Parts for your 2004 Ford Fiesta-Throttle position sensors

2004 Ford Fiesta throttle position sensors (TPS): what they do and how to look after them

Based on Ford’s TIS workshop information for Fiesta 2002–2008 models, the Haynes Ford Fiesta (’02–’08) manual, and Autodata service wiring/inputs for 2004 Fiesta engines (Duratec 1.25/1.4/1.6 petrol and TDCi), the 2004 Ford Fiesta does use throttle position sensing. Petrol variants have a TPS mounted on the throttle body. Some trims use an electronic throttle body (drive‑by‑wire) that incorporates two redundant TPS tracks inside the housing, while cable‑throttle cars use a separate bolt‑on TPS. Diesel variants rely on accelerator pedal position and a throttle flap position sensor, but workshop data still lists a throttle position input for engine control.

On a 2004 Fiesta, the throttle position sensor tells the engine computer exactly how far the throttle is open, so fueling and ignition timing match what the driver’s asking for. Whether it’s the separate sensor on a cable‑throttle setup or the dual‑track sensors inside an electronic throttle body, it’s a key input for smooth idle, clean take‑off, and decent fuel economy.

When a TPS plays up, the Fiesta can feel hesitant, surge at a steady speed, idle roughly, or light the check engine lamp. Common fault codes include P0120–P0124 and P0220–P0229. Before throwing parts at it, it’s worth checking the basics: make sure the throttle body isn’t gummed up, the connector is seated firmly, and the wiring insulation near the plug hasn’t gone brittle.

• Service tip: clean the throttle body with proper throttle cleaner, not carb cleaner on coated throttles.
• Electrical check: with a scan tool, look for a smooth TPS voltage/signal sweep from closed to wide‑open throttle.
• Relearn: many Fiestas need an idle/throttle relearn after replacement or battery disconnect. A short drive cycle or a scan‑tool routine usually does it.

Replacing a separate, bolt‑on TPS is a straightforward job: disconnect the battery, unplug the sensor, remove the two screws, fit the new sensor, and don’t over‑tighten. On electronic throttle bodies, the TPS is built in, the fix is to replace the whole unit, then carry out an adaptation. In both cases, use quality parts and keep the connector clean and dry. During regular servicing, a quick visual of the harness and a throttle body clean every 40–60,000 km helps prevent weird drivability gremlins.

Where is the TPS on a 2004 Fiesta?

On cable‑throttle petrol models, it’s a small black sensor on the side of the throttle body, opposite the cable linkage. On drive‑by‑wire variants, it’s integrated inside the electronic throttle body. Diesel models monitor throttle flap and pedal position rather than a standalone TPS.

Do you need to program or relearn after changing the TPS?

Often, yes. Many Fiestas require a throttle/idle adaptation after TPS or throttle body work. Some will relearn after a short drive with varied throttle, others benefit from a scan‑tool routine to set the minimum throttle and idle targets.

What fault codes point to a TPS issue?

Look for P0120–P0124 (TPS circuit range/performance, low/high, or intermittent) and P0220–P0229 on drive‑by‑wire systems. Pair those with symptoms like stumble off idle or erratic idle to zero in on the TPS and its wiring.