How do I fix the error code P2002 which is caused by filter or sensor in exhaust of car?

The error code P2002 indicates that the efficiency of the diesel particulate filter (DPF) is below the threshold. This can be caused by a number of factors, including:

- A blocked DPF

- A faulty DPF sensor

- A problem with the exhaust gas recirculation (EGR) system

To fix the error code P2002, you will need to:

1. Inspect the DPF for blockages. If the DPF is blocked, it will need to be cleaned or replaced.

2. Check the DPF sensor for damage or contamination. If the sensor is faulty, it will need to be replaced.

3. Check the EGR system for problems. If there is a problem with the EGR system, it will need to be repaired.

Once the problem has been fixed, the error code P2002 should clear.