Parts for your 2003 Ford Falcon-Camshaft sensor

2003 Ford Falcon camshaft sensor — what it does and when to replace it

Based on technical references including the Ford BA Falcon Workshop Manual (Engine Management/Control Systems), the BA-series Electrical Wiring Diagram, and common Australian parts catalogues for the 2002–2005 BA range, the 2003 Ford Falcon (Barra 4.0 inline‑six and Boss 5.4 V8) is equipped with a camshaft position (CMP) sensor. These sources identify the CMP sensor as a key input for sequential fuel injection and variable cam timing control.

On a 2003 Falcon, the camshaft sensor tells the engine computer exactly where the cam is in its rotation, so it can phase fuel injection and spark properly, pick the right moment for VCT adjustments, and speed up starts. The inline‑six typically has the sensor mounted at the front of the cylinder head near the timing cover, while V8 models use sensors at the front of each bank. Without a clean, reliable CMP signal, the car may revert to a backup strategy that cranks longer, runs rough, or drops power.

It’s not a scheduled service item, but it does pay to give it a look during routine servicing—especially on higher‑kilometre cars. Under the bonnet, check the connector for oil wicking from a rocker cover weep, inspect the wiring conduit for brittleness or rub‑through near the front of the head, and make sure the sensor’s O‑ring isn’t weeping.

• Common symptoms of a tired or failed CMP: longer crank/reluctant start, intermittent misfire at low rpm, poor fuel economy, VCT behaving oddly, or the MIL on with codes like P0340/P0341.
• Quick checks: scan for codes and live data, wiggle‑test the harness, and look for metallic debris or oil contamination around the sensor face.

Replacement is straightforward for a competent DIYer: disconnect the battery, release the plug, remove the retaining fastener, swap the sensor with a quality unit (new O‑ring lightly oiled), and refit. Route the loom away from hot or sharp edges and secure it properly. No special relearn is normally required, the ECU will synchronise on first start. Clear any stored faults, let it idle to a steady temperature, and take it for a relaxed road test to confirm clean starts and stable idle. If issues persist after replacement, consider checking the crank sensor signal, timing integrity, and earthing points, as those can mimic CMP faults on BA models.

For best results, stick with reputable brands and follow torque guidance in the Ford workshop manual. A few extra minutes on wiring care under the bonnet will help the sensor last the distance.

Popular questions

Where is the camshaft sensor on a 2003 Ford Falcon?
On the Barra 4.0 inline‑six, it’s typically at the front of the cylinder head near the timing cover and VCT hardware. On the Boss 5.4 V8, there’s a sensor at the front of each cylinder bank. Access is under the bonnet at the front of the engine, remove covers as needed for a clear run at the retaining bolt and plug.

What fault codes point to a bad camshaft sensor on a BA Falcon?
Common OBD‑II codes include P0340 (camshaft position sensor circuit) and P0341 (range/performance). Drivers often notice longer cranking, uneven idle, or the car feeling flat. Always verify power, ground, and signal integrity to the sensor before calling the part.

Does a 2003 Falcon need a relearn after replacing the camshaft sensor?
Generally, no. The PCM will resynchronise on start‑up. Clear codes, start the engine, let it idle until warm, and take a short drive. If the light returns, double‑check the connector, loom routing, and sensor seating, and scan live data to confirm a clean cam signal.