Parts for your 2008 Nissan Maxima-Throttle position sensors

2008 Nissan Maxima throttle position sensors (TPS)

Based on the Nissan Factory Service Manual for the 2008 Maxima (EC section: Electronic Throttle Control System) and mainstream service data (e.g., Alldata/Mitchell), this model absolutely uses throttle position sensing. It’s an electronic throttle (drive‑by‑wire) setup where twin throttle position sensors are built into the throttle body assembly alongside the throttle control motor. There isn’t a separate, bolt‑on TPS, if the TPS side fails, the usual repair is the complete electronic throttle body replacement. The accelerator pedal also has its own position sensor, which works in tandem with the TPS.

On the 2008 Maxima, the TPS tells the engine computer exactly how far the throttle plate is open. That means smoother take‑offs, cleaner shifts, stable idle, and precise fuel and spark control, plus cruise control and traction systems behaving as they should. Nissan builds in two TPS signals (Sensor 1 and Sensor 2) for redundancy and safety, if they disagree, the car can jump into limp mode to protect the engine and driveline.

Typical TPS‑related symptoms on this Maxima include erratic idle, stalling at stops, lazy throttle response, hunting revs, cruise dropping out, and a MIL with codes such as P0121/P0122/P0123 or correlation codes like P2135. Because the sensors are integral to the throttle body, technicians generally replace the entire assembly rather than the TPS alone.

Good servicing practice for the Maxima’s throttle set‑up looks like this:

• Inspect the throttle body connector and loom for corrosion, moisture ingress, or chafing before condemning the unit.
• If cleaning is required, remove the throttle body and use a proper throttle‑body cleaner. Don’t lever the plate by hand and don’t drown the electronics. Fit a new gasket on refit.
• After battery disconnection, throttle body replacement, or a thorough clean, carry out the Nissan closed‑throttle and Idle Air Volume Learn. A capable scan tool is ideal, the pedal‑procedure can work if done exactly as per the service manual. Skipping this often leaves a high or unstable idle.
• Use quality parts that match the VQ35DE application, and tighten fasteners to factory spec.

If drivability niggles remain after fitting a new throttle body and completing the learn routines, it’s smart to check the accelerator pedal position sensor and grounds, as these also influence throttle behaviour on this platform.

Popular questions about 2008 Nissan Maxima throttle position sensors

Does the 2008 Maxima actually have a TPS, or is it just drive‑by‑wire?
Yes, it’s drive‑by‑wire, and the throttle position sensing is built into the electronic throttle body. The ECU relies on dual TPS signals plus the accelerator pedal sensor to manage throttle angle and torque.

Can the TPS be replaced by itself on a 2008 Maxima?
No. On this model the TPS is not a separate service item. If the TPS fails or goes out of range, the accepted fix is replacing the complete electronic throttle body and then performing the required relearn procedures.

What fault codes and symptoms point to a TPS issue?
Common codes include P0121, P0122, P0123, and correlation codes like P2135. Symptoms often show as limp mode, poor idle, surging, and delayed throttle response. Always check wiring and perform the idle learn before calling the throttle body faulty.