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The 2014 Chevy Impala has oxygen sensors positioned before and after the catalytic converter. Generally, spark plugs should be replaced every 100,000 miles, unless they are copper, in which case they should be replaced every 30,000 miles. The air filter should be changed every 15,000 to 30,000 miles, and the coolant should be swapped out every 60,000 miles. It's common to encounter various engine issues, such as loose gaskets needing tightening, spark plugs popping off causing problems, and engine overheating, which could result in fires or explosions. Regular maintenance is important to address problems like excessive oil consumption, oil leaks, and the timely replacement of oil.
The oxygen sensors on the 2014 Chevy Impala can be found above and below the catalytic converter.