Parts for your 2018 Nissan Pathfinder-Throttle position sensors

2018 Nissan Pathfinder throttle position sensor: fitted, what it does, and how to look after it

Yes, the 2018 Nissan Pathfinder (R52, VQ35DD) uses a throttle position sensor, and it’s built into the electronic throttle body. This is confirmed by Nissan’s Electronic/Factory Service Manual for the 2018 Pathfinder in the EC (Engine Control) section under Electronic Throttle Control, which details dual throttle position sensors inside the throttle control actuator. Nissan’s parts catalogues list the sensor as part of the throttle body assembly (non‑serviceable separately). Common OBD‑II diagnostics for this model include TPS‑related codes like P0121–P0123 and P2135, further showing the system is in play on this vehicle.

On this Pathfinder, the throttle position sensors (there are two for redundancy) tell the engine computer exactly how far the throttle plate is open. That data is matched against the accelerator pedal sensor to deliver smooth, safe “drive‑by‑wire” throttle. It’s a small job with a big impact: crisp response, stable idle, good fuel economy, and proper emissions control all depend on accurate throttle angle feedback.

Because the TPS is integrated into the throttle body, routine servicing focuses on keeping the assembly clean and calibrated rather than swapping the sensor. During scheduled maintenance, it’s smart to:

• Inspect for intake leaks and excessive carbon at the throttle plate, especially every 60,000–90,000 kilometres or sooner in dusty stop‑start use.
• Clean the throttle bore and plate with throttle‑body‑safe cleaner (don’t force the plate open by hand).
• Scan live data to compare accelerator pedal and throttle angle, check for stored or pending TPS‑related DTCs.
• Perform Nissan’s relearn procedures after cleaning or replacement: Throttle Valve Closed Position, Accelerator Pedal Released Position, and Idle Air Volume Learn (via CONSULT or the manual sequence).

If the TPS fails or shows mismatched signals, the fix is to replace the complete throttle body, fit a new gasket, torque to spec, and carry out the relearns. Symptoms can include erratic idle, hesitation, reduced power/limp mode, and the MIL on with codes such as P0121, P0122, P0123, or P2135. Given the integration, owners should budget for a full throttle body rather than a stand‑alone sensor, and have the job completed with the correct learning procedures to avoid rough idle or stalling.

For technicians and owners alike, following the Nissan service manual guidance and using a capable scan tool keeps the 2018 Pathfinder’s electronic throttle system behaving as it should under the bonnet.

Does the 2018 Pathfinder actually have a throttle position sensor?

It does. The model uses an electronic throttle body with dual built‑in throttle position sensors. Nissan’s 2018 Pathfinder service manual (R52, EC section) identifies these sensors as part of the throttle control actuator, and the parts listings show they’re not sold separately from the throttle body.

What are common signs the TPS/throttle body is playing up?

Owners may notice rough or hunting idle, a flat spot or hesitation on take‑off, reduced power (limp mode), poor fuel economy, or the check‑engine light. Scan tools often reveal codes like P0121–P0123 or P2135, and live data may show throttle angle that doesn’t track the accelerator pedal smoothly.

Can the TPS be replaced on its own on a 2018 Pathfinder?

No. On this model, the TPS is integrated into the throttle body. If the sensor is faulty, the remedy is to replace the complete throttle body assembly, fit a new gasket, and perform the throttle/idle relearn procedures so the ECM can set the correct positions.