Parts for your 2010 Ford Focus-Crank angle sensor

2010 Ford Focus crank-angle sensor (crankshaft position sensor)

Yes, the 2010 Ford Focus is fitted with a crank-angle sensor, more commonly called the crankshaft position (CKP) sensor. This is confirmed in Ford workshop service information for the 2010 Focus powertrains (Duratec petrol and TDCi diesel), which describe a CKP sensor feeding engine speed and crank position to the PCM/ECU. Independent references such as the Haynes Ford Focus 2005–2011 repair manual and Autodata’s engine management data also list CKP-related diagnostics for this model, including DTCs P0335 and P0339, further verifying the part’s use on the vehicle.

The CKP sensor’s job is to track the exact position and rotational speed of the crankshaft so the ECU can fire the injectors and spark at precisely the right time. On the 2010 Focus it’s a solid-state sensor reading a toothed reluctor on the crank (often via the flywheel or a dedicated ring). Without a clean, consistent CKP signal, the Focus may crank but not start, cut out unexpectedly, or run rough as timing goes out the window. It pairs with the camshaft sensor to keep valve and ignition events perfectly in step.

There’s no set maintenance interval for the crank-angle sensor, it’s essentially a fit-and-forget item. That said, a bit of preventative care goes a long way:

• Keep an eye out for oil leaks under the bonnet. Oil contamination around the bellhousing or sensor area can degrade the connector and wiring.
• If the engine has been out or the clutch/flywheel replaced, make sure the sensor and harness are refitted correctly and routed away from heat and moving parts.
• Scan for fault codes if there’s a no-start, stalling, or random tach needle jump. Codes like P0335/P0339 are common CKP flags.

When replacement is needed, it’s a straightforward job for a competent DIYer or any workshop. Disconnect the battery, access the sensor (typically at the rear of the engine near the gearbox bellhousing on many Focus variants), unplug, remove the retaining bolt, and swap it out. Use a quality part to avoid iffy signals. On some cars, a crankshaft position relearn or idle reset via a scan tool can help the ECU settle quickly after replacement—follow the workshop manual guidance for your specific engine. Always check the harness and connector pins for corrosion or looseness before condemning the sensor itself, poor wiring can mimic a failed CKP.

Signs it’s time to act can include:

1. Hard starting or no-start when hot or cold
2. Sudden stalling at idle or cruise
3. Misfires with timing-related fault codes

With the right diagnosis and a tidy install, the Focus is back to crisp starts and smooth running.

Popular questions about 2010 Ford Focus crank-angle sensors

Where is the crank-angle (crankshaft position) sensor on a 2010 Ford Focus?

On most 2010 Focus engines it’s mounted near the gearbox bellhousing, reading the flywheel/reluctor. Access is typically from above or below depending on the exact engine and intake layout. A service manual diagram helps pinpoint it quickly under the bonnet.

What symptoms point to a failing CKP sensor on a 2010 Focus?

Common signs are intermittent no-start, sudden stalling, rough idle, and engine speed readings that jump around. The ECU often logs P0335 or P0339. Always check the plug and wiring first, as heat and oil can cause intermittent connections that mimic sensor failure.

Do I need to perform a relearn after replacing the CKP sensor?

Many 2010 Focus models will run without a formal relearn, but some benefit from a crank/cam correlation or idle reset using a scan tool. Following the procedure in the workshop manual helps the ECU adapt quickly and avoids rough running after the swap.