To fix the SCR system fault, you need to diagnose the problem first. It's like trying to find the source of a mystery smell in your house - you need to investigate and follow the clues. You can start by checking the dashboard warning lights and looking for any error codes on your car's computer system.
Another way to think about it is to compare it to a doctor's diagnosis. Just as a doctor needs to run tests to find the root cause of your illness, you need to run some checks to identify the issue with your SCR system.
For instance, you can use a code reader to scan your car's computer and see if there are any error codes related to the SCR system. It's like using a detector to find the problem, and once you have the code, you can start troubleshooting.