Parts for your 2009 Ford Fiesta-Crank angle sensor

2009 Ford Fiesta crank-angle sensor: purpose, service tips and replacement

Based on Ford service information (Ford ETIS and Ford Microcat parts listings), the Haynes Ford Fiesta 2008–2017 workshop manual, and Autodata specs, the 2009 Ford Fiesta is fitted with a crank-angle sensor (commonly called a crankshaft position sensor). It’s used on the 1.25/1.4/1.6 Duratec petrol and 1.4/1.6 TDCi diesel engines, so it’s absolutely relevant to this model year.

The crank-angle sensor tracks the exact position and speed of the crankshaft. The engine control unit (ECU) uses that signal to time fuel injection and spark, and to sync with the cam sensor for sequential injection. On these Fiestas, the sensor reads a toothed reluctor wheel (typically a 36-1 pattern) and sends a clean digital or inductive waveform so the ECU knows when each piston is at top dead centre. No good signal means no go—cranking without starting, misfires, or stalling can all show up.

While the crank-angle sensor isn’t a scheduled service item, it benefits from periodic checks during routine servicing. Heat, vibration, and oil contamination can affect it over time. Common symptoms include intermittent no-start, a dead tach during crank, rough idle, sudden cut-out, poor fuel economy, and fault codes like P0335/P0336. If the Fiesta plays up when hot and then restarts when cooled, this sensor moves high on the suspect list.

• Inspect the sensor connector and loom for oil ingress, broken clips, or rubbed-through insulation.
• Check for metallic debris on the sensor tip and clean carefully if accessible.
• Confirm good battery voltage and solid engine earths—low voltage can mimic sensor faults.

1. When replacing, disconnect the battery and locate the sensor—on most petrol variants it’s mounted near the bellhousing reading the flywheel, on some, it’s by the crank pulley. Diesels are similar.
2. Remove the retaining bolt, ease the sensor straight out, and wipe the mounting bore. Fit a quality replacement with a new O-ring if specified.
3. Route the harness away from the exhaust and moving parts, and clip it as per factory path.
4. Clear codes, then let the engine idle to stabilise. Most Fiestas don’t need special coding, a short drive cycle helps the ECU relearn.

Using reputable brands (OE or equivalent) avoids dodgy signals that can cause random stalls. If the fault is intermittent, don’t forget to check the reluctor wheel through the inspection window for missing teeth or heavy damage.

Where is the 2009 Fiesta’s crank-angle sensor located?

On most 1.25/1.4/1.6 Duratec petrol engines it sits on the gearbox side of the block, reading the flywheel teeth. Some variants place it at the front near the crank pulley. On the TDCi diesels it’s typically at the bellhousing. Access is from above or below depending on tools and engine, with one small retaining bolt holding it in.

Is it safe to drive with a failing crank-angle sensor?

It might start and run poorly, then suddenly cut out, or it may not start at all. A failing sensor can leave the car stranded, so it’s best to sort it quickly. If there’s a P0335/P0336 code or recurring stall/no-start, plan a repair rather than chancing a motorway drama.

What does replacement usually cost and how long does it take?

In Australia and New Zealand, a quality sensor usually lands between AUD/NZD $60–$180 for the part. Labour is commonly 0.5–1.0 hour for straightforward access, some models take longer if space is tight. Many workshops will pair the job with an inspection of wiring and mounts to prevent repeat faults.