Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Modes Description
The information provided in Modes 01 through 09 displays the various levels of emission related data that may be monitored, as well as the ability to retrieve and read stored DTC trouble codes , erase stored DTC trouble codes, generate readiness codes, and select the various PIDs and Test-IDs used within the modes to monitor the engine, and emission related component parameters.
The following table provides a link to all diagnostic modes that monitor all components and systems which influence the emission quality.
- Depending on scan tool and protocol used, the information displayed may be referred to by different names such as Test-ID (TID), Hex-ID, Component-ID (CID), On-Board Diagnostic Monitor Identifier (OBDMID), or contain no name at all and be referenced by only a number.
| Selectable diagnostic modes | |
| Mode 1: Obtain data → Diagnostic Mode 01: Obtain data . | |
| Mode 2: Obtain operating conditions → Diagnostic Mode 02: Obtain operating conditions . | |
| Mode 3: Interrogating fault memory → Mode 03: Interrogating fault memory . | |
| Mode 4: Reset/delete diagnostic data → Diagnostic Mode 04: Reset/delete diagnostic data . | |
| Diagnostic Mode 05: Check lambda test results → Diagnostic Mode 05: Check lambda test results . | |
| Mode 6: Checking test results of components that are not continuously monitored → Diagnostic Mode 06: Checking test results of components that are not continuously monitored . | |
| Mode 7: Checking test results of components that are continuously monitored → Diagnostic Mode 07: Check test results of components that are continuously monitored . | |
| Mode 8: Tank leak test → Diagnostic Mode 08: Tank leak test . | |
| Mode 9: Vehicle information → Diagnostic Mode 09: Vehicle information . |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.