What if I can't find a paper jam, but the 'E5' error remains on my Canon MP258?

If you've thoroughly checked for paper jams and cleaned the sensors, but the 'E5' error persists, there might be a more serious mechanical problem. This could involve a faulty roller, a damaged paper feed motor, or an issue with the printer's internal components. In this case, it's best to contact Canon support or a qualified printer repair technician for further assistance.