p0121
Moderate
Toyota · SUVs
Throttle/Pedal Position Sensor A Circuit Range/Performance
Quick Answer
Error code P0121 on your Toyota SUVs means: Throttle/Pedal Position Sensor A Circuit Range/Performance. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
4Runner TRD Pro 2024Grand Highlander Limited 2024Highlander XLE 2024Highlander Hybrid Bronze Edition 2023Land Cruiser 1958 Edition 2024RAV4 XLE Premium 2024RAV4 Hybrid SE 2024Sequoia Capstone 20244Runner Limited 20244Runner SR5 20244Runner TRD Off-Road 2024Grand Highlander Platinum 2024Grand Highlander XLE 2024Highlander LE 2024Highlander Limited 2024Highlander Platinum 2024RAV4 Adventure 2024RAV4 LE 2024RAV4 TRD Off-Road 2024RAV4 XLE 2024Sequoia Limited 2024Sequoia Platinum 2024Sequoia SR5 2024Sequoia TRD Pro 2024Venza Limited 2024
Likely Causes
How to Fix It
1
Clean the throttle body bore and plate with throttle body cleaner
2
Use a scan tool to monitor TPS voltage while slowly opening the throttle and check for dropouts or jumps
3
Inspect the throttle body wiring harness and connector for damage or corrosion
4
Perform a throttle body relearn procedure after cleaning
5
Replace the throttle body assembly if the TPS output is erratic after cleaning
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Throttle body assembly
Throttle body cleaner
Throttle body gasket
Wiring repair connector
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