Parts for your 2017 Ford Fiesta-Crank angle sensor

2017 Ford Fiesta crank-angle sensor: what it is, why it matters, and how to look after it

Based on technical sources, the 2017 Ford Fiesta definitely uses a crank-angle sensor (also known as a crankshaft position sensor, CKP). Ford’s 2017 Fiesta workshop manual and factory wiring diagrams list the CKP as part of the engine management on the 1.0 EcoBoost, 1.5/1.6 Duratec petrol, and 1.5 TDCi engines, and Motorcraft service part catalogues show a dedicated CKP for these variants. These references confirm it’s a fitted and essential component rather than an optional extra.

On the 2017 Fiesta, the crank-angle sensor is the timekeeper for the whole show. It reads a toothed wheel on the crankshaft and tells the ECU exactly where the pistons are and how fast they’re spinning. With that signal, the ECU can fire the spark and inject fuel at just the right moment, manage idle quality, detect misfires, and keep emissions in check. If the CKP signal goes missing or skew-whiff, you’ll usually cop hard starting, random stalling, poor performance, or a check-engine light with codes like P0335–P0339.

It’s not a scheduled service item, but it’s smart to give it some love during routine servicing. Under the bonnet, a quick visual of the CKP harness and connector is worthwhile: look for oil wicking into the plug, brittle insulation, rubbing on brackets, or a loose mounting. On most Fiesta engines it’s a single-bolt sensor mounted to the block or bellhousing, aligned to the crank’s reluctor wheel.

• Tell-tale symptoms: long crank/no start, intermittent stall, rough idle, misfire at steady cruise, tachometer dropouts, and stored CKP-related DTCs.
• Simple checks: examine wiring, clean the connector, and verify battery health (low voltage can mimic CKP faults).
• Replacement tips: disconnect the battery, remove the retaining bolt, swap the sensor, lightly oil the O-ring, and route the loom exactly as from factory to avoid heat or chafe.
• Relearn/initialisation: the Fiesta’s ECU will usually relearn the crank profile after a short drive cycle. Some scan tools offer a crank profile learn if codes persist—follow the workshop procedure.

Good quality parts matter here—cheap knock-offs can introduce signal noise that’s a nightmare to chase. If the vehicle has had clutch, flywheel, or front pulley work, double-check the sensor air gap and harness routing. Most workshops will allow 0.5–1.0 hour for diagnosis and replacement, depending on engine layout and access. Keep it tidy and it’ll run sweet for many kilometres.

Popular questions

Where is the crank-angle sensor on a 2017 Ford Fiesta?
Location varies by engine. On many 1.6 Duratec cars it’s at the gearbox bellhousing reading the flywheel, on 1.0 EcoBoost it’s typically at the front/side of the block near the crank pulley. It’s a small two- or three-wire sensor with a single retaining bolt and a nearby harness connector.

If unsure, follow the CKP wiring in the engine loom or check the engine section of the workshop manual for the exact spot on your variant.

Do you need to program the Fiesta after replacing the crank-angle sensor?
Usually no special programming is required—the ECU will relearn the crank signal after a few key cycles and a short drive. If a CKP code remains or misfire monitoring won’t settle, run a crank profile learn with a capable scan tool and confirm no wiring or reluctor damage is present.

What are the signs the Fiesta’s crank-angle sensor is failing?
Common signs include hard starting, intermittent stall, uneven idle, sudden loss of power, tach needle dropping to zero while the engine’s still turning, and DTCs such as P0335. Before replacing the sensor, rule out damaged wiring, oil-contaminated connectors, poor grounds, or a weak battery that can mimic CKP faults.