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Parts for your 2007 Holden Astra-Crank angle sensor
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2007 Holden Astra crank angle sensor — what it does and when to replace it
Yes, the 2007 Holden Astra (AH series) uses a crank angle sensor — GM calls it the crankshaft position sensor (CKP). This applies to the common petrol Z18XER and SRi turbo Z20LEH engines, as well as the 1.9 CDTi Z19DTH diesel. Technical sources that specify the CKP for these engines include GM GlobalTIS/Service Information for Astra H/AH (Engine Controls – Crankshaft Position Sensor), the Opel/Vauxhall Astra H workshop manual, and Bosch engine management references for ME7/MED9 (petrol) and EDC16 (diesel).
On the Astra, the crank angle sensor continuously reads a toothed wheel on the crankshaft and feeds precise speed and position data to the ECU. The ECU uses that signal to time fuel injection, ignition, variable valve timing and misfire detection. If the CKP signal drops out or gets noisy, expect rough running, long cranking, stalling, or a no‑start. The check engine light often logs codes like P0335–P0339 or P0315.
This isn’t a routine “service item” to replace on schedule. Instead, it’s checked during servicing for clean operation and healthy wiring. Good practice on an Astra service is to:
- Scan for CKP‑related fault codes and crank variation learned status after any drivability complaint.
- Inspect the sensor connector and harness routing low on the block (heat and oil can embrittle the loom).
- Check for oil leaks that can wick into connectors and affect the signal.
When replacement is needed, it’s a straightforward job for a competent DIYer or mechanic. The sensor is mounted to the engine block reading the crank reluctor — commonly low on the block near the transmission bellhousing on Z18XER/Z19DTH, and near the timing side on Z20LEH. Expect one retaining bolt and an O‑ring. Disconnect the battery, unplug the connector, remove the bolt, twist the old sensor free, lightly oil the new O‑ring, refit, and torque the bolt to the manufacturer spec (usually around single‑digit Nm, check the exact spec for your engine). Clip the harness away from the exhaust and rotating parts.
After fitting, clear codes and, where specified by GM SI, perform a crankshaft variation learn with a scan tool so the ECU has a clean reference. Using a quality OEM‑grade sensor (ACDelco/Delphi/Bosch) pays off, as cheap copies can have weak signal output and cause intermittent hot‑start issues.
Technical sources referenced: GM GlobalTIS / Service Information for Astra H/AH Engine Controls (CKP Sensor) 2004–2010, Opel/Vauxhall Astra H Workshop Manual – Engine Controls, Bosch ME7/MED9 and EDC16 system descriptions (ESI[tronic]).
Popular questions about the 2007 Holden Astra crank angle sensor
Where is the crank angle sensor on a 2007 Astra?
On most 1.8 petrol (Z18XER) and 1.9 diesel (Z19DTH) models it’s low on the engine block near the gearbox bellhousing, reading the flywheel/reluctor. On the 2.0 turbo (Z20LEH) it’s mounted by the crank pulley/timing end. It’s a small two‑ or three‑wire sensor with a single retaining bolt.
If in doubt, check the engine code and consult the engine controls section of the Astra H/AH service info for the exact location diagram.
What fault codes point to a bad CKP on an Astra AH?
Common ones are P0335 (CKP circuit), P0336 (range/performance), P0337/P0338 (low/high input), P0339 (intermittent), and P0315 (crank variation not learned). Intermittent hot‑start, sudden stall with no RPM on the tacho while cranking, and these codes together strongly suggest CKP or its wiring.
Should the crank angle sensor be replaced as preventive maintenance?
No. It’s replaced on condition. During routine servicing, inspect the loom and connector, and keep oil leaks under control. If symptoms or codes appear, test the signal and resistance per the service manual and replace with an OEM‑grade part if out of spec. A relearn may be required after replacement.
