Parts for your 2020 Ford Focus-Throttle position sensors

2020 Ford Focus throttle position sensor (TPS)

Based on Ford’s Workshop Manual for Focus 2019–2021 (Section 303-14, Electronic Engine Controls), Motorcraft service wiring diagrams, and the Ford DTC catalogue that lists TP1/TP2-related codes (P0121–P0124, P2135), the 2020 Ford Focus does use a throttle position sensor. It’s built into the electronic throttle body (ETB) alongside the throttle actuator motor, rather than being a separate bolt-on sensor.

On the 2020 Focus, the TPS has a simple but critical job: it continuously tells the engine control module exactly how far the throttle plate is open. In a modern drive-by-wire setup, the car reads the accelerator pedal position sensor (at the pedal) and then moves the throttle plate using an electric motor. The integrated dual-track TPS (often labelled TP1/TP2 in Ford literature) provides two independent signals so the ECU can cross-check them for safety, keeping the idle smooth and the power delivery crisp while controlling emissions and fuel economy.

When the TPS inside the throttle body goes out of spec or its connector/wiring plays up, drivers might notice rough idle, hesitation, poor fuel economy, or a “limp home” mode. Fault codes commonly seen include P0121, P0122, P0123, P2135 and related ETB codes flagged by the Ford workshop manual and Motorcraft diagnostics.

• There’s no separate TPS to swap on this model — replacement means fitting a complete throttle body assembly that includes the sensor and actuator.
• Before replacing, rule out basics: clean the throttle bore and plate with proper throttle body cleaner, check the air filter, and inspect the ETB connector and loom for corrosion or broken pins.
• If a new throttle body is fitted, perform the correct throttle/idle learn. Ford service info specifies an idle relearn/adaptation using a scan tool, or a key-on/engine-off procedure followed by a drive cycle.
• Don’t force the throttle plate open by hand. That can damage the gearset or sensor tracks.
• Use a new gasket and tighten mounting bolts to the workshop manual spec. Clear DTCs and confirm live data for TP1/TP2 tracks aligns and rises smoothly.

As part of routine servicing, keeping the intake tract clean and the battery and grounds healthy goes a long way. Many workshops in Australia and New Zealand recommend inspecting and, if needed, cleaning the throttle body around 60,000–90,000 kilometres, especially if most driving is stop–start under the bonnet heat.

When in doubt, a proper scan of throttle data and fault memory is the fastest way to sort a niggly Focus throttle.

FAQs

Does a 2020 Ford Focus have a throttle position sensor?
Yes. Ford integrates dual throttle position sensors (TP1/TP2) into the electronic throttle body on the 2020 Focus. It’s not a separate, serviceable sensor, if the TPS fails, the throttle body assembly is replaced. The car also has an accelerator pedal position sensor at the pedal — different part, different job.

Do you need to program or relearn anything after replacing the throttle body?
You do. After fitting the new unit, perform the throttle/idle learn. Ford’s service procedures call for an adaptation routine via a scan tool, or a structured key-on and drive cycle so the ECU can relearn the throttle plate position. Skipping this can leave the idle high, low, or unstable.

How often should the TPS or throttle body be serviced?
The TPS itself isn’t a scheduled replacement item. However, inspecting and cleaning the throttle body around 60,000–90,000 kilometres is smart, especially if there’s a sticky idle. Always use throttle-safe cleaner and avoid moving the plate by hand.