Parts for your 2000 Toyota Bb-Camshaft sensor

2000 Toyota bB camshaft sensor – what it does and how to keep it happy

Yes, the 2000 Toyota bB is fitted with a camshaft position sensor. Toyota’s technical literature for the NZ‑series engines used in the NCP30 bB—specifically the New Car Features for 1NZ‑FE/2NZ‑FE VVT‑i engines and the NCP30 Electrical Wiring Diagram—shows the “Camshaft Position Sensor (G2)” feeding the ECM for valve timing control and sequential injection. Parts catalogues for the bB likewise list a dedicated cam sensor on the cylinder head.

On this model, the camshaft sensor does more than just tell the ECU which stroke the engine’s on. It’s a key input for VVT‑i advance/retard decisions, clean cold starts, smooth idle, and spot‑on fuel and spark timing. When the G2 signal pairs with the crank signal, the ECU knows exactly where each cylinder is in real time, so it can fire injectors sequentially and keep emissions and fuel economy on point. If that signal goes flaky, the bB can fall back to batch injection and fixed timing, which means rough running and extra fuel used.

It isn’t a scheduled replacement item, but it does deserve a look at regular services, especially on higher‑kilometre cars. Oil mist from the timing chain area can wick into the connector, and hardened O‑rings can weep. A quick visual check for damaged wiring and a clean, dry plug pays off. If the dash lights up with P0340 or P0341, or there’s hard starting, random stalling, flat spots, or lousy fuel economy, the cam sensor and its wiring should be tested before chasing anything more dramatic.

• Typical symptoms when the sensor is on the way out: slow or no start when hot, erratic idle, hesitation, poor fuel economy, and a check‑engine light with cam correlation codes.
• Basic replacement outline: disconnect the battery, pop the engine cover, locate the sensor at the timing‑chain end of the head (intake side), unplug, remove the retaining bolt, swap the sensor with a fresh O‑ring, refit, and reconnect. Tighten to the factory spec and clear codes.
• Use a quality OEM‑spec sensor, cheapies can cause weak signals or false codes. Always inspect the loom for brittle insulation near the head.
• No special relearn is typically required on these Toyotas—clear the codes, take a short drive, and the ECU will sort itself.

Looked after properly, the camshaft sensor on a 2000 bB is a low‑drama part that keeps VVT‑i sharp and the little box running sweet.

Popular questions

Where is the camshaft sensor on a 2000 Toyota bB?
It’s mounted on the cylinder head at the timing‑chain end, on the intake side. On cars with the plastic engine cover, it’s just underneath, one small bolt holds it in. The connector points toward the top of the head for easy access.

Is the camshaft sensor a routine service item on the bB?
No, it’s not replaced by schedule. During services, a quick check for oil in the connector, a perished O‑ring, or chafed wiring is wise. Replace the sensor only if it’s faulty or contaminated and logging cam correlation faults.

Does the ECU need a relearn after fitting a new cam sensor?
Generally, no special relearn is needed on this Toyota. Clear any stored codes, start the engine, and take a short drive. If the wiring and timing are sound, the ECU will adapt on its own.