Parts for your 2008 Nissan Serena-Throttle position sensors

2008 Nissan Serena Throttle Position Sensors

Yes, the 2008 Nissan Serena (C25 series, typically with the MR20DE petrol engine) uses a throttle position sensor. Nissan’s factory service information for the C25 Serena lists an electronic throttle control system where the throttle position sensor is built into the throttle body assembly alongside the throttle control motor. The accelerator pedal also carries its own position sensor. So a throttle position sensor is very much relevant on this model, even if it isn’t a separate bolt-on sensor. Technical references: Nissan C25 Serena Service Manual – Engine Control (EC) section for MR20DE, and Nissan parts catalogues that show the TPS integrated with the throttle body.

On this Serena, the throttle position sensor (TPS) tells the engine control unit how far the throttle plate is open. Because it’s a drive‑by‑wire setup, there’s no cable from the pedal, instead, the ECU blends input from the accelerator pedal sensor with the TPS to command the throttle motor. The result is smoother response, better fuel economy, and stable idle control when the air con or electrical load kicks in.

As part of routine servicing, the TPS itself doesn’t need periodic replacement. What helps is keeping the throttle body clean. A sticky plate can confuse the sensor readings and cause a rough idle, surging, poor take‑off, or a check engine light with codes like P0120–P0123 or P2135. If cleaning is needed, use throttle‑body safe cleaner, avoid drowning the electronics, and fit a new gasket if the body is removed.

Important: on these Nissans, any throttle body clean or replacement usually needs a relearn. A capable scan tool (CONSULT‑III or equivalent) can run Accelerator Pedal Released Position Learning, Throttle Valve Closed Position Learning, and Idle Air Volume Learning. Skipping this can leave the Serena idling high, stalling, or stuck in limp mode.

If the TPS fails, it’s typically replaced with the entire throttle body assembly because the sensor is integrated and not serviceable on its own. Choose quality OEM or reputable aftermarket units, clear the fault memory, and complete the relearn procedures. Regular air filter changes and fixing vacuum leaks will also keep the TPS readings stable and the Serena running sweet.

• Common signs of TPS/throttle body trouble: erratic idle, hesitation, poor fuel economy, limp mode, and related fault codes.
• Best practice after service: perform throttle/pedal relearns with a proper scan tool to restore correct idle and response.

Popular questions about 2008 Nissan Serena throttle position sensors

Does a 2008 Nissan Serena actually have a throttle position sensor?
It does. The C25 Serena’s TPS is built into the electronic throttle body, working with the throttle motor to report plate angle to the ECU. There’s also an accelerator pedal position sensor at the pedal.

Can the TPS be replaced on its own, or does the whole throttle body need changing?
On this model, the TPS isn’t a separate service part. If the sensor fails or goes out of range, the usual repair is to replace the complete throttle body assembly, then carry out the required relearn procedures.

Do I need an idle relearn after cleaning or replacing the throttle body?
Yes. After cleaning or fitting a new unit, run the throttle/pedal/idle relearns with a suitable scan tool. This restores correct closed‑throttle and idle values so the Serena idles and drives properly.