Parts for your 2009 Ford Focus-Camshaft sensor

2009 Ford Focus camshaft sensor — what it does, when to replace it, and how it keeps the Focus running sweet

Technical sources confirm the 2009 Ford Focus is fitted with a camshaft position (CMP) sensor across its common petrol and diesel engines. Ford’s Workshop Manual (WSM, section 303-14 Electronic Engine Controls) details CMP sensor diagnostics and removal/installation for the Focus engines of this model year. The Motorcraft/Ford service parts catalogue also lists a CMP sensor for 2009 Focus variants, and independent data from Autodata and Haynes coverage for the 2005–2011 Focus family include wiring diagrams and fault codes referencing the CMP sensor. So, yes — this part is relevant and used on the 2009 Focus.

• Ford Workshop Manual (WSM) 303-14: Electronic Engine Controls — Camshaft Position (CMP) sensor procedures
• Motorcraft/Ford service parts catalogue for 2009 Focus
• Autodata technical data and pinouts for 2009 Focus engine management
• Haynes manual coverage for Focus Mk2/Mk2.5 including CMP diagnostics (DTCs P0340–P0344 range)

On a 2009 Ford Focus, the camshaft sensor tracks the cam’s precise position so the ECU can fire the injectors in sequence and time the spark correctly. On engines equipped with variable cam timing, it also helps the ECU keep valve timing on the money under load. The payoff is clean starts, smooth idle, decent fuel economy, and low emissions — the everyday stuff drivers in Australia and New Zealand want when they pop the bonnet and head off down the motorway.

This sensor isn’t a regular “service item”, but it benefits from a quick look during scheduled maintenance. A tech will usually check the connector for broken clips, oil ingress around the O-ring, and cracked wiring near the plug. A light mist of oil from the rocker cover can track down to the plug and cause drama, so keeping leaks sorted helps the sensor live a long life.

When a CMP sensor starts to go pear-shaped, the Focus may crank longer when cold, stumble at idle, feel flat through the revs, or drop into a limp mode. The check engine light will likely be on with codes in the P0340–P0344 range. Because the ECU can sometimes “guess” from the crank sensor, the car might still run — just not happily. It’s best sorted promptly to avoid poor fuel use and misfires.

Replacement is straightforward: disconnect the battery, access the sensor on the cylinder head near the timing cover/cam sprocket area, unplug the connector, remove the retaining fastener, and swap the sensor and seal. Using an OEM-quality part and cleaning the mating face pays off. If a fresh sensor doesn’t clear the fault, a pro should check the timing belt/chain alignment, the crank sensor signal, and wiring continuity — all common culprits that can mimic a dodgy cam sensor.

• Tip: On high-kilometre Focus models, always inspect harness routing and heat shielding near the exhaust side of the head — heat-hardened looms can crack and throw intermittent cam sensor faults.

Popular questions about the 2009 Ford Focus camshaft sensor

Where is the camshaft sensor on a 2009 Focus?
It’s mounted to the cylinder head, positioned by the cam sprocket/timing cover area. Exact orientation varies by engine: many petrol engines place it at the top or end of the head near the rocker cover, while diesel variants commonly sit near the front cover. A quick visual under the plastic engine cover usually spots the small, two- or three-pin sensor with a single retaining bolt.

Is it safe to drive with a failing camshaft sensor?
The Focus may run using crank-sensor “fallback”, but starting, economy, and power can suffer, and it may stall or go into limp mode. It’s generally fine for a short hop to a workshop, but not ideal for a long trip. Sorting it sooner protects the catalytic converter and saves fuel.

Does the camshaft sensor need routine replacement?
No. It’s replaced on condition. During regular servicing, technicians simply check for oil leaks, damaged wiring, and fault codes. If symptoms or codes point to the CMP, replacement is quick and doesn’t usually require major disassembly.