Before reset
Read stored, pending, and permanent codes if the scanner supports them. Save freeze-frame data, readiness status, symptoms, and mileage. This preserves the context you may need if the light returns.
How clearing works
Most scanners have an erase or clear-code function. Follow the tool prompts with the ignition state required by the vehicle. Clearing may turn the light off temporarily, but it does not repair the fault.
Readiness consequence
Clearing codes usually resets emissions readiness monitors. If you need inspection, the vehicle may need a drive cycle before monitors complete.
When not to reset
Do not clear safety-critical warnings, intermittent faults, or inspection-related codes just to hide symptoms. If the same code returns, the system still needs diagnosis.
After reset
Drive under appropriate conditions, recheck pending codes, confirm monitor status, and record whether the symptom returns. If the repair was correct, the fault should stay gone after the monitor runs.
Frequently asked questions
Can any OBD2 scanner reset a check engine light?
Most engine-code scanners can clear codes, but you should save evidence first and fix the cause.
Will the light stay off after clearing?
Only if the underlying fault does not return during the monitor or self-check.
Does clearing codes affect inspection?
Yes. It can reset readiness monitors, which may delay emissions inspection readiness.
Best next page
Use the OBD2 Scanners guide when this diagnostic path points to a purchase decision. Compare job fit, limitations, compatibility, and the cost of ownership before choosing a model.
Open OBD2 Scanners guideTools to compare next
OBD2 Scanners · $$
ANCEL BD310
A sensible starter candidate for check engine light work when you want more than the cheapest code reader.
- Best for
- Drivers who want a simple handheld screen plus app support.
- Check first
- Confirm your phone compatibility and the functions you need before buying.
Compare fit and alternatives in Best OBD2 Scanner for DIY Mechanics.
OBD2 Scanners · $$$
Innova 5610
Worth shortlisting when you want ABS/SRS style depth without jumping into shop-level scan tools.
- Best for
- DIY users who want a broader feature set than a basic reader.
- Check first
- Advanced functions can vary by vehicle. Check module and service coverage first.
Compare fit and alternatives in Best OBD2 Scanner for DIY Mechanics.
OBD2 Scanners · $$
BlueDriver Pro
A strong candidate for people who would rather use a phone than a handheld scanner.
- Best for
- Phone-first users who prefer app-guided diagnostics.
- Check first
- It is app-dependent, so phone support and update quality matter.
Compare fit and alternatives in Best OBD2 Scanner for DIY Mechanics.
OBD2 Scanners · $
Foxwell NT301
Good for a basic garage kit when the goal is reading codes, not controlling vehicle systems.
- Best for
- Simple code reading and emissions readiness checks.
- Check first
- Do not expect advanced module coverage from a budget reader.
Compare fit and alternatives in Best OBD2 Scanner for DIY Mechanics.
OBD2 Scanners · $
MOTOPOWER MP69033
A budget option for first-step code reading before deeper testing.
- Best for
- Keeping a low-cost code reader in the glovebox or home garage.
- Check first
- Very basic readers do not replace diagnostic judgment.
Compare fit and alternatives in Best OBD2 Scanner for DIY Mechanics.
OBD2 Scanners · $
LAUNCH CR529
A low-cost code-reader candidate for check-engine-light triage and basic readiness checks.
- Best for
- Budget buyers who want live data and emissions readiness in a simple handheld reader.
- Check first
- Do not expect ABS, SRS, or bidirectional controls from this class.
Compare fit and alternatives in Best OBD2 Scanner for DIY Mechanics.