Parts for your 2007 Holden Astra-Throttle position sensors

2007 Holden Astra throttle position sensor: what it does, why it matters, and how to look after it

Technical sources for the Astra AH platform (Holden/Opel Service Information in GlobalTIS/SI for MY2004–2009, plus Bosch Motronic ME7.6.x engine management references) confirm the 2007 Holden Astra runs electronic throttle control. That means it absolutely uses throttle position sensors (TPS) – in fact, dual redundant TPS tracks built into the motorised throttle body – and a separate dual-track accelerator pedal position sensor. It’s not a cable throttle, so throttle angle is measured and driven electronically.

On the Z16XER and Z18XER petrol engines (and performance/turbo variants), the ECU constantly compares the two TPS signals to know the exact blade angle, manage idle speed, fuel and spark, and keep emissions tidy. If the two signals don’t agree, the ECU throws a fault and drops the car into reduced-power mode to keep things safe. This dual-track setup is documented in GM SI/GlobalTIS and typical Bosch electronic throttle specs for the Astra H era.

What does a driver notice when the TPS or its wiring plays up? Common signs are erratic idle, hunting revs, flat spots, a flashing spanner or MIL, and limp-home behaviour. OBD-II codes often logged include P0120–P0124, P0220, P2135 and related throttle actuator faults. The Holden/Opel service literature also notes correlation checks between the pedal and throttle sensors, if these drift, it’ll fault out quickly.

Servicing-wise, the TPS on a 2007 Astra isn’t a stand-alone, serviceable piece. It’s integrated into the throttle body, so the approved fix is to replace the throttle body assembly if the sensor is faulty. A clean throttle plate can help drivability, but keep solvent away from the electronics and don’t force the blade by hand.

• Before replacing, inspect the connector and harness for oil ingress or broken wires.
• If cleaning the throttle, use throttle-safe cleaner sparingly and let it dry fully.
• After battery disconnect or throttle body replacement, perform a throttle/idle learn with a scan tool (Tech 2/GDS). Some vehicles will relearn after a short idle warm-up, but the tool procedure is the reliable method per GM SI.
• Fit a new gasket or O-ring where applicable and tighten fasteners to manufacturer spec.
• If faults persist, check ECU updates in GM service info and verify pedal sensor correlation.

Bottom line from the factory info: the TPS is essential on this Astra, it’s built into the electronic throttle body, and correct diagnosis plus a proper relearn are the key steps to a lasting fix.

FAQs

Does a 2007 Holden Astra have a throttle position sensor?
Yes. The 2007 Astra (AH) uses electronic throttle control with dual throttle position sensors inside the throttle body, and a separate dual-track accelerator pedal sensor. This architecture is outlined in Holden/Opel GlobalTIS/Service Information for Astra AH and in Bosch ME7.6.x system documentation.

Can the TPS be replaced on its own?
Not typically. On the Astra AH petrol engines the TPS is integral to the motorised throttle body and isn’t serviced separately. If the TPS fails correlation or has dead spots, the OE remedy is replacing the complete throttle body and performing a throttle/idle learn with a scan tool.

What fault codes point to a TPS issue on a 2007 Astra?
Common codes include P0120–P0124 (TPS circuit range/performance), P0220 (TPS 2), P2135 (TPS 1–2 correlation), and related throttle actuator faults. Symptoms often include limp mode, erratic idle and a spanner/MIL light. Always verify wiring and connectors before condemning the throttle body.