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 Mode 01 - Read Current System Data
Diagnostic Mode 01 makes it possible to access current emissions-related measured values and diagnostic data. The original measured values (no replacement values), input and output data and system status information are displayed using Diagnostic Mode 1.
Depending on scan tool and protocol used, the information displayed in diagnostic mode 01 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.
Test requirement
- Coolant temperature at least 80 °C.
Procedure
-- Connect the scan tool.
-- Start the engine and run at idle.
-- Select "Diagnostic Mode 1: Obtain data.".
-- From the following table, select the desired the "PID" that is to be monitored, e.g. "PID 05-Coolant temperature".
The current values of the component or system that is being monitored will be displayed on the scan tool screen.
| PID | Component or System |
|---|---|
| 04: | Calculated load value |
| 05: | Coolant temperature |
| 06: | Oxygen integrator, bank 1 |
| 07: | Oxygen adaptation value, bank 1 |
| 08: | Oxygen integrator, bank 2 |
| 09: | Oxygen adaptation value, bank 2 |
| 12: | Engine RPM |
| 13: | Vehicle speed |
| 14: | Ignition timing adjustment at 1. cyl. in direction |
| 15: | Intake air temperature (IAT) |
| 16: | Air flow quantity at Mass Air Flow (MAF) sensor |
| 17: | Throttle valve position (absolute) |
| 18: | Secondary air injection (AIR) |
| 19: | Oxygen sensor location |
| 21: | Sensor voltage Bank 1 Sensor 2 |
| 25: | Sensor voltage Bank 2 Sensor 2 |
| 28: | OBD request is designed for diagnostic of this vehicle |
| 33: | Driven distance after MIL on |
| 52: | Oxygen sensor value Bank 1 Sensor 1 |
| 56: | Oxygen sensor value Bank 2- sensor 1 |
-- Switch the ignition off.
NO RELATED
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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.