P0121 code
Driver
Joined: Jun 2022
Posts: 85
Likes: 22
From: CA
Google P0121 shows error code for Throttle Positioner, or system runs too lean, caused by excess air intake.
Could be leaks in the air intake, filter box, hoses, dirty Airflow sensor ect.
What were last last things you did to the car? That may have caused the problems. Look around those areas.
The air filter must be installed properly in the intake box or it may cause a leak. Airbox should be closed tight.
The Airflow sensor may be dirty, needs cleaning with residue-free contact cleaner spray.
Blow smoke in the air intake to find leaks.
Could be leaks in the air intake, filter box, hoses, dirty Airflow sensor ect.
What were last last things you did to the car? That may have caused the problems. Look around those areas.
The air filter must be installed properly in the intake box or it may cause a leak. Airbox should be closed tight.
The Airflow sensor may be dirty, needs cleaning with residue-free contact cleaner spray.
Blow smoke in the air intake to find leaks.
Thread Starter
10th Gear
Joined: Feb 2026
Posts: 10
Likes: 0
P0121
Google P0121 shows error code for Throttle Positioner, or system runs too lean, caused by excess air intake.
Could be leaks in the air intake, filter box, hoses, dirty Airflow sensor ect.
What were last last things you did to the car? That may have caused the problems. Look around those areas.
The air filter must be installed properly in the intake box or it may cause a leak. Airbox should be closed tight.
The Airflow sensor may be dirty, needs cleaning with residue-free contact cleaner spray.
Blow smoke in the air intake to find leaks.
Could be leaks in the air intake, filter box, hoses, dirty Airflow sensor ect.
What were last last things you did to the car? That may have caused the problems. Look around those areas.
The air filter must be installed properly in the intake box or it may cause a leak. Airbox should be closed tight.
The Airflow sensor may be dirty, needs cleaning with residue-free contact cleaner spray.
Blow smoke in the air intake to find leaks.
so I changed the throttle body lol becuase it was also not idling or having throttle response much but I still have that code paired with p0120 and p1121 car has cold air intake
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