Parts for your 2017 Ford Fiesta-Camshaft sensor

2017 Ford Fiesta camshaft sensor — what it does and when to replace it

The 2017 Ford Fiesta is absolutely fitted with a camshaft position (CMP) sensor. Ford’s Workshop Manual for Fiesta (WSM, 2014–2019, Section 303‑14: Electronic Engine Controls) specifies a CMP sensor across the common engines (1.0L EcoBoost, 1.6L Ti‑VCT, and 1.6L EcoBoost ST). Authoritative references like Autodata and the Haynes Fiesta manual (2008–2017) also document CMP signals and related diagnostic trouble codes (P0340, P0341, P0344), confirming the part is integral to the Fiesta’s engine management.

On this model, the camshaft sensor tells the powertrain control module exactly where the cam(s) are in relation to the crank. That lets the Fiesta run precise sequential fuel injection, spark timing, and variable cam timing (Ti‑VCT). It’s especially important for smooth cold starts and clean emissions. Depending on the engine, there may be one sensor (e.g., many 1.0L EcoBoosts) or two sensors monitoring intake and exhaust cams (common on 1.6L Ti‑VCT and 1.6L EcoBoost ST).

It’s a solid-state Hall‑effect sensor, usually mounted on the cylinder head near the timing cover, reading a target on the cam. It’s not a scheduled replacement item, but it is worth a quick check during routine 12‑month/15,000 km servicing: scan for stored cam/crank correlation codes, look for damaged wiring, and make sure the connector is clean and latched. Clean engine oil helps VCT operation and reduces contamination risk around the sensor area.

• Common clues it’s on the way out: longer crank time, rough idle, flat spots, poor economy, limp mode, and a lit check‑engine lamp. Expect codes like P0340/P0341.
• Before replacing, rule out harness rub‑through, oil intrusion in the plug, a weak battery, or timing issues. Many “sensor faults” are actually wiring or timing‑chain related.
• When replacement is needed: disconnect the battery, access the sensor on the head, remove the retaining bolt, renew the O‑ring (lightly oil it), seat the new sensor, and tighten to the Workshop Manual torque. Clear DTCs and complete a short drive cycle so the PCM relearns.
• Use quality parts that match the original connector and spec, cheap copies can throw intermittent faults.

Driving a short distance with a dodgy CMP sensor is possible, but it can cause stalling or poor running. Best to sort it promptly to protect the catalyst and keep fuel use in check.

How many camshaft sensors does a 2017 Fiesta have?

It varies by engine. Many 1.0L EcoBoost Fiestas use one CMP sensor, while 1.6L Ti‑VCT and 1.6L EcoBoost ST engines commonly have two (one for intake, one for exhaust). The quickest way to be certain is to check the engine code or look along the cylinder head for one or two identical three‑pin sensors.

Will a bad camshaft sensor damage the engine?

It typically won’t cause direct mechanical damage, but it can lead to hard starting, stalling, and rich running. If left unresolved, misfires and over‑fueling can stress the catalytic converter. It’s usually fine to drive carefully to a workshop, but don’t ignore the warning light.

Do I need to code or programme anything after replacing the sensor?

No special coding is required for the CMP sensor itself. After installation, clear any fault codes and complete a short drive so the PCM confirms cam/crank correlation. If timing components or VCT hardware were serviced, the PCM will adapt as it relearns, just follow the Workshop Manual steps.