Keep ignition timing and fuel injection precisely synchronized with the Standard Ignition Engine Crankshaft Position Sensor PC390. It installs as a direct-fit replacement for the 1999-2005 Mazda Miata, reading the rotating crankshaft so the engine control module can time spark and injector events.
- Core job: monitors crankshaft position and rotational speed, then sends that signal to the engine control module for ignition and fuel-injection timing.
- Direct-fit replacement: designed to replace the original crankshaft position sensor on the listed application.
- Signs it may need replacing: hard starting or a no-start, stalling, hesitation, misfire, or an illuminated check engine light — if a failed crankshaft position sensor is the cause, this replaces it.
Because these symptoms can have other causes, diagnose the fault before replacing. The sensor is a common wear item; heat, vibration, and age can degrade its signal over time.
Interchange: CSS835 · SU4350 · CSS9037 · BP4W18221A · BP4W18221B · J5T27071 · Manufacturer part number PC390.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this sensor do?
It monitors the crankshaft's position and rotational speed and sends that signal to the engine control module, which uses it to time ignition spark and fuel injection.
Will it fit my vehicle?
It's a direct-fit replacement for the 1999-2005 Mazda Miata. Check the Buyer's Guide tab to confirm it matches your specific vehicle.
What are the signs of a failing crankshaft position sensor?
Common signs include hard starting or a no-start, stalling, hesitation, engine misfire, and an illuminated check engine light. Diagnose the cause before replacing.
Which part numbers does the PC390 interchange with?
It cross-references CSS835, SU4350, CSS9037, BP4W18221A, BP4W18221B, and J5T27071. The manufacturer part number is PC390.
Will replacing this sensor fix my check engine light?
If a failed crankshaft position sensor is the cause, replacing it addresses that fault. Because the same symptoms have other causes, confirm the diagnosis first.
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