Parts for your 2018 Ford Fiesta-Camshaft sensor

2018 Ford Fiesta camshaft sensor — purpose, servicing and replacement

Yes, the 2018 Ford Fiesta is fitted with a camshaft position (CMP) sensor (in some engine variants there are two). This is documented in Ford’s Workshop Manual (WSM) for the Fiesta, Section 303-14 Electronic Engine Controls, which includes “Camshaft Position (CMP) Sensor — Removal and Installation” procedures for common 2018 engines such as the 1.0L EcoBoost and Ti‑VCT petrols. The Ford Powertrain Control/Emissions Diagnosis (PC/ED) manual also provides pinpoint tests for DTCs like P0340/P0341 specifically related to the CMP circuit, confirming its use. Motorcraft parts catalogues list CMP sensors against 2018 Fiesta VIN ranges, and trade databases such as Autodata/AllData carry Fiesta CMP test and replacement procedures. Taken together, these technical sources make it clear the camshaft sensor is relevant and used on the 2018 Fiesta.

What does it do? The CMP sensor tracks the camshaft’s position so the PCM can sync sequential fuel injection, run variable cam timing (Ti‑VCT), optimise spark, and speed up starts. If the PCM loses the cam signal, it may fall back to crank-only operation with reduced power and economy, and it’ll likely switch on the MIL. On some Fiesta engines, there’s a CMP for each cam to support dual independent VCT.

Typical symptoms of a dodgy CMP sensor or wiring include:

• Hard starting, misfires, rough idle, or hesitation under load
• Sluggish performance and higher fuel use
• Check Engine lamp with codes like P0340, P0341, P0365, or related correlation faults

Servicing advice for owners in AU/NZ: the CMP sensor isn’t a scheduled replacement item, but it should be checked during diagnostics for driveability complaints. Oil intrusion in the connector, damaged wiring near the rocker cover, or a brittle O‑ring are common findings. Replacement is straightforward on most 2018 Fiesta engines:

1. Let the engine cool, disconnect the battery if required by workshop policy.
2. Remove the engine cover for access under the bonnet.
3. Unplug the CMP connector and release the harness clip(s).
4. Remove the retaining bolt, withdraw the sensor, and inspect the O‑ring.
5. Lightly oil a new O‑ring, install the new OE‑quality sensor, and refit the bolt (tighten to the spec in the WSM).
6. Reconnect, clear DTCs, and perform a short drive cycle so the PCM can relearn.

Good practice is to verify power/ground/signal with a scope or scan tool before condemning the sensor, as wiring faults are common. Stick with OEM or reputable aftermarket parts, and keep the connector clean and latched—moisture and vibration are the usual culprits over the kilometres.

Where is the camshaft sensor on a 2018 Fiesta?

It’s typically mounted at the end of the cylinder head near the cam cover. On many 1.0L EcoBoost models it’s on the top or gearbox end of the head, some variants have one sensor per cam. A quick look under the engine cover will reveal a small, single-bolt sensor with a two- or three-pin plug.

Can someone keep driving with a faulty camshaft sensor?

Often the car will still run, but it may start poorly, feel flat, and chew more fuel. It can also stall and trigger the MIL. Best bet in Australia or New Zealand is to get it scanned and sorted promptly—prolonged driving can mask other timing or wiring issues.

Does a new camshaft sensor need programming?

No special programming is normally required. After fitting, clear any fault codes and take a short drive so the PCM relearns. Some techs perform a KAM reset with a scan tool to speed things up, but it isn’t mandatory.