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.
Test 09 Status Mileage In Km
Information and matching of any difference occurring between the km reading in the encoding connector and the redundant value soldered in the EEPROM.
e.g. display GWSZ---signifies identical readings from EEPROM "E" and EEPROM "I"
(E = external EEPROM in encoding connector)
(I = internal EEPROM in instrument cluster) e.g. display on GWSZ 012654 I
There is a difference in the km readings stored in memory. The value displayed (e.g. 012654 I) is always the lower reading.
The supplement "I" indicates that this is in the internal, i.e. the soldered EEPROM. An "E" signifies the external EEPROM (encoding connector).
In addition, if counter readings differ, the manipulation point lights up.
After replacement of cluster or encoding connector, the higher km reading in the EEPROM can be matched to the lower reading by holding down the reset button when selecting the test function 09 for > 4 secs. At this point, the SIA data is also transmitted. After successful matching, the manipulation point disappears.
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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.