Parts for your 1999 Toyota Echo|yaris-Camshaft sensor

1999 Toyota Echo/Yaris Camshaft Sensor — What it does and how to look after it

Technical sources confirm the 1999 Toyota Echo/Yaris is fitted with a camshaft position sensor. Toyota’s Repair Manual for Echo/Yaris (Engine Control System sections for 1SZ‑FE/2NZ‑FE/1NZ‑FE), the Toyota New Car Features for these engines (SFI and VVT‑i descriptions), the 1999 Electrical Wiring Diagram (CMP “G” signal to ECM), and Toyota’s Electronic Parts Catalogue all identify a camshaft position sensor on these models. Haynes and Autodata coverage for 1999–2005 Yaris/Echo echo the same.

The camshaft sensor on a 1999 Echo/Yaris is a quiet achiever. It tells the engine computer exactly where the intake cam is, so it can fire the injectors in the right order, control VVT‑i properly, and sharpen cold starts. Paired with the crank sensor, it keeps timing spot‑on for smooth idle, decent economy, and clean emissions across Aussie and Kiwi conditions.

When this sensor gets lazy or fails, the car can crank longer, stumble at idle, feel flat off the line, and trigger the check engine light with faults like P0340 or P0341. Because VVT‑i relies on accurate cam feedback, a crook sensor can also make the engine hesitant or noisy under the bonnet.

There’s no routine interval to replace the cam sensor, but a bit of prevention goes a long way. Regular oil changes with the correct grade keep varnish at bay, which helps both the sensor signal and VVT‑i behaviour. During servicing, it’s worth a quick look at the sensor plug and loom for brittle insulation, oil wicking, or a loose connector.

Replacement is a straightforward driveway job for a confident DIYer. Under the bonnet, pop off the engine cover, locate the sensor on the cylinder head at the timing chain end (intake side), unplug the 3‑pin connector, remove the small retaining bolt, and ease the sensor out. Lightly oil the new O‑ring, seat the new sensor, refit the bolt, reconnect, and clear any stored codes. Always tighten to the spec in the factory manual rather than guessing with the spanner.

Pro tips they’ll appreciate:

• Rule out look‑alike faults first: a sticky oil control valve or stretched timing chain can mimic cam sensor issues.
• Use quality parts, cheap sensors can cause intermittent gremlins that are hard to chase.
• If water’s been through the engine bay, check for corrosion inside the connector before condemning the sensor.

Signs it’s time to act include hard starts, rough idle, random stalling at lights, noticeable drop in fuel economy, or those P0340/P0341 codes returning after clearing.

Popular questions

Where is the camshaft sensor on a 1999 Echo/Yaris?
The sensor sits on the cylinder head at the timing chain end, by the intake cam. Remove the plastic engine cover and you’ll see a small, barrel‑shaped sensor held with a single bolt and a 3‑pin connector. Access is usually straightforward with basic hand tools.

Can the camshaft sensor be cleaned, or does it need replacing?
It’s a solid‑state Hall/reluctor sensor, so there’s nothing serviceable inside. You can wipe off any oil film or grit and reseat the connector, but if the internal electronics are failing or the signal is erratic, replacement is the fix. Check the oil control valve and timing chain condition before blaming the sensor.

Do all 1999 Echo/Yaris engines use this sensor?
Yes. The 1SZ‑FE (1.0 L), 2NZ‑FE (1.3 L) and 1NZ‑FE (1.5 L) run sequential injection and VVT‑i, both of which depend on the camshaft position signal. Toyota’s factory manuals, EWDs, and parts listings for the XP10 platform all show a camshaft position sensor fitted.