Parts for your 2019 Subaru Impreza-Crank angle sensor

2019 Subaru Impreza crank angle sensor — what it does and how to look after it

The 2019 Subaru Impreza (GK/GT) absolutely uses a crank angle sensor — more formally the crankshaft position sensor (CKP). Subaru’s Factory Service Manual for the FB20 engine (Engine Diagnostics, DTC P0335/P0339) describes the CKP and its signal strategy, and Subaru’s Technical Information System and OEM parts catalogues list a dedicated crankshaft position sensor for this model. Those technical references confirm the sensor is fitted and monitored by the ECU.

On the 2019 Impreza, the crank angle sensor is a Hall-effect sensor that reads a toothed reluctor on the crankshaft. It tells the engine control unit exactly where the crank is in its rotation and how fast it’s spinning. That data is the base timing reference for fuel injection and spark, and it’s also cross-checked against the cam sensors for proper variable valve timing. If the CKP goes out to lunch, the ECU loses its place — hard starts, misfires, or a no-start can follow.

There’s no scheduled replacement for the CKP on these cars, and it’s generally maintenance-free. Still, it pays to give it a once-over during major services: check the wiring loom for chafing, make sure the connector is clipped firmly and free of corrosion, and keep an eye out for oil seepage that could contaminate the sensor area. Using the correct engine oil and fixing leaks promptly helps protect it from heat and grime.

Typical signs the Impreza’s crank angle sensor is unhappy include:

• Intermittent crank/no-start or random stalling at idle
• Rough running, misfire, or a dead tachometer during a stall
• Check engine light with codes like P0335 or P0339

Replacement is straightforward for a trained tech: disconnect the battery, access the sensor mounted to the engine block where it reads the crank reluctor, unplug, remove the retaining fastener, swap in a quality OEM-equivalent sensor, and reconnect. No special programming is usually required, clear codes, perform an idle relearn if needed, and road test. Because timing accuracy is critical, cheap or out-of-spec sensors can cause ongoing dramas — sticking with reputable parts is wise. Labour time is modest, so many owners choose to replace the O-ring and inspect nearby wiring at the same visit.

If the car shows the above symptoms, get it scanned before it strands someone under the bonnet in the rain. A quick diagnostic will confirm whether the CKP is the culprit or if wiring, cam sensors, or the reluctor ring are to blame.

Popular questions

Does the 2019 Subaru Impreza have a crank angle sensor?
Yes. The FB20-powered 2019 Impreza uses a crankshaft position sensor (often called a crank angle sensor) to provide the ECU with precise crank position and speed data. Subaru’s service literature and parts catalogues list and test this sensor, related fault codes include P0335 and P0339.

What are the symptoms of a failing crank angle sensor on a 2019 Impreza?
Common tell-tales are hard starting or no-start, sudden stalling, rough idle, misfires, a momentary drop of the tacho to zero, and the check engine light. A scan will usually reveal CKP-related codes. Because these symptoms can overlap with cam sensor or wiring faults, proper diagnosis is key.

How much does replacement usually cost in Australia or New Zealand?
As a ballpark, quality sensors typically run about AUD/NZD $120–$250. Labour is usually 0.5–1.0 hour depending on access and workshop rates, so fitted pricing often lands around AUD/NZD $220–$450. Prices vary by brand, location, and any extra work like loom repairs or sealing oil leaks.