Save codes and freeze-frame data first. Clear only after repair or a justified check, then monitor whether the fault returns.
What clearing actually changes
The command clears generic codes and some associated information. Emissions self-checks may return to a not-ready state until the vehicle completes the required driving conditions.
Checklist before clearing
A short record preserves evidence that may be essential later.
- Save present and pending codes.
- Capture freeze-frame values.
- Note mileage and symptoms.
- Confirm that the intended repair was completed.
Never clear a code merely to hide an active problem before a sale, inspection or repair visit.
A sensible procedure
Connect OBDPhone®, read and save the complete engine report, then clear only when appropriate. Re-read the codes and observe the next journeys.
Why the light comes back
If the underlying condition remains, the control unit can detect it immediately or after a drive cycle. A returning code is evidence that further diagnosis is needed.
Frequently asked questions
The essential answers.
Does clearing repair the fault?+
No. The code can return if the cause remains.
Why is the light still on?+
The issue may be active or another control unit may be responsible.
Can I clear before an inspection?+
Clearing resets self-checks and does not repair the issue.
This guide supports an initial understanding. It does not replace the vehicle manual, manufacturer safety instructions or an assessment by a qualified professional.