Parts for your 2017 Holden Astra-Crank angle sensor

2017 Holden Astra crank-angle sensor (crankshaft position sensor)

Technical sources confirm the 2017 Holden Astra (BK, Astra K) is fitted with a crank‑angle sensor, commonly called a crankshaft position (CKP) sensor in GM documentation. GM Global Service Information for Astra‑K lists a CKP sensor and a replacement procedure, Opel/Vauxhall Astra K workshop manuals and Autodata likewise detail the CKP function and DTCs (P0335–P0339), and AC Delco and Delphi parts catalogues carry direct‑fit CKP sensors for the 1.4T and 1.6T petrol engines.

What it does: The sensor tracks crank angle and engine speed by reading a toothed reluctor on the crank. The ECU uses this signal to time fuel injection and spark, synchronise with the cam sensor, and run start/stop and knock control. If the signal drops out, the Astra may crank but not start, stall randomly, or log limp‑mode faults.

Common signs it’s on the way out include:

• Hard starting, long crank, or no‑start when hot
• Misfire or rough idle with the tacho jumping
• Engine stalls at lights then restarts after cooling
• Check engine light with P0335–P0339 or companion cam sensor codes

Servicing notes: unlike filters or belts, the CKP isn’t a scheduled replacement item. During routine services under the bonnet, a tech should eyeball the sensor and plug near the block or bellhousing for oil weep, heat‑baked loom, or loose retainers.

Replacement advice: if the sensor tests out of spec or shows an intermittent dropout on a scope, fit a quality OE‑equivalent unit. The CKP on Astra K petrol engines mounts low on the block reading the crank wheel, access varies by variant and may call for raising the vehicle and removing the under‑tray. Expect a small sealing O‑ring, lightly oil it, seat the sensor squarely, and torque the retaining bolt to the workshop spec. Keep the connector clean and routed away from exhaust heat. After replacement, clear codes and carry out a crank variation relearn with a suitable scan tool as per GM SI so the ECU maps the new signal cleanly.

Preventative tips:

• Avoid pressure‑washing connectors
• Fix oil leaks that can wick into the plug
• Use proper clip routing to prevent chafe and heat soak

Where is the crank‑angle sensor on a 2017 Holden Astra?

On the Astra K 1.4T and 1.6T petrol engines, the CKP sits low on the engine block reading the crankshaft’s reluctor wheel, typically near the bellhousing area. Access is usually from underneath with the under‑tray off. Look for a small, single‑bolt sensor with a two‑ or three‑pin connector.

Does the 2017 Astra need a relearn after replacing the crank‑angle sensor?

Yes, GM service procedures often require a crankshaft position variation relearn after CKP replacement or ECU updates. A capable scan tool triggers this procedure. Skipping it can leave fault codes or minor drivability quirks, some ECUs may self‑adapt over time, but the proper relearn is the safe bet.

How much does replacement typically cost in Australia or New Zealand?

Parts usually land between $60 and $200 AUD/NZD depending on brand. Labour is commonly 0.5–1.0 hour, workshop rates vary, so expect a drive‑in total in the $200–$450 range. Corrosion, seized fasteners, or extra shielding can nudge the price up.