Parts for your 2012 Daihatsu Bego-Camshaft sensor

2012 Daihatsu Bego camshaft sensor: what it does, and how to look after it

Yes, the 2012 Daihatsu Bego (J200-series, 1.5‑litre 3SZ‑VE) is fitted with a camshaft position sensor. This is confirmed by the Daihatsu/Toyota factory service manual for the J200 Rush/Terios/Bego platform (engine control and wiring diagrams identify a Camshaft Position “G” sensor on the cylinder head), and by OEM/aftermarket parts catalogues for the 3SZ‑VE that list a dedicated “camshaft position sensor” for 2012 model-year vehicles.

On this Bego, the camshaft sensor tells the ECU exactly where the intake cam is in its rotation. Working with the crank sensor, it lets the engine fire injectors sequentially, time ignition properly, and run VVT‑i smoothly. That means quicker starts, cleaner idle, better fuel economy, and solid mid‑range pull. If the sensor drops out, the ECU can fall back to a limp strategy (batch injection and fixed cam timing), so it may still run, but it’ll be grumpy — longer cranking, rough idle, lacklustre power, and the MIL on.

It’s not a scheduled service item, but it does appreciate a little attention during regular servicing. Under the bonnet, it lives on the cylinder head near the timing chain end. Check the connector for oil intrusion, the loom for chafing, and keep the area free of grit. If there are drivability niggles or codes like P0340/P0343, rule out basics first: oil level/quality (VVT‑i hates sludgy oil), the VVT solenoid filter screen, and wiring continuity.

When replacement is needed, it’s a straightforward job for a competent DIYer or workshop. Use an OEM‑quality sensor and a fresh O‑ring. With the engine cool, disconnect the battery, unplug the sensor, remove the retaining bolt, and wiggle the sensor out — expect a light weep of oil. Lightly oil the new O‑ring, seat the sensor squarely, refit the bolt to the service‑manual torque, reconnect, clear codes, and verify with a quick road test and live data to confirm stable cam/crank sync and VVT‑i response.

Handy tips they’ll appreciate:

• Scan it first — a scope or live data showing cam/crank correlation saves guesswork.
• Don’t ignore harness damage, intermittent faults often trace back to brittle clips near the head.
• Stick to the correct spec engine oil and change on time, it keeps the timing and VVT‑i happy, which protects the sensor from sludge contamination.

Technical sources referenced: Daihatsu/Toyota J200 (Rush/Terios/Bego, 3SZ‑VE) factory repair manual and wiring diagrams identifying the Camshaft Position (G) sensor, OEM and aftermarket electronic parts catalogues listing “camshaft position sensor” for 2012 J200 3SZ‑VE applications, professional service databases that show CMP inputs for sequential injection and VVT‑i control on this engine family.

Popular questions

Does the 2012 Daihatsu Bego have a camshaft position sensor?
It does. The 3SZ‑VE engine uses a camshaft position sensor on the cylinder head for cam phasing (VVT‑i), precise fuel and spark timing, and quick starts. Without it, the ECU reverts to a basic fallback and the car won’t run at its best.

What are common signs or fault codes of a bad camshaft sensor on a Bego?
Expect longer cranking, rough idle, flat spots, higher fuel use, and the check‑engine light. Common codes include P0340 (circuit) and P0343 (high input). Always check wiring and oil condition before condemning the sensor.

Is it safe to drive with a failing camshaft sensor?
It may run, but it’s not ideal. Performance drops and fuel use rises, and it could let them down at an awkward time. Best to diagnose and sort it promptly to avoid further headaches.