Parts for your 2004 Toyota Ist-Camshaft sensor

2004 Toyota ist camshaft sensor: what it does and how to look after it

Based on Toyota’s factory documentation, the 2004 Toyota ist (NCP60/NCP61/NCP65 with 2NZ‑FE 1.3L and 1NZ‑FE 1.5L engines) is fitted with a camshaft position sensor. Technical sources include the Toyota Repair Manual (Engine Control System, DTC P0340/P0341) that illustrates the “Camshaft Position Sensor (G)” on the cylinder head, the Toyota New Car Features (NCF) manual describing VVT‑i control using cam angle feedback, the 2004 Toyota ist Electronic Wiring Diagram (EWD) showing CMP signal “G” to the ECM, and the Toyota Electronic Parts Catalog listing the camshaft position sensor for these engine codes. These references confirm the sensor is relevant and used on this model year.

For the 2004 ist, the camshaft sensor is a small but crucial bit of kit. It tells the engine control module exactly where the intake cam is in its rotation, so the car can fire the injectors in sequence, time the spark precisely, and command VVT‑i to shift cam timing for smooth idle, decent poke, and tidy fuel economy. When this sensor goes out of whack, the ist can be slow to start, feel doughy off the line, drop into limp mode, or light the MIL with codes like P0340/P0341. Because it works hand‑in‑glove with the crank sensor, even a slightly noisy signal can throw the whole timing strategy off.

There’s no fixed replacement interval—service is condition‑based. As part of routine servicing, it’s smart to check the sensor area on the timing‑chain end of the head for oil seepage, brittle wiring, or a loose connector. If replacement is needed, stick with quality (OE Denso is the safe bet), swap the O‑ring, lightly oil it so it doesn’t pinch, and seat the sensor square before snugging the single retaining bolt to the factory spec noted in the workshop manual. After fitting, clear codes and let the ECM relearn idle trim with a short road drive. If a fresh sensor doesn’t resolve repeat P0340/P0341 faults, consider wiring checks and timing‑chain stretch testing, as a slack chain can skew cam position. Avoid blasting the sensor tip with harsh solvents, a gentle wipe is enough. And when washing under the bonnet, keep high‑pressure water away from the connector—moisture intrusion is a common troublemaker.

• Typical symptoms: long crank, rough idle, misfire feel, poor fuel economy, MIL on (P0340/P0341).
• Quick checks: secure connector, no oil in plug, loom not rubbing on the cover, clean but not soaked sensor tip.
• Best practice: quality replacement, fresh O‑ring, correct bolt torque, code clear and road test.

Does the 2004 Toyota ist have a camshaft sensor?

Yes. Both the 1NZ‑FE and 2NZ‑FE engines use a camshaft position sensor for cylinder identification and VVT‑i control, as shown in Toyota’s Repair Manual, NCF, and EWD.

Where is the camshaft sensor on a 2004 ist?

It’s mounted on the end of the cylinder head at the timing‑chain side, held by a single bolt and accessed under the plastic engine cover. Look near the oil filler area and the VVT‑i oil control valve.

When should it be replaced?

There’s no set kilometre interval. Replace it if you’ve got P0340/P0341, hard starting, or an obvious wiring/connector fault. Always rule out loom damage and timing‑chain issues before condemning the sensor.