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.
64 99... Fault 6.1
Instruction:
Start independent parking heater repeatedly following after-running.
After 32 seconds, measure output of fuel metering pump using peripherals box (pin allocation: refer to DIS circuit diagram) and vehicle ground.
Specified Value:
Voltage switches between 0V and 12V
| Question | Measure | |
|---|---|---|
| Is supply voltage O.K.? | No | Replace independent parking heater control unit, refer to 64 12 520 REMOVING AND INSTALLING/REPLACING CONTROL UNIT WITH HEAT EXCHANGER (THERMO TOP S) . |
| Yes | Start independent parking heater repeatedly following after-running. Measure after 32 seconds on the fuel metering pump. | |
| Specified value as above | No | Repair or replace supply wire from independent parking heater control unit to metering pump. |
| Yes | Replace metering pump, refer to 64 12 600 REMOVING AND INSTALLING OR REPLACING FUEL PUMP . | |
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.