Parts for your 2018 Toyota Prius-Crank angle sensor

2018 Toyota Prius crank-angle sensor (crankshaft position sensor)

Based on Toyota’s own technical publications, the 2018 Toyota Prius (ZVW50 series, 2ZR‑FXE engine) is fitted with a crank-angle sensor, more commonly called the crankshaft position (CKP) sensor. The Toyota Repair Manual available via Toyota TIS (Technical Information System) contains inspection and removal/installation procedures for the CKP on this model, the Toyota Electronic Parts Catalogue lists a CKP sensor for the 2ZR‑FXE, and the Prius diagnostic section includes OBD-II DTCs such as P0335/P0336 relating to the crankshaft position signal. Those manufacturer sources confirm the sensor is present and relevant on the 2018 Prius.

The CKP sensor on a 2018 Prius keeps the engine and hybrid system in lock-step. It tracks the exact crank angle and speed so the ECU knows when to inject fuel, fire the spark, and verify combustion. Because the Prius starts and stops the petrol engine frequently, the ECU relies on crisp CKP data to phase everything instantly—no guessing, no rough starts, just smooth handovers between electric and engine drive.

As a service item, the crank-angle sensor isn’t something that needs routine replacement. Toyota’s maintenance schedules don’t call it out as periodic service, it’s generally “fit and forget” until a fault appears. That said, a bit of care goes a long way. Keeping the engine bay tidy, watching for oil seepage near the timing cover, and making sure harnesses aren’t rubbing through can help the sensor live a long, drama-free life.

If replacement is needed, it’s usually because of a fault code (often P0335/P0336), intermittent stalling, hard starting, or the engine not joining in when the car tries to go READY. Before diving in, make sure the vehicle is completely powered down—not in READY—and keep the smart key well away. Disconnect the 12‑volt negative terminal to prevent unintended cranking by the hybrid system. The sensor is retained by a small bolt and sealed with an O‑ring, use a fresh O‑ring and a light smear of clean engine oil on refit, and route the harness exactly as per the factory clips to avoid chafe. If unsure, a technician with Toyota TIS access can confirm the latest procedures and torque specs.

• Common symptoms of a dodgy CKP: no start, sudden cut-out, rough running, poor fuel economy, MIL/“Check Hybrid System” with CKP codes.
• Quick care tips: keep connectors clean and latched, address oil leaks promptly, and avoid pressure-washing electrical connectors under the bonnet.

Popular questions

Does the 2018 Prius really have a crank-angle sensor?
Yes. Toyota’s Repair Manual (via TIS) and the Prius parts catalogue both show a crankshaft position (crank-angle) sensor on the 2ZR‑FXE engine, and Prius diagnostics list CKP-related fault codes (e.g., P0335). It’s an essential input for engine start/stop control in the hybrid system.

What are the signs the CKP sensor is failing on a 2018 Prius?
Expect hard starting or the engine refusing to join in, “Check Hybrid System” or MIL illuminated, and fault codes like P0335. Some drivers notice intermittent stalling or rough running. Proper scan-tool diagnosis is recommended because wiring faults can mimic a failed sensor.

Is CKP sensor replacement a DIY job on a Prius?
It can be for a competent home mechanic, but care is crucial. Power the car fully off (not READY), keep the key away, and disconnect the 12‑volt negative terminal. Avoid touching any orange high-voltage components. If torque specs or procedure details aren’t on hand, a workshop with Toyota TIS access is the safest bet.