Parts for your 2020 Nissan Serena-Throttle position sensors

2020 Nissan Serena throttle position sensors (TPS): what they do and how to look after them

Based on Nissan’s C27 Serena service manual (Engine Control “EC” section) and Nissan parts catalogues for both MR20DD (S-HYBRID) and e-POWER variants, the 2020 Serena uses electronic throttle control with dual throttle position sensors integrated into the throttle body assembly. The TPS is not a separate, serviceable part, it’s built into the electronic throttle actuator and monitored redundantly (TP1/TP2). Related Nissan diagnostic items include DTCs such as P0121, P0122, P0123, P0221 and throttle relearn procedures via CONSULT.

On the 2020 Nissan Serena, the throttle position sensors are the electronic eyes that tell the engine computer exactly how far the throttle plate is open. Because the Serena runs drive-by-wire, the throttle body houses an electric motor and twin TPS tracks for safety. The ECU constantly cross-checks those signals to deliver smooth response, stable idle and proper emissions—whether it’s the MR20DD petrol in the S-HYBRID or the generator engine in the e-POWER model.

There’s no scheduled replacement interval for the TPS, and you can’t swap the sensor by itself—it’s integrated with the throttle body. During regular servicing, a technician will typically inspect the intake ducting and connector, check for fault codes and, where appropriate, clean light deposits in the throttle bore using the correct throttle-body-safe cleaner. A couple of good rules: don’t force the throttle plate open by hand, keep the battery voltage healthy during any checks, and avoid soaking the electronics. If the throttle body is replaced or heavily cleaned, an idle air volume learn/throttle relearn via a scan tool (Nissan CONSULT or equivalent) is often required to settle the idle.

Tell-tale signs the TPS/throttle body needs attention include a rough or high idle, hesitant take-off, sudden limp mode, surging at steady speed, or multiple warning lamps (engine/traction) paired with P012x/P022x codes. If replacement is needed, the whole throttle body assembly is fitted with a new gasket, fasteners torqued to spec, electrical connector seated cleanly, and a relearn carried out. Most owners won’t need this job within typical Kiwi or Aussie driving, but around the 100,000–150,000 kilometre mark it’s smart to have the intake and throttle body condition checked, especially if the vehicle has seen lots of short trips or dusty roads.

• Keep air filter and intake plumbing in good nick to minimise throttle deposits.
• Scan for faults before parts swapping, many issues are wiring or ground related.
• After any throttle work, perform the proper relearn so idle and response are spot on.

Popular questions about 2020 Nissan Serena throttle position sensors

Does the 2020 Serena actually have a throttle position sensor?
Yes. The C27 Serena uses an electronic throttle body with dual, built-in TPS tracks. It’s part of the throttle actuator, not a separate bolt-on sensor.

Can the TPS be cleaned or replaced on its own?
No. The TPS is integrated into the throttle body and isn’t serviceable separately. Light cleaning of the throttle bore is fine when done correctly, if the sensor fails, the complete throttle body is replaced and a relearn is performed.

What symptoms point to a TPS/throttle body issue?
Common clues include unstable idle, poor throttle response, limp mode, and engine light with codes like P0121–P0123 or P0221. Always check connectors and wiring before condemning the unit.