Parts for your 2011 Ford Focus-Crank angle sensor

2011 Ford Focus crank angle sensor (CKP) — purpose, care and replacement

For the 2011 Ford Focus, a crank angle sensor is absolutely used — Ford calls it the Crankshaft Position (CKP) sensor. Technical sources including the Ford Workshop Manual for the 2011 Focus (Section 303-14: Electronic Engine Controls), the Haynes Focus manual (2005–2011), and Autodata service information all list and diagram the CKP sensor as a core engine management component. So yes, it’s fitted and it’s essential.

The CKP sensor keeps the Focus running sweet by telling the powertrain control module exactly where the crankshaft is and how fast it’s spinning. That timing data lets the ECU synchronise fuel injection and spark, manage variable valve timing where fitted, and keep emissions in check. If the sensor signal drops out or goes wonky, the ECU loses sync and the engine can misfire, stall, or not start at all.

On most 2011 Focus petrol engines, the CKP is mounted low on the block near the transmission bellhousing, reading a toothed reluctor on the flywheel. It’s a small, sealed sensor with a single retaining bolt and an O-ring seal. While it’s not a scheduled replacement item, it’s worth an inspection during servicing — particularly the wiring and connector routing near the exhaust and driveshafts, where heat and movement can stress the loom.

Common clues it’s on the way out include:

• Long crank or no-start when hot, then starts again after cooling down
• Intermittent stalling at idle or when coming to a stop
• Tachometer dropping to zero suddenly, rough running, or misfire codes
• Stored DTCs such as P0335–P0339 (CKP circuit/signal)

Replacement is straightforward for a competent DIYer or tech. Disconnect the battery, safely raise the car, unplug the sensor, remove the bolt, swap the O-ring if supplied, and refit the new unit. Clean the mounting face and route the harness exactly as per factory to avoid chafe. Tighten to the workshop spec and clear any fault codes. A scan tool isn’t usually needed for coding on this model, the ECU typically relearns on a short drive cycle. If issues persist, check the reluctor ring for damage and verify signal with a scope.

Quality matters here — a genuine or reputable-brand sensor saves headaches. Given how critical timing is, a strong signal keeps fuel economy, power, and reliability on point across Aussie and Kiwi conditions.

FAQs

Where is the crank angle (CKP) sensor on a 2011 Ford Focus?

It’s typically mounted low on the engine block at the transmission bellhousing, reading a toothed wheel on the flywheel. Access is usually from underneath, remove the splash shield for a clear view. Some variants may place it near the crank pulley, but bellhousing location is the common setup.

Can you drive a 2011 Focus with a failing crank angle sensor?

You might get intermittent running, but it’s risky. A failing CKP can cause sudden stalling or a no-start, which is unsafe and inconvenient. Best bet is to diagnose promptly and replace the sensor before it leaves you stranded.

Does the CKP sensor need programming after replacement?

On the 2011 Focus, no special coding is typically required. Clear any codes, start the engine, and complete a short drive so the ECU can settle trims. If misfire monitoring or idle quality seems off, check for additional faults or wiring issues rather than assuming it needs programming.