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In the 2010 Ford Focus, you can find the coolant temperature sensor nestled in the coolant pipe, just below the air intake pipe and tucked behind the right cylinder head. It's recommended to have the coolant changed roughly every 60,000 miles. Your air filter should be replaced every 15,000 to 30,000 miles. When it comes to spark plugs, the general recommendation is to swap them out every 100,000 miles, unless you're using copper spark plugs, in which case they should be replaced every 30,000 miles. Keep an eye on your engine for potential issues such as loose gaskets, loose spark plugs, oil leaks, and the critical problem of engine overheating, which can lead to dangerous situations like fires or even explosions. Additionally, excessive oil consumption may necessitate more frequent oil changes than originally planned.
The 2010 Ford Focus has its coolant temperature sensor placed in the coolant pipe, right under the air intake pipe and behind the cylinder head on the right side.