When your Autel scanner shows “0 DTC,” the ECU has no stored Diagnostic Trouble Codes at that moment. That doesn’t guarantee everything’s perfect—it just means no confirmed faults have met the threshold to be saved as codes.
0 DTC simply means there are no stored trouble codes.
Check engine light may stay on with 0 DTC if monitors aren’t ready.
| Type | Meaning |
| Stored (Confirmed) | Typically illuminate the MIL |
| Pending | Awaiting confirmation; may not light the MIL |
| Permanent | Persist until verified fixed via drive cycles |
| History | Previously recorded but not currently active |
1. Read all code categories: View Stored, Pending, Permanent, and History.
2. Check readiness monitors: Ensure monitors are complete before inspection.
3. Open Mode $06 (On-Board Monitoring): Spot developing faults (misfire counts, O₂ tests) before they set codes.
4. Watch live data: Fuel trims, ECT, O₂/AFR activity, misfire counters at idle and during a short drive.
5. Run active tests (bi-directional): Command fans, EVAP purge, injectors, etc., to pinpoint faults.
6. Inspect basics: Battery SOC, gas cap seal, vacuum hoses, intake tract, connectors.
7. Drive and rescan: If real, a fault often reappears as pending/confirmed within 1–2 trips.
Why: Fast Android tablet platform, wide coverage, wireless Bluetooth VCI, live data graphing, Mode $06, readiness at a glance.
Great for “0 DTC” cases: Quickly surfaces pending/permanent codes and incomplete monitors; easy EVAP/gas-cap checks.
Nice add-ons: Works with BT506 (battery tests) and MV108S (videoscope) for deeper checks.
Why: Topology mapping, fast processor, extensive OE-level functions, strong bi-directional control.
For “0 DTC”: Dive into network modules that a basic reader misses; analyze Mode $06 and advanced live data across systems.
Why: OE-level diagnostics and active tests at a more approachable price point than flagship units.
For “0 DTC”: Reads manufacturer-specific codes, runs actuator tests to surface issues before they store.
Why: Combines robust diagnostics with key programming/IMMO capability.
For “0 DTC”: If immobilizer/anti-theft quirks cause no-start with no codes, this tool’s data + IMMO functions help isolate it.
BT506 Battery Tester: Low voltage can mask faults and cause odd “0 DTC” behavior—test and document battery health.
MV108S Videoscope: Inspect EVAP hoses, intake leaks, and connectors without teardown.
CEL on with 0 DTC often points to EVAP—check the gas cap, hoses, and rerun a drive cycle.
If symptoms persist (stalling, poor power, hard starts) or the light stays on with no codes, a shop using MaxiSys Ultra S2 or Elite II Pro can perform deep bi-directional tests, smoke/pressure testing, and system-level analysis.
Not necessarily—there may be pending or permanent issues.
Yes—monitor status is shown clearly, so you can confirm before testing.
Intermittent faults can clear; check History and Permanent sections to track them.
Previously, we took a closer look at the key features and advantages of the MS919. Now, with the brand-new Autel MaxiSys MS919S2 hitting the market, the question is: how does it differ from the MS919, and what upgrades make this new model stand out?
There are several Autel scanner models can program car keys. Including Autel IMMO series: Autel MaxiIM IM508, IM508S, IM508S Pro, IM608, IM608 Pro, IM608S II（also called as IM608 Pro II）， and Autel universal key programming tool KM100. IMMO series comes...
When your Autel scanner shows “0 DTC,” the ECU has no stored Diagnostic Trouble Codes at that moment. That doesn’t guarantee everything’s perfect—it just means no confirmed faults have met the threshold to be saved as c
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