Parts for your 2020 Ford Focus-Crank angle sensor

2020 Ford Focus crank angle sensor (crankshaft position sensor)

Yes, the 2020 Ford Focus is fitted with a crank angle sensor—commonly called the crankshaft position (CKP) sensor. Ford’s Focus (C519 platform) workshop manual for 2019–2021 models details the CKP sensor across the EcoBoost and EcoBlue engines, and Motorcraft wiring diagrams show the CKP as a primary input to the PCM. Bosch’s Automotive Handbook explains why modern sequential injection and ignition need CKP data, and OBD-II/Euro 6 misfire monitoring (as defined in SAE J1979/J2012) also depends on it. So it’s absolutely relevant on the 2020 Focus.

The CKP sensor reads a toothed wheel on the crank to tell the ECU exactly where the pistons are and how fast they’re spinning. That lets the car fire injectors and coils at the right moment, trim fuel on the fly, and detect misfires. Without a clean signal, the Focus may crank longer, run roughly, stall at lights, or not start at all. The check engine light and codes like P0335–P0339 are common when the signal goes missing.

There’s no scheduled replacement interval for the CKP on a 2020 Focus, so it’s a “fit and forget” item unless symptoms show up. As part of routine servicing, a quick look under the bonnet for oil seepage on the sensor area, brittle wiring, or a loose connector is worth doing—especially around the bellhousing where heat and road grime collect. Keeping the harness clipped away from the driveshaft and exhaust helps prevent intermittent faults.

If replacement’s on the cards, a quality OE-spec sensor is the go. Typical steps are:

• Disconnect the battery negative.
• Access the sensor at the rear of the engine by the transmission bellhousing (location varies slightly by engine).
• Remove the single retaining bolt, clean the mounting face, and lightly oil a new O-ring if fitted.
• Refit, route the loom correctly, reconnect, clear codes, and perform a crankshaft relearn with a scan tool if available. Many Focus models will self-learn after a few drive cycles, but a proper relearn gives the smoothest result.

Common signs it’s playing up include hard starting when warm, sudden cut-outs, tachometer dropouts, and random misfire counts. Before condemning the sensor, check battery health and grounds—low voltage can mimic a bad CKP signal.

Popular questions

Where is the crank angle sensor on a 2020 Ford Focus?
On most 1.0 and 1.5 EcoBoost models it’s mounted low at the rear of the engine, reading the flywheel/flexplate through the transmission bellhousing. Access is typically from underneath with the splash shield removed.

Does a new CKP sensor need programming?
There’s no coding, but a crankshaft position relearn via a scan tool is recommended. If that’s not done, the ECU usually adapts after a few warm-up cycles and kilometres of normal driving.

What does replacement usually cost?
In Australia and New Zealand, parts typically run about $60–$180 for a quality sensor, with 0.5–1.0 hours labour. Drive-away pricing often lands in the $180–$400 range depending on engine and workshop rates.