Parts for your 2004 Ford Fiesta-Crank angle sensor

2004 Ford Fiesta crank-angle-sensor — fitted, purpose, and service tips

Yes — the 2004 Ford Fiesta does use a crank-angle-sensor, more commonly listed by Ford as the crankshaft position (CKP) sensor. Technical sources that document it include the Ford TIS workshop manual (Engine Controls, Section 303), the Haynes Ford Fiesta 2002–2008 manual, and Autodata engine management wiring and fault-code references (P0335–P0339 noted for Fiesta 2002–08). Those materials show removal/installation procedures, wiring, and diagnostics for the CKP on both petrol Sigma engines and the 1.4 TDCi.

On this Fiesta, the crank-angle-sensor reads a toothed wheel on the crank (typically a 36‑1 pattern) to report exact crank position and speed to the PCM. That live data is the heartbeat for spark timing, fuel injection timing, sequential operation, misfire monitoring, and even the tachometer signal. If the sensor drops out, the engine usually won’t start, if it’s going flaky, drivers may see intermittent stalling, hard starting when hot, or an engine light with codes like P0335/P0336.

The sensor is mounted at the gearbox bellhousing reading the flywheel on most 1.25/1.4/1.6 petrol and 1.4 TDCi models. It’s a simple piece, but it lives in heat and vibration, so age, oil contamination, or wiring fatigue can cause grief.

It’s not a scheduled service item, but it’s worth a quick look during regular servicing. Keeping the connector clean and secure, routing the loom away from sharp edges, and sorting any oil leaks over the bellhousing area all help sensor longevity.

• Signs it’s unhappy: long crank, random stall at lights, rev counter dropping out, rough idle, engine light with P0335–P0339.
• Quick checks: inspect the plug and wiring for rub-through, look for metal debris stuck to the sensor tip, verify good battery voltage and clean earths.

Replacement is straightforward with basic hand tools. With the engine cool, disconnect the battery negative, remove the airbox for access, unplug the sensor, undo the single retaining bolt, and ease the sensor out (it has an O‑ring). Wipe the mounting face, lightly oil the new O‑ring, seat the new sensor fully, and refit the bolt and plug. Clear any stored codes, then let the PCM settle with an idle learn (idling for a few minutes with accessories off, then a short drive cycle). No coding is normally required on the 2004 Fiesta, the air gap is fixed by design.

Quality matters here — many shops in Australia and New Zealand prefer OE or reputable aftermarket sensors to avoid repeat faults. With a healthy crank-angle-sensor, the little Fiesta starts crisply, idles cleanly, and uses fuel the way it should over hundreds of thousands of kilometres.

Where is the crank-angle-sensor on a 2004 Ford Fiesta?

On most 1.25/1.4/1.6 petrol and 1.4 TDCi variants it sits at the top of the gearbox bellhousing, behind the engine, reading the flywheel. Access is usually from above once the airbox is out, though some workshops go from underneath with the undertray off.

What are common symptoms or fault codes for a failing sensor?

No-start or long crank, hot stalling, erratic tachometer, misfire-like hesitation, and the engine light. Typical codes are P0335–P0339. Wiring damage or oil contamination can mimic a bad sensor, so a quick visual and live-data check helps.

Does the new sensor need programming on a 2004 Fiesta?

No special coding is needed. After fitting, clear DTCs and allow a brief idle relearn. The PCM self-adapts crank sync as the engine runs. If the battery was disconnected, the idle may “hunt” briefly and then settle.