Parts for your 1998 Ford Falcon-Camshaft sensor

1998 Ford Falcon camshaft sensor — what it does, where it is, and when to replace it

Based on factory workshop literature for the AU-series Falcon (EEC‑V management) and common parts catalogues used in Australia and New Zealand, the 1998 Ford Falcon with the 4.0L SOHC inline‑six is fitted with a dedicated camshaft position (CMP) sensor for sequential fuel injection and ignition synchronisation. Those same sources show that the AU‑series XR8 Windsor V8 of the period largely retained a distributor ignition and does not use a standalone CMP sensor. If you’ve got a 1998 AU 4.0L six, this page applies to you, if you’ve got a 5.0L V8, check your engine code and ignition layout before ordering a cam sensor.

On the 4.0L AU, the camshaft sensor lets the ECU know exactly which stroke each cylinder is on. That’s how it times sequential injection, trims fuelling, and improves cold starts. Paired with the crank sensor, it also helps the ECU spot misfires and keep the idle nice and tidy. When the CMP starts to go, you’ll usually see longer crank times, a stumble at idle, a drop in fuel economy, and often a check engine light with a cam signal fault.

There’s no scheduled replacement interval for the CMP on an AU Falcon, but it’s smart to eyeball it during regular servicing—particularly if the vehicle sees lots of heat or dusty work. Look for brittle wiring, oil contamination at the sensor body, loose mounting, or a cracked connector. If faults persist, scan for codes before throwing parts at it.

Replacement on the AU 4.0L is straightforward DIY for many owners, or a quick job for a workshop:

• Disconnect the battery and let the engine cool.
• Locate the sensor at the front/top area of the engine near the timing cover (access varies by model trim and accessories).
• Unplug the connector, remove the retaining fastener, and withdraw the sensor. Inspect the target/reluctor for damage.
• Install the new sensor with a fresh seal if required, route the loom away from heat, and torque the fastener to spec per the workshop manual.
• Clear any stored codes and road‑test. If a synchronisation procedure is specified in your service data, perform it with a scan tool.

Quality matters here—use a reputable OE‑equivalent sensor and keep the harness clips intact. A tidy installation prevents intermittent dropouts that can mimic fuel or ignition issues down the track.

Popular questions

Where is the camshaft sensor on a 1998 AU Falcon 4.0?
It’s typically mounted at the front of the engine near the timing cover/upper head area. Exact access can vary with accessories, but you’re looking for a small two‑ or three‑pin sensor with a single retaining bolt and a short loom.

What are common symptoms of a failing camshaft sensor on the AU six?
Long crank before it fires, rough idle, random stalling, hesitation off the line, poorer fuel economy, and a check engine light. A scan may show cam signal faults (e.g., CMP circuit/synchronisation) that come and go with heat or vibration.

Does the 1998 XR8 need a camshaft sensor?
Most AU‑series 5.0L Windsor V8s of this era run a distributor and don’t use a separate CMP sensor. If you’re unsure, check your ignition setup and VIN/engine code against a reputable parts catalogue or service manual before ordering.