Diagnostic Mode 04 - Erase DTC Memory
WARNING: This page is about a different car, the 2024 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Mode 04 makes it possible to erase the DTC memory and to reset all emissions-related diagnostic data. In that way, all faults in the DTC memory in the ECM and TCM are erased. The adaptation values may also be reset.
Emissions-related diagnostic data includes (as applicable):
| - MIL Status |
| - Number of DTCs |
| - Readiness bits |
| - Confirmed DTCs |
| - Pending DTCs |
| - DTC that belongs to freeze frame |
| - Freeze frame data |
| - Test results of specific diagnostic functions |
| - Distance driven with "MIL ON" |
| - Number of warm-up cycles after erasing the DTC memory |
| - Distance driven after erasing the DTC memory |
| - Misfire counter |
NOTE:
Depending on the scan tool and protocol used, diagnostic mode 04 and the information provided may be referred to by a different name.
Procedure
-- Connect the scan tool.
-- Switch the ignition on.
-- Select Diagnostic Mode 03: Interrogating fault memory.
-- Then select Mode 4: Reset/delete diagnostic data.
The scan tool will display "Diagnostic data being erased".
-- Switch the ignition off.