The ABS system monitors your vehicle’s speed, yaw, and the amount of force applied to each tire using sensors in both the front and rear axles. The most common reason for this warning light to come on is because of a bad ABS sensor. There are many different causes of this warning light to come on but from my personal experience here are the most common causes (ranked from the most likely to least likely) 1. What Causes the Run Flat Indicator Inoperative Message? Run flat indicator inoperative means your Mercedes Powertrain Control Module has detected an issue with the system and it will no longer be able to alert you when there is a problem with any of your tires. Now, let’s look at what this particular warning light means. What Does “Run Flat Indicator Inoperative” Mean? It uses a set of sensors such as the ABS sensor (wheel speed) and TPMS (tire pressure monitoring system) to alert you when there is a loss of tire pressure. This can be due to various reasons such as low pressure, punctures, or other issues. In simple terms, the run flat indicator on a Mercedes Benz is a tech feature that is designed to alert the driver when there is a problem with one or more of the tires. How to Fix the Run flat Indicator Inoperative Warning.What Causes the Run Flat Indicator Inoperative Message?.What Does “Run Flat Indicator Inoperative” Mean?.What is the Mercedes Run Flat Indicator?.While these tests relate to performance on the road under those conditions, remember that real-life driving is rarely identical to test conditions. ![]() Speed ratings are based on laboratory tests under specific, controlled conditions. Sports car owners are more likely to encounter this speed rating than owners of typical family sedans.Īlways choose the speed rating that corresponds to your vehicle manufacturer’s specifications, and be sure all four tires have the same rating. Contact the manufacturer to get details on any Z-rated tires. Which of those speeds it refers to will depend on the specific tire. When it does, it represents either a maximum speed of more than 149 mph (240 kph) or 186 mph (300 kph). While it nearly always means a high performance tire for high-performing sports cars, “Z” may actually appear in the middle of a tire’s size information. SPEED RATING ZĪ “Z” rating can mean different things. SPEED RATING WĪ relatively new addition to the speed rating chart, tires with speed rating “W” can achieve a maximum sustained speed of 168 mph (270 kph). Nowadays, it means 149 mph but no higher. Once the highest speed rating a tire could have, “V” used to represent a maximum of 149 mph (240 kph) or more. In earlier incarnations of the speed rating system, “H” stood for “high performance,” which is why it maintains an unusual position in the speed rating spectrum today. If you recall from earlier, the “H” speed rating doesn’t appear after “G” but between “U” and “V.” It represents a maximum speed of 130 mph (210 kph) and is commonly found on sports sedans and coupes. Some manufacturers will insert a “Z” in the middle of the tire size description (right after the aspect ratio) when the tire is rated at “W” or “Y.” And if a tire is rated in excess of 186 mph (300 kph), manufacturer’s usually will list a “Z” within the size description, per industry standards. Many tire speed rating charts also list the “Z” rating as anything over 149 mph. Then, as more manufacturers came out with tires that could handle speeds in excess of 149 mph but still hit a maximum speed at some point, “V” became limited (149 mph instead of 149+ mph) and “W” and “Y” speed ratings were added to the chart. This was for tires whose maximum sustained speed was 149 mph (240 kph) or more. When the speed rating system was first developed, the highest speed rating was the unlimited “V” rating. Manufacturers may also insert “Z” into the size description (in the tire code data between aspect ratio and diameter) for these kinds of tires. ![]() Some tires carry “W” or “Y” speed ratings. Tires with the lowest speed ratings are usually listed as “A” followed by a number– for example, “A1,” “A2, “A3,” and so on. Likewise, some speed rating charts don’t include the “P” rating. “I,” “O,” and “X” speed ratings don’t exist. Instead of appearing after “G,” it falls between “U” and “V” as does the speed to which it corresponds.Īdditional speed rating “anomalies” include the following: Another such quirk is that the letter “H” is out of place. For instance, the system’s European roots give it unusual mile per hour maximums. For example, a tire rated “L” is good for a lower maximum sustained speed than one rated “N.”īut the tire speed rating system isn’t without its quirks. In general, that speed goes up as the rating advances alphabetically. Each letter corresponds to a specific speed. Today’s speed rating system uses letters A through Z. TIRE SPEED RATING SYSTEM QUIRKS AND ANOMALIES
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