Parts for your 2016 Holden Astra-Camshaft sensor

2016 Holden Astra camshaft sensor — what it does, faults, and when to replace

Based on technical sources including GM Holden/Opel workshop manuals for the 2016 Astra PJ (GTC/VXR) and late‑2016 BK (Astra K), plus Holden/ACDelco electronic parts catalogues and Bosch MED17/Delco E39 engine management documentation, the 2016 Holden Astra is fitted with camshaft position sensor(s) on all commonly sold petrol engines (1.4T, 1.6T and 2.0T), and on equivalent diesel variants where applicable. These systems rely on a camshaft signal for variable valve timing and sequential fuel/ignition control, so a camshaft sensor is absolutely relevant to the 2016 Astra.

On the 2016 Holden Astra, the camshaft position sensor (often shortened to CMP) lets the ECU know exactly where the cam(s) sit relative to the crank. That precise timing is what makes modern variable valve timing work smoothly, helps achieve clean cold starts, and keeps fuel use and emissions in check. With dual overhead cams on many Astra engines, there can be one sensor per cam, so the ECU can track intake and exhaust phasing independently.

When the sensor starts to go off, owners typically see a check engine light and feel rough idle, sluggish take‑off, or longer crank times. Common fault codes include P0340/P0341 (intake cam sensor circuit/performance) and, where a second sensor is fitted, P0365/P0366 (exhaust cam sensor circuit/performance). If the signal fully drops out, the ECU may fall back to limp timing, leaving the car flat and thirsty.

This isn’t a regular service item with a fixed replacement interval. Instead, good servicing habits keep it happy: fresh, correct‑spec oil (dexos2‑approved for the Astra range) helps prevent varnish and metal fines that can interfere with the sensor’s magnetic pickup, tidy loom routing and intact connector seals keep moisture out. As part of normal servicing, it’s smart to give the sensor connector a quick visual once‑over for brittle clips, oil ingress, or chafed wiring.

Replacement is usually straightforward under the bonnet: a simple fastener, an O‑ring, and a plug. On DOHC engines there may be two sensors at the cam cover. Owners should fit quality OEM or reputable aftermarket parts, lightly oil the O‑ring, seat the sensor square, and torque to workshop spec. After installation, clearing codes and performing a cam/crank correlation relearn with a scan tool helps the ECU lock timing straight away. If faults persist, check harness continuity and cam phaser operation before blaming the new sensor.

• Typical symptoms: check engine light, rough idle, hard starting, reduced power, poor fuel economy.
• No routine interval: inspect during services, replace on fault or damage.
• Best practice: correct oil, clean connectors, quality parts, and post‑fit relearn.

Popular questions about 2016 Holden Astra camshaft sensors

Does a 2016 Holden Astra have one or two camshaft sensors?
Most DOHC turbo petrol Astras run two sensors, one for the intake cam and one for the exhaust cam, so the ECU can manage VVT on both sides. Some variants may use a single sensor, but the PJ/BK turbo models commonly fitted in Australia and New Zealand typically have a pair.

What fault codes point to a camshaft sensor issue on a 2016 Astra?
Typical codes include P0340/P0341 for the intake cam sensor and P0365/P0366 for the exhaust cam sensor. These can also flag wiring or timing issues, so it pays to check the loom, oil condition, and cam timing before calling the sensor dead.

Is it safe to drive a 2016 Astra with a bad camshaft sensor?
The car may still run in a fallback mode, but performance and economy suffer and there’s a risk of stalling or failing to restart. It’s best to address the fault promptly to avoid being stranded and to protect the catalytic converter from misfires.