What Does P0121 Mean on a 2022 Nissan Maxima?
P0121 on your 2022 Nissan Maxima directs our investigation to the throttle position sensor (TPS). The sensor is transmitting voltage within the expected range but following an abnormal pattern—the ECM detects readings that conflict with its calculations from pedal position, airflow, and engine load parameters.
The 2022 Maxima—one of the final model years for Nissan's sports sedan—runs the 3.5L VQ35DE V6 (300 hp) with a CVT. This port-injected V6 benefits from fuel wash across the intake valves, keeping the throttle body cleaner than DI engines. The electronic throttle body houses the integrated TPS.
Common Symptoms to Watch For
- Check engine light on
- Hesitation or flat spot during acceleration
- Rough or surging idle
- CVT response feels delayed in sport mode
- Throttle feels inconsistent between drive modes
- Lower fuel economy
Top Causes Ranked by Likelihood
- Carbon buildup on throttle body (35%) – At 2-4 years, early carbon accumulation from PCV gases is possible, especially with short-trip driving. Cost: $150–$300.
- Throttle body assembly failure (25%) – Internal TPS defect or early wear from the high-output V6's demanding throttle operation. Cost: $0 under warranty; $300–$520 otherwise.
- ECM software calibration (20%) – A calibration update may be available. Cost: $0 under warranty; $100–$175 otherwise.
- Wiring or connector issue (15%) – Corrosion or manufacturing variability. Cost: $0 under warranty; $80–$250 otherwise.
- Intake system leak (5%) – A gasket or vacuum hose issue. Cost: $0 under warranty; $100–$300 otherwise.
How Serious Is This Code?
P0121 is medium severity. On a 300 hp sports sedan, you'll feel the throttle inconsistency immediately. The CVT's sport mode programming is especially sensitive to TPS accuracy. Address this soon.
Diagnostic Path
Check warranty first—your 2022 Maxima should be within the 5yr/60k powertrain warranty and may be within the 3yr/36k basic warranty. Let the dealer diagnose with CONSULT for the most efficient resolution.
Can You Fix This Yourself?
Use warranty coverage first—it's likely still active. If out of warranty, throttle body cleaning is moderate difficulty. After service: ignition ON 3 seconds, start, idle 10 minutes.
Get a Free AI Diagnosis
Restore your Maxima's edge. AutoDetective's free AI diagnosis provides a targeted analysis of your P0121 based on your mileage and symptoms.