Parts for your 2019 Ford Focus-Crank angle sensor

2019 Ford Focus crank-angle sensor

Yes, the 2019 Ford Focus does use a crank‑angle sensor (commonly called the crankshaft position or CKP sensor). Ford’s Workshop Manual for the 2018.75MY–2019 Focus (C519) under Electronic Engine Controls, Sections 303‑14A/303‑14B, lists and tests the CKP sensor for the 1.0L and 1.5L EcoBoost engines, and Motorcraft wiring diagrams show the CKP signal going to the PCM. Modern Bosch/Ford engine management on these engines relies on a toothed reluctor and CKP input for timing and misfire monitoring.

The sensor reads the crankshaft’s position and speed as it rotates past a toothed wheel. The PCM uses that live data to fire the spark, schedule fuel injection, sync with the cam sensor for variable valve timing, and check for misfires. If the signal drops out, starting becomes hard, idle gets rough, power can dip into limp‑home, and the check engine light usually comes on.

There’s no scheduled maintenance for the CKP itself, but it pays to keep the connector clean and the harness clipped away from heat and sharp edges. Oil leaks can soften the sensor’s O‑ring, so fix any weeps around the rear main or timing cover early. Typical fault codes include P0335–P0339, confirm with a scan tool and scope the CKP waveform if available.

Replacement on the Focus is straightforward for a competent home mechanic. Use axle stands, not just a jack, and disconnect the negative battery terminal. On most 1.0L/1.5L EcoBoost models the CKP sits low on the block near the transmission bellhousing, access is from under the car with the lower splash shield off. Unplug the connector, remove the retaining bolt, twist the sensor free, lightly oil the new O‑ring, install and torque to spec, and route the loom exactly as from factory. Clear codes, start the engine, and perform a crank variation relearn with a capable scan tool, then road‑test to verify stable idle and no pending faults. Use a genuine or high‑quality equivalent sensor—cheap copies can cause intermittent no‑start or random stalls. Expect around 0.5–1.0 hour workshop time. If faults persist, check the reluctor wheel for damage and verify engine grounds and PCM power supplies too.

Where is the crank-angle sensor on a 2019 Ford Focus?

On most 1.0L and 1.5L EcoBoost petrol engines it’s mounted low on the block near the transmission bellhousing, accessed from underneath with the splash shield removed. Placement can vary slightly by engine variant, so confirm by VIN in service information if unsure.

What symptoms show a failing crank-angle sensor on this model?

Hard starting or no‑start, intermittent stalling, rough idle, misfires, sudden loss of power, and the check engine light. Common fault codes are P0335–P0339. If symptoms are random, inspect the connector and wiring for heat damage or poor earths as well.

Does a new crank-angle sensor need programming?

The Focus will usually start without special programming, but a crank variation relearn with a capable scan tool is recommended to stabilise idle quality and misfire monitoring. Clear fault codes and check for software updates if issues continue.