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Infiniti Qx4 Throttle Position Sensors

Infiniti Qx4 Throttle position sensors

Starting at low prices, AutoBuffy stocks multiple throttle position sensors for the Infiniti Qx4 from trusted brands including top OE-quality brands. The throttle position sensor (TPS) tells the engine control module exactly how far the throttle plate is open, so the ECM can meter fuel and timing correctly. A failing TPS causes rough running, hesitation, and poor fuel economy that won't fix itself.

Signs your Infiniti Qx4 needs a new throttle position sensor

  • Hesitation or stumbling when you press the accelerator from a stop or during light throttle transitions
  • Erratic or hunting idle — the engine rpm surges and drops unpredictably at a standstill
  • Check Engine light with TPS-related codes such as P0120–P0124 or P0220–P0224
  • Poor fuel economy that appears suddenly without any other obvious cause
  • Transmission shifting at the wrong time or refusing to upshift smoothly due to incorrect throttle load signal
  • Engine goes into limp mode, limiting vehicle to low speed and cutting power to protect the drivetrain

Which throttle position sensor should you buy for your Infiniti Qx4?

The main decision is whether to buy an OEM-equivalent direct-fit sensor or an adjustable aftermarket unit, and whether your Infiniti Qx4 uses a single-position or dual-track (redundant signal) sensor. Some platforms integrate the TPS into a throttle body assembly, making a standalone sensor unavailable — confirm your application before ordering.

OEM-Equivalent Direct-Fit
Best for
Drivers who want a plug-and-play replacement with no calibration
What you get
Exact resistance curve and connector match; no adjustment required after installation
Adjustable Aftermarket TPS
Best for
Older throttle bodies where the sensor mounts with slotted screws and voltage must be set
What you get
Wider compatibility across model years; requires a multimeter and idle voltage adjustment during install
Dual-Track / Redundant Sensor
Best for
Vehicles with drive-by-wire systems that require two independent signal circuits for safety
What you get
Meets OEM redundancy specs; incorrect substitution with a single-track unit will set faults immediately
Integrated Throttle Body Assembly
Best for
Cases where the sensor is non-serviceable or the throttle body bore is worn or dirty beyond cleaning
What you get
Complete unit with fresh sensor, bore, and blade; eliminates multiple failure points at once

Replacing a throttle position sensor on a Infiniti Qx4

Easy⏱ 30–60 minutesMultimeter (for adjustable sensors)Screwdrivers — flathead and PhillipsSmall socket set or nut driverElectrical contact cleanerOBD-II scan tool for code clearing and live data verification

Disconnect the battery negative terminal, unplug the TPS electrical connector, and remove the one or two retaining screws that hold the sensor to the throttle body. Install the new sensor, reconnect the connector, and — if the replacement is an adjustable type — use a multimeter to verify the closed-throttle output voltage matches the specification on the sensor or service information before tightening. Reconnect the battery, clear any stored fault codes with a scan tool, and perform a short test drive while monitoring throttle voltage on live data to confirm a smooth, linear signal.

Frequently asked questions

How much does it cost to replace throttle position sensors on a Infiniti Qx4?
Parts start at low prices for the Infiniti Qx4 at AutoBuffy. A standalone TPS is a straightforward DIY job that saves the typical shop labor charge. If the sensor is integrated into the throttle body assembly, the part cost is higher, but labor is still modest — usually under an hour at a shop.
Can I drive my Infiniti Qx4 with a bad throttle position sensor?
You can, but it isn't advisable. A failing TPS can cause sudden power loss, erratic acceleration, or limp mode activation at highway speed, creating a safety hazard. Fuel economy and emissions will also suffer. Replacing it promptly is low cost compared to the risk of being stranded or causing a secondary issue.
Do I need to calibrate or reset the throttle position sensor after replacing it on a Infiniti Qx4?
Direct-fit OEM-equivalent sensors typically require no manual calibration — the ECM relearns idle position on its own after installation. Adjustable sensors must be set to the correct closed-throttle voltage using a multimeter before the connector is tightened. Always clear any stored TPS fault codes and perform a short test drive to confirm proper operation.
What fault codes does a bad throttle position sensor set on a Infiniti Qx4?
The most common codes are P0120 through P0124, covering the primary TPS circuit range, performance, and signal faults. Dual-track sensors can also set P0220 through P0224 for the secondary circuit. Related codes like P0506 or P0507 for idle control may appear as a downstream effect of an inaccurate throttle signal.
How long does a throttle position sensor last on a Infiniti Qx4?
TPS lifespan varies widely depending on sensor design and operating conditions. Contact-type sensors with a physical wiper wear faster and may need replacement within the first several years on high-mileage vehicles. Non-contact Hall-effect sensors tend to last significantly longer. Heat cycling, moisture intrusion, and a contaminated throttle body all accelerate wear.
Will cleaning the throttle body fix the same symptoms as a bad TPS on a Infiniti Qx4?
Sometimes. Carbon buildup on the throttle bore can cause erratic idle and hesitation that mimics a failing TPS. Clean the throttle body first and clear codes before condemning the sensor. If fault codes return and the voltage signal is erratic or out of range on a live data scan, the sensor itself needs replacement.

More parts for your Infiniti Qx4

Alignment Caster / Camber KitIgnition Knock (Detonation) SensorControl Arm Repair KitCoil Spring SeatEngine Intake Manifold GasketMulti-Purpose Electrical ConnectorDrive Shaft Center Support BearingEngine Oil Pan

Throttle position sensors for other Infiniti models

Infiniti M30Infiniti G20Infiniti I30Infiniti Q45Infiniti I35Infiniti J30