Parts for your 2020 Ford Fiesta-Camshaft sensor

2020 Ford Fiesta camshaft sensor — fitment, purpose, and servicing tips

Based on technical references including the Ford Workshop Manual for the Fiesta Mk8 (2017–2020), Ford ETIS/Motorcraft Service wiring diagrams, and third‑party data from Autodata and the Haynes Fiesta (2017‑on) manual, the 2020 Ford Fiesta is fitted with a camshaft position sensor (CMP). It’s a relevant, active engine management component on the 1.0 EcoBoost, 1.1 Ti‑VCT and 1.5 EcoBoost ST variants.

The camshaft sensor’s job is to let the powertrain control module know exactly where the camshaft(s) are in their rotation. That timing info is used for sequential fuel injection, spark timing and the Fiesta’s variable cam timing control. Paired with the crankshaft sensor, it helps the engine start quickly, run smoothly and deliver decent fuel economy without stumbles. On the 1.5L EcoBoost ST, accurate cam position data is crucial for the twin‑independent variable cam timing to hit its targets under load.

It’s not a regular “service item” like oil or filters, but it is worth a look during scheduled servicing. Techs typically check for stored fault codes, inspect the CMP harness for rubbing or heat damage, and make sure the sensor connector is clean and oil‑free. If there are symptoms, a scan tool and (ideally) an oscilloscope check the signal pattern against the workshop specs.

• Typical symptoms of a dodgy CMP: hard starting, rough idle, flat spots, misfires, poor fuel economy, or a check‑engine light with codes such as P0340/P0341 or cam/crank correlation faults.
• Causes can include internal sensor failure, wiring issues, oil intrusion at the connector, or metal debris at the sensor tip.

Replacement is straightforward for a trained tech: battery safe state, access the top/side of the cylinder head where the sensor sits, disconnect the plug, remove the retaining bolt, swap the O‑ringed sensor, then refit and tighten to the workshop‑specified torque. After replacement, clear codes and confirm live data. Some tools offer a cam/crank relearn—follow the service procedure if prompted. Using a quality OEM‑spec sensor helps avoid intermittent faults and saves a second trip back to the hoist.

There’s no set kilometre interval to replace a camshaft sensor on a 2020 Fiesta. Treat it as “inspect and test if symptoms show,” and keep the harness clips and engine covers in place so heat and vibration don’t shorten its life.

Popular questions about 2020 Ford Fiesta camshaft sensors

Where is the camshaft sensor on a 2020 Ford Fiesta?
On most 2020 Fiesta engines, the camshaft sensor is mounted on the cylinder head near the timing end of the engine, accessible from the top. Some variants may use more than one sensor for intake and exhaust cam monitoring.

Look for a small plastic sensor with a two‑ or three‑pin connector and a single retaining bolt. If access is tight, the engine cover may need to come off.

What fault codes point to a failing camshaft sensor?
Common codes include P0340 (Camshaft Position Circuit) and P0341 (Camshaft Position Range/Performance). You might also see cam/crank correlation codes if timing data doesn’t line up.

Before condemning the sensor, check wiring integrity, connectors and engine timing status. A good scan tool and guided tests from the Ford Workshop Manual make diagnosis quicker.

Should the camshaft sensor be replaced as routine maintenance?
No. It’s not a scheduled replacement item. It should be tested and replaced only if it shows faults or there are drivability symptoms tied to CMP operation.

During routine servicing, a quick visual inspection and a scan for stored or pending codes is all that’s normally required.