light and various error messages. The fix required proper diagnostic equipment to reset and recode the control modules. A basic scan tool from an auto parts store would not have been sufficient, the job needed professional engine diagnostics with manufacturer-specific software. While not mechanically serious, this issue needed attention from a workshop with the right diagnostic scanner and coding capabilities. Leaving it unfixed could have led to more system malfunctions and potential safety concerns with things like airbag systems and engine management. My suggestion would be to find a specialist familiar with Subaru diagnostics systems. They should first perform a complete system scan to verify if your symptoms match a coding issue versus a more serious electronic or mechanical problem.

Thanks for the detailed information about the control module coding issue. I experienced nearly identical problems with my R2 last year showing those same error messages and check engine warnings. This really sounds like what was happening with my car too. Did you track how much you ended up paying for the diagnostic work and recoding? In my case, a few weeks after the fix I noticed the radio would occasionally reset itself. Just wondering if you had any lingering electronic quirks pop up after your repair was done?

After taking it to a Subaru specialist with proper engine diagnostics equipment, the malfunction indicator and error messages were completely resolved. The total cost came to 360€ for the control module recoding work. Unlike your experience with the radio resets, I have not noticed any electronic issues since the repair. The OBD-II scan shows all systems are communicating properly, and the check engine light has stayed off. The fix addressed all the communication problems between the control modules. The key was having the correct diagnostic software to properly recode the vehicle systems. A basic scan tool would not have been enough to resolve these types of electronic faults. The specialist confirmed the original diagnosis, the control modules had lost their proper configuration settings, causing the multiple error messages. If your radio is still resetting, I would suggest having the battery and charging system tested, as intermittent power issues can cause similar symptoms with the electronics.

After your reply, I finally decided to take my R2 to a certified repair shop specializing in Subaru vehicles. I paid 420€ for the full diagnostic scan and control module recoding. The technician confirmed it was exactly what you described, corrupted module settings causing communication errors across the system. The check engine light and error messages disappeared right after they completed the repair. My radio has been working perfectly since then, so it seems the full system reset fixed those unusual glitches too. The diagnostic scanner showed all modules were properly communicating again. Looking back, I was lucky to find your post before spending money at my old mechanic who lacked the right diagnostic equipment. The malfunction indicator has stayed off for 3 months now, and all displays are working normally. Sometimes paying a bit more for the right expertise saves money in the long run.