The most obvious confirmation of a faulty MAP sensor is that the engine computer will send out a diagnostic code causing the "Check Engine" light to come on. Most cars made since the 1990s can be be connected to a diagnostic tool, commonly called a "code reader," that will display these codes and interpret the underlying causes. Some cars can display these codes without a code reader by following certain steps, but this will only give a numeric code that must be looked up. However, sometimes an engine code will incorrectly indicate a faulty MAP sensor. This is commonly caused by a leak in a vacuum hose or port attached to the intake manifold. Prior to replacing a MAP sensor, inspect the vacuum lines and repair them as necessary. This alone may solve the MAP sensor problems.
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