Parts for your 2008 Ford Falcon-Throttle position sensors

2008 Ford Falcon throttle position sensor (TPS): what it does and how to look after it

Based on technical references including the Ford FG Falcon Workshop Manual (Electronic Engine Controls), Ford Australia’s Microcat parts catalogue for FG throttle body assemblies, and industry guidance on electronic throttle control design, the 2008 Ford Falcon (FG series) uses an electronic throttle body with dual, integrated throttle position sensors (TPS1/TPS2). The TPS is not a separate bolt-on part, it’s built into the throttle body and works with the throttle motor and the PCM for drive-by-wire control.

On the 2008 Falcon, the TPS is the PCM’s eyes on the throttle blade. It constantly reports how far the blade is open so the engine can meter fuel, manage idle, and deliver smooth acceleration. The dual sensors inside the throttle body provide redundant signals, so the PCM can cross-check them for accuracy. If they don’t agree, the car may drop into limp mode to protect the engine and driver.

As part of regular servicing, it’s smart to keep the throttle body clean and the connector in good nick. Under the bonnet, check the throttle body for oil mist and carbon build-up, gentle cleaning of the blade and bore with throttle-body-safe cleaner can smooth out a rough idle. Never pry on the blade, and don’t try to open or “adjust” the sealed sensor housing — it’s factory-set. Also inspect the harness for rubbed insulation or loose pins, poor connections can mimic a failing TPS.

Common signs the TPS/throttle body needs attention include a hunting idle, flat spots on take-off, intermittent limp-home, or a check engine lamp with codes such as P0121–P0123 or P2135 (TP1/TP2 correlation), sometimes alongside throttle control codes (e.g., P2106). A scan tool can confirm live data: TP1 and TP2 should track smoothly and inversely in line with pedal movement.

If replacement is needed, the fix is to swap the complete throttle body assembly. Typical steps are:

• Disconnect battery, remove intake ducting, unplug the throttle connector.
• Unbolt the throttle body, fit a fresh gasket, torque to spec, refit ducting.
• Perform an idle/throttle relearn. Many FG Falcons self-learn after key cycles, a scan tool relearn is best practice. Allow a stable idle with accessories off, then on, and road test.

Done right, the Falcon’s electronic throttle and its built-in TPS deliver crisp response, stable idle, and reliable day-to-day motoring across Aussie and Kiwi conditions.

Popular questions

Does a 2008 Ford Falcon have a separate throttle position sensor?
It does have throttle position sensing, but it’s integrated into the electronic throttle body. On the FG, the TPS isn’t serviceable on its own, if it fails, the complete throttle body is replaced.

What symptoms and fault codes point to a TPS issue on an FG Falcon?
Expect erratic idle, hesitation, or limp mode. Common codes include P0121–P0123 and P2135 (TP correlation), sometimes with throttle control codes like P2106 or P2110. Live data should show smooth, matching TP1/TP2 signals as the throttle opens.

Is any calibration needed after changing the throttle body?
Yes. Many cars will self-learn after several key-on cycles and a stable idle period, but using a scan tool to run the throttle/idle relearn is recommended. Let it idle with accessories off, then with A/C on, and finish with a short drive.