EGR Boost Sensor (Miata)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, 2002 Mazda MX-5 Miata, and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
Inspect EGR boost sensor for damage or cracks. Inspect vacuum hose for improper routing, kinks or leaks. If no problems are found with vacuum hose or sensor, check for short or open circuits between EGR boost sensor and PCM. If all circuits are okay, replace EGR boost sensor.