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Vacuum leaks with the ford mustang one of the most common cause for the p0172 code to show is a vacuum leak take a look around and see if you can find the vacuum leak heres a great youtube video on how to find a vacuum leak. If you can access live readings you could try applying vacuum directly to the sensor and see how the ecm sees it idle vacuum should be 21 23 in hg or around 75 kpa see if the ecm sees this reading when you apply it manually mechanical problems can cause lower than normal map readings skewing fuel trims rich ben. What is the cost to diagnose the p0172 ford code labor 10 the cost to diagnose the p0172 ford code is 10 hour of labor the auto repair labor rates vary widely across the country and even within the same city. Cool ok this came up bout 3 weeks ago i read the code cleared it checked my intake fittings replaced the spark plugs air filter it came back on the same day i recheck the fittings one right after the maf was a little loose so i tightened it up cleared the code out again now 15