Parts for your 2002 Ford Fiesta-Throttle position sensors

2002 Ford Fiesta throttle position sensor (TPS) — what it does and when to replace it

Based on Ford technical information (Ford TIS for Fiesta JH/JD, model years 2002–2008) and common service literature (Haynes Fiesta Petrol & Diesel 2002–2008 Manual No. 4183, Bosch Automotive Handbook), a throttle position sensor is fitted to 2002 Ford Fiesta petrol engines (Zetec-SE/Duratec 1.25, 1.4, 1.6) as part of the throttle body assembly. On the 1.4 TDCi diesel, a conventional TPS is not used for engine load control because diesels do not meter air with a throttle plate, instead they rely on an accelerator pedal position sensor and fuel quantity control, with any intake shut-off/throttle flap serving EGR/anti-shudder roles.

For petrol 2002 Fiestas, the TPS is a key input the engine control module relies on to understand driver demand. As the throttle plate opens and closes, the TPS reports position as a smooth voltage change, helping the ECU manage fuel delivery, ignition timing, idle speed control and decel fuel cut. When it’s behaving, the result is crisp throttle response, clean idling and decent fuel economy around town and on the open road.

It’s not a scheduled service item, but it’s worth inspecting during routine servicing if drivability isn’t quite right. Typical warning signs of a tired TPS include hesitations off the line, a hanging or hunting idle, flat spots on light throttle, or the check engine light with codes like P0120–P0124 or P2135. A quick scan tool check should show a steady sweep from roughly closed throttle to wide-open without drop-outs.

Replacement on cable-throttle Fiesta petrol models is usually straightforward: disconnect the battery, unplug the connector, remove the small mounting screws on the throttle body, swap the sensor, and refit. Most Fiesta TPS units are non-adjustable, so there’s no fiddly setup. After refitting, let the ECU relearn by idling the car from cold without accessories for a few minutes, then take it for a gentle drive with varied throttle. Always handle the connector carefully and avoid drowning the sensor in cleaners—if needed, use electrical contact cleaner on the plug only, and clean the throttle bore separately.

To maximise TPS life, keep the air filter fresh, ensure good engine and body earths, and fix any vacuum leaks promptly. If the car is a diesel TDCi, skip TPS shopping—look instead at the accelerator pedal sensor, MAF/EGR operation, or the intake shut-off valve if you’re chasing similar symptoms.

• Common symptoms: hesitation, unstable idle, poor economy, MIL on with TPS-related DTCs
• Good practice: check live data for smooth TPS sweep, inspect wiring/connector under the bonnet
• Diesel note: no conventional TPS, diagnostics focus on pedal sensor and air/fuel management

Popular questions about 2002 Ford Fiesta throttle position sensors

Does a 2002 Ford Fiesta have a TPS?

Yes, the petrol models do—mounted on the throttle body and read by the ECU to manage fueling and timing. The 1.4 TDCi diesel doesn’t use a conventional TPS for load control, it uses an accelerator pedal sensor and fuel quantity control, with any throttle flap used mainly for EGR/engine shutdown.

What are the signs the TPS is failing on a 2002 Fiesta?

Expect a hesitant take-off, flat spots during light acceleration, erratic idle, or the check engine light. A scan may show codes like P0120–P0124 or a jagged, inconsistent throttle percentage on live data.

Can a DIYer replace the TPS on a 2002 Fiesta petrol model?

Usually, yes. It’s a small bolt-on sensor at the throttle body. Disconnect the battery, unplug, swap, and refit. No special calibration is typically required, but perform an idle relearn and verify smooth operation with a scan tool afterwards.