Parts for your 2008 Nissan Primera-Throttle position sensors

2008 Nissan Primera throttle position sensor — purpose, care, and when to replace

Yes, the 2008-registered Nissan Primera (P12 series) uses a throttle position sensor — in fact, a pair of sensors integrated into the electronic throttle body. Nissan’s own Electronic Service Manual for the P12 (EC section) describes a drive‑by‑wire throttle with dual-track throttle position sensing and an accelerator pedal position sensor, and aftermarket data providers such as Autodata and Bosch’s technical texts outline the same arrangement for late‑model Nissan petrol and diesel engines. While many markets ended Primera production around 2007, vehicles first registered in 2008 use the same setup.

On this Primera, the throttle position sensors (TPS) sit inside the throttle body and constantly report the exact opening angle of the throttle plate. The engine control module cross‑checks these signals with the pedal sensor to serve up smooth acceleration, tidy idle control, better fuel economy and emissions compliance. Because they’re dual sensors, the ECU can compare both tracks for safety, if they disagree, the car can drop into limp mode to protect the engine and occupants.

Typical warning signs of TPS trouble include a lit check engine light, rough or hunting idle, flat spots, throttle lag, stalling, poor economy, or codes like P0120–P0123 and P2135. On the P12, the TPS isn’t a separate bolt‑on switch — it’s part of the throttle body assembly. If the sensors fail, the fix is usually a complete throttle body replacement rather than just swapping a small sensor.

• During servicing, avoid forcing the throttle plate open by hand, that can damage the gears and sensors.
• Clean light carbon from the throttle bore with a proper throttle‑body cleaner and a soft cloth. Keep solvent away from electronics and don’t soak it.
• Check the connector and earths for corrosion. With a scan tool, confirm TP1/TP2 signals track smoothly and agree through the full range.
• After cleaning or replacing the throttle body, perform throttle closed‑position and idle air volume learn procedures using a scan tool (CONSULT or equivalent) or the approved pedal/key sequence.
• Replace the throttle body gasket, torque fasteners correctly, and ensure stable battery voltage during relearn.
• Diesel variants (like YD22) also use an electronically actuated intake throttle for EGR/anti‑shudder, with its own position sensing — same care applies.

There isn’t a fixed replacement interval for the TPS on a Primera, it’s condition‑based. If faults persist after cleaning and checks, fit a quality throttle body assembly and carry out the relearn. That’ll keep the Primera feeling crisp around town and relaxed on the open road across NZ and Australia.

Popular questions about 2008 Nissan Primera throttle position sensors

Q1: Does a 2008 Nissan Primera have a separate throttle position sensor I can replace?
Most P12 Primeras don’t. The TPS is built into the electronic throttle body as dual sensors. If the TPS fails, the usual remedy is to replace the entire throttle body. Earlier cable‑throttle models (older P11s) used a separate sensor, but that doesn’t apply to the 2008‑registered P12.

Q2: Do I need to perform a relearn after cleaning or replacing the throttle body?
Yes. After any throttle body work, the ECU needs closed‑throttle and idle air volume learn procedures. Use a scan tool (ideal) or the approved Nissan pedal/key sequence. Skipping this can leave the idle high, low, or unstable.

Q3: What fault codes point to a bad TPS on a Primera?
Common codes include P0120–P0123 (TPS circuit range/performance) and P2135 (TPS A/B correlation). These may come with limp mode, poor response, or a stubborn idle. Always check wiring and connector integrity before condemning the throttle body.