P0121 on Your 2024 Mitsubishi Outlander
When your 2024 Mitsubishi Outlander logs P0121, the ECM has detected that the throttle position sensor signal is in range but behaving irregularly. Our detective has flagged the throttle body for closer examination.
The 2024 Outlander continues with the 2.5L naturally aspirated four-cylinder (181 hp) with port fuel injection and CVT. The PHEV variant uses a plug-in hybrid system with a different powertrain. Now in its third year on the new platform, the standard Outlander's powertrain is well-refined.
Symptoms
- Check engine light on
- Hesitation on acceleration
- Idle roughness
- CVT response inconsistency
- Throttle response delayed
Probable Causes
- ECM software calibration – Mitsubishi continues refining the platform. Likelihood: 35%
- Carbon deposits – Port injection keeps it cleaner, but PCV vapors still accumulate. Likelihood: 30%
- Throttle body defect – Manufacturing issue. Likelihood: 20%
- Connector issue – Factory assembly problem. Likelihood: 10%
- Intake leak – Loose duct or gasket. Likelihood: 5%
Cost
- All repairs: $0 under warranty
- Out-of-warranty reference: Cleaning $80–$150, replacement $250–$450, software $80–$150
Mitsubishi's Warranty
Your 2024 Outlander is fully covered under Mitsubishi's 5-year/60,000-mile basic and 10-year/100,000-mile powertrain warranties. Take it to the dealer for free repair via MUT-III diagnostics.
How AutoDetective AI Can Help
Upload your Outlander's scan data to AutoDetective for a free diagnosis tailored to the 2.5L port-injection platform.