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In simpler terms, the 2015 Ford F-150 IWE check valve helps control the front wheel hubs by using vacuum pressure. It's important for switching between two-wheel and four-wheel drive. If the valve malfunctions, the front wheel hubs may not engage properly or might engage unexpectedly, potentially costing around $200 to $300 to replace. If you notice any issues, check the vacuum lines connected to the valve for any damage or disconnections.
If the warning light for the IWE check valve illuminates in the 2015 Ford F-150, it's important to inspect the valves connecting the vacuum box to the solenoid.