Complaint Check engine light illuminated
Mercedes-Benz technical service bulletin LI20.10-P-074284 for 2022 Mercedes-Benz S 580 4matic, 2022 Mercedes-Benz S 500 4matic and 2022 Mercedes-Maybach S 680 4matic.
- Bulletin number
- LI20.10-P-074284
- Component
- Equipment
- Summary
- Complaint Check engine light illuminated. Fault code P012800 current or stored in MRG1AMGV8 control unit. Cause Thermostat may not close completely Remedy 1-Perform coolant warmup test via fault P012800 and save the results 2-Drain coolant through fine sieve or filter and check for debris. 3-Remove and replace coolant thermostat. Check for any debris in thermostat or connections on engine. If debris found in step 2 or 3, flush engine and take pictures of debris. 4-Refill cooling circuit and clear faults. Warm engine during test drive. Allow to cool 6 hours. 5-Repeat coolant warmup test and save results. If LI was previously applied to the vehicle open a PTSS case with the below documents. -Initial quick test -MRG1AMGV8 control unit log -Coolant warmup tests before and after repair from previous visit -Coolant warmup test from current visit
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