Parts for your 2007 Ford Fiesta-Crank angle sensor

2007 Ford Fiesta crank angle sensor — what it does and how to look after it

The 2007 Ford Fiesta is fitted with a crank angle sensor (also known as the crankshaft position or CKP sensor) across its common engines, including the Duratec petrol (1.25/1.4/1.6) and Duratorq TDCi diesel variants. This is supported by the Ford workshop manual (Fiesta 2002–2008 platform), Haynes Ford Fiesta Petrol & Diesel 2002–2008 manual, and Autodata service information, all of which specify a CKP sensor mounted at the transmission bellhousing reading the flywheel/reluctor teeth. Modern engine management on these Fiestas relies on that sensor for precise timing and fuelling.

On this model, the crank angle sensor feeds the ECU with exact crank position and speed. That lets the ECU time spark and injection down to the degree, and it’s also the reference for misfire detection and rev counter behaviour. If the sensor signal drops out, the Fiesta can be hard to start, may stall at idle, or refuse to run altogether.

It’s not a scheduled service item, but it’s critical, and a quick check during routine servicing pays off. The sensor is typically secured by a small bolt and sealed with an O-ring, with a two‑pin or three‑pin plug. A visual once‑over under the car near the bellhousing is usually enough: look for oil contamination, frayed wiring, loose connectors, or metal debris stuck to the sensor tip. Owners often see intermittent no‑start or random cut‑outs logged as P0335–P0339 when the CKP is on the way out.

• Common symptoms: extended crank, sudden stall, uneven idle, tachometer drop-outs, and poor fuel economy.
• Basic care: keep nearby oil leaks sorted, ensure the loom is clipped away from heat and moving parts, and clear codes after any repair.

Replacement is straightforward for most trims. Disconnect the battery, raise the car safely, unplug the sensor at the bellhousing, remove the retaining bolt, and ease the sensor out. Lightly oil the new O‑ring, seat the sensor cleanly, and route the harness as per factory clips. Most Fiesta CKP sensors are non-adjustable, there’s no air-gap setting, and no programming is needed — just clear fault codes and confirm a clean crank signal on scan data. Quality matters here: genuine or OEM‑equivalent sensors tend to be more reliable, especially on hot starts. Labour time is commonly under an hour for a tidy, corrosion‑free car. If the ECU still flags a crank signal fault after replacement, inspect the reluctor ring/flywheel teeth and the engine earths.

• Popular questions

Where is the crank angle sensor on a 2007 Ford Fiesta?
It’s mounted at the transmission bellhousing, reading the flywheel/reluctor teeth. Access is usually from underneath, look where the engine meets the gearbox. Petrol and TDCi models place it in roughly the same area, secured with a single small bolt and a sealed connector.

What fault codes point to a bad crank angle sensor on a Fiesta?
Typical codes include P0335, P0336, P0337, P0338 and P0339. Drivers may also see random misfire codes because the ECU loses a stable crank reference. If codes return after replacement, check wiring integrity, connector pin fit, and flywheel teeth condition.

Does the 2007 Fiesta need coding after replacing the crank sensor?
No coding is normally required. Fit the new sensor, clear stored faults, and verify live data shows a steady engine speed signal during cranking and idle. If idle is a bit rough straight after battery reconnection, a short relearn drive usually settles it.