Parts for your 2004 Toyota Wish-Camshaft sensor

2004 Toyota Wish camshaft-sensor: purpose, servicing and replacement

Based on Toyota technical publications, the 2004 Toyota Wish is fitted with a camshaft position sensor (often labelled “G2” in Toyota diagrams). Toyota’s New Car Features (NCF) and Repair Manual sections for the 1ZZ‑FE (1.8L) and 1AZ‑FSE/1AZ‑FE (2.0L) engines, along with the Electrical Wiring Diagram (EWD) for ZNE10/ANE10 series (2003–2005), show the camshaft-sensor as part of the engine control system and VVT‑i strategy. These documents also reference diagnostic trouble codes such as P0340/P0343 for the CMP circuit, confirming the sensor’s presence and role.

On the 2004 Wish, the camshaft-sensor tells the ECU exactly where the intake cam is relative to the crank. That live position data is critical for quick starts, proper sequential fuel injection, ignition timing, and VVT‑i control. With accurate cam timing feedback, the ECU can trim spark and fuel for smooth idle, better fuel economy, and solid low‑down torque—handy for urban runs and weekend family trips alike.

Typical symptoms of a camshaft-sensor on the way out include:

• Long crank or no‑start when hot or cold
• Rough idle, flat spots, or reduced power
• Higher fuel use and occasional misfires
• Check Engine Light with codes like P0340/P0343

There’s no scheduled replacement for this sensor, it’s a “fit and forget” part unless faults appear. As part of routine servicing, a savvy workshop will check the harness routing along the rocker cover, ensure the connector is clean and locked, and look for oil seepage from the sensor O‑ring. Oil contamination and brittle wiring are common culprits behind intermittent signals on higher‑kilometre vehicles.

When replacement is needed, it’s a straightforward job: disconnect the battery, locate the sensor at the timing chain end of the cylinder head (position varies slightly by engine variant), unplug the connector, remove the retaining bolt, and withdraw the sensor. A light smear of clean engine oil on the new O‑ring helps it seat without damage. Refit, tighten to the factory spec, reconnect, clear any stored codes, and road test. The ECU does not usually require special programming, it will adapt once a good signal is restored.

Owners are best served by quality OEM or reputable aftermarket sensors. Cheap units can cause erratic signals, leading to the same drivability complaints they’re meant to cure. If the Check Engine Light returns after replacement, a proper diagnosis of the crank sensor, timing chain wear, and wiring integrity is worthwhile.

Does a 2004 Toyota Wish have a camshaft-sensor?

Yes. Toyota’s NCF, Repair Manual, and EWD for the ZNE10/ANE10 series show a camshaft position sensor (G2 signal) on both 1ZZ‑FE and 1AZ‑series engines. It’s integral to VVT‑i and sequential injection control.

Where is the camshaft-sensor located on a 2004 Wish?

It’s mounted on the cylinder head at the timing chain end. On the 1ZZ‑FE and 1AZ engines it sits near the top of the head, secured by a single bolt, with an O‑ring seal and a two‑ or three‑pin connector depending on variant.

Can the Wish be driven with a faulty camshaft-sensor?

It may run poorly, be hard to start, or stall, and fuel use can climb. Continued driving isn’t recommended, prompt diagnosis and sensor replacement helps avoid further issues and keeps emissions in check.