Parts for your 2007 Toyota Bb-Throttle position sensors

2007 Toyota bB Throttle Position Sensor — What It Does and How to Look After It

Technical references from Toyota’s service information (TIS) for the QNC20/QNC21 bB, along with the factory engine manuals for the 1NZ‑FE and 2SZ‑FE, show an electronically controlled throttle body that incorporates dual throttle position sensors (VTA/VTA2). Toyota’s diagnostic coverage for this model also includes TPS and accelerator pedal sensor codes (for example P0120–P0124 and P0220–P0222), confirming the sensor is fitted and monitored. So yes, the 2007 Toyota bB uses a throttle position sensor.

On the 2007 Toyota bB, the throttle position sensor (TPS) tells the engine computer exactly how far the throttle plate is open. That information is crucial for fuelling, ignition timing, transmission shift behaviour, idle control, cruise, and stability systems. In this generation, the TPS is built into the electronic throttle body as a pair of sensors that the ECU cross‑checks, so accuracy and clean signals are the name of the game.

There’s no routine replacement interval for the TPS, but it benefits from sensible servicing. At regular services (say every 40,000–60,000 km), it’s smart to clean the throttle body bore and plate with an approved throttle cleaner, check the electrical connector for corrosion, and inspect the wiring harness where it bends near the throttle body. Because the TPS is integrated, heavy‑handed cleaning or forcing the throttle plate by hand can damage the sensor tracks or the drive gears—so go gentle and avoid soaking the motor housing.

If the bB starts to idle roughly, hesitates off the mark, chews through more fuel than normal, or throws a Check Engine lamp with reduced power, the TPS/throttle body should be scanned. A proper scan tool will show the two throttle angle signals tracking together and within range, any mismatch or dead spots will usually set a fault code and may trigger limp mode.

• Common clues: unstable idle, flat spots on light throttle, delayed kickdown, and DTCs for throttle/pedal position.
• Replacement: the TPS is part of the throttle body assembly, so the whole unit is typically replaced. Always fit a new gasket, torque the fasteners evenly, and check for vacuum leaks after refit.
• Relearn: after cleaning or replacement, perform throttle/idle learn with a capable scan tool, following the Toyota procedure, so the ECU knows the new closed and open positions.

Look after the throttle body and its sensors, and the bB will deliver smooth, predictable response around town and on the open road.

Popular questions about 2007 Toyota bB throttle position sensors

How can someone tell if the TPS is failing on a 2007 bB?
They’ll often notice a rough or hunting idle, hesitation when taking off, poor fuel economy, or a Check Engine light. A scan tool can confirm by showing erratic or mismatched throttle angle signals from the two TPS tracks, and will usually log a related DTC. If symptoms change when lightly tapping the throttle body or wiggling the connector, that’s another giveaway.

Can the TPS be replaced on its own, or is it part of the throttle body?
On this model the TPS is integrated into the electronic throttle body. Toyota supplies the assembly as a single unit, so typical repair practice is to replace the whole throttle body. That ensures the dual sensors and the motor are matched and reliable, and it avoids calibration issues that can crop up with piecemeal swaps.

Does the TPS need calibration after replacement?
Yes—after fitting a new throttle body or doing heavy cleaning, a throttle/idle learn should be carried out. A capable scan tool makes this straightforward and follows Toyota’s specified procedure. Skipping the learn can leave the idle off‑spec or trigger further fault codes, so it’s worth doing right away.