There are lots of variations of the Daihatsu Sirion electric power steering problem. Furthermore there are many Daihatsu models have a common problem with the electric power steering, the Sirion is no exception. The electric power steering (EPS) is the main culprit an probably needs replacing or at very least refurbishing. Another possible solution would be to download the Daihatsu Sirion Repair Manual, therefor by downloading this manual you will be able to future proof all you repairs, servicing and troubleshooting needs for the Sirion.