Vehicles Affected: More than 150 model-year 2011-12 Mercedes-Benz S-Class luxury sedans, including the S550, S550 4matic, S63, S600, S65 AMG and S400 Hybrid, all manufactured between March 3 and July 30, 2011
The Problem: The tire pressure monitoring system indicators may only illuminate for a portion of the time required by federal standards, and under certain conditions may not re-illuminate immediately after the vehicle is restarted, as required. If all four wheel sensors are simultaneously malfunctioning or missing, the tire pressure monitoring system will provide an initial warning, but the warning will not automatically repeat on subsequent ignition cycles, failing to remind the driver that the system is offline. Driving unknowingly with incorrectly inflated tires may result in sudden tire failure, increasing the risk of a crash.
The Fix: Mercedes-Benz will begin notifying owners this month, and dealers will reprogram the tire pressure monitoring unit for free.
What Owners Should Do: Owners can call Mercedes-Benz at 800-367-6372 or the National Highway Traffic Safety Administration's vehicle-safety hotline at 888-327-4236, or go to www.safercar.gov, for more info.
Need to Find a Dealer for Service? Go to Cars.com Service & Repair to find your local dealer.