Unique-Bargains Camshaft Position Sensor ZJ1018221 Mazda Miata 1999-2005

Replacement Camshaft Sensor for Miata 1999-2005

This new sensor replaces the original camshaft position sensor on Mazda Miata models from 1999 through 2005. It matches OE number ZJ1018221 and cross-references BP4W18230 and SU4349. The three-pin connector and 7.2 mm mounting hole align with factory specifications. Designed for DC 12 V vehicle electrical systems.

Upgrade From Failed or Degraded Factory Sensor

The part replaces a sensor that has failed or sends erratic signals causing rough idle, stalling or a check-engine light. Swapping it restores accurate camshaft timing data to the engine computer. The jump is worth it when diagnostics confirm a camshaft position circuit fault rather than wiring or mechanical timing issues. Non-OEM construction means it is an accessory alternative, not a genuine Mazda component.

Limits of 12 V Three-Pin Hall-Effect Interface

Operation is limited to the DC 12 V supply and three-pin signal interface used on the 1999-2005 Miata engine harness. The 7.2 mm installation hole fixes mounting geometry; no adapter brackets are included. Signal output follows the factory voltage waveform expected by the ECU. The sensor does not add programmable features or altered timing curves beyond the original design.