Crown incorrect vehicle coding

Error messages appearing on multiple displays concurrently often indicate a CAN bus communication issue, but if it's coding-related as you suspect, it could be a control module expecting different parameters than it's receiving. Considering the error memory also stores the fault, have you had the specific fault code read using an OBD-II scanner? Knowing the exact code will help pinpoint which module is misbehaving. Do you know if the vehicle's software has been refreshed recently, either at a dealership or aftermarket?

Thank you so much for your prompt response! I did have the codes read, but I didn't write them down, silly me. I do recall something about a communication error with one of the modules. As for software refreshes, I'm not entirely sure. Is there a way to check if the software has been refreshed without going to a dealer?

Without the specific code, diagnosis remains difficult. Unfortunately, determining the refresh history without specialized tools or dealer records can be tricky. Given the symptoms and your suspicion of a coding issue, it would be prudent to have a professional scan performed. A workshop with Toyota diagnostic equipment can properly read the codes and check the software versions on each module to verify coding compatibility. Avoid attempting to reset codes without understanding the root cause, as this can sometimes mask the underlying problem.

Just wanted to thank you for your help! I took it to a local garage who specialise in engine diagnostics, and you were spot on: incorrect vehicle coding was the root cause! They recoded the control module, cleared the fault codes, and everything seems to be running smoothly now. Total cost was 360€. Thanks again for pointing me in the right direction!