TPS Signal Not Consistent with MAF Signal
2014-2021 Mazda Mazda6 2.5L I4 🇨🇦
Description
The Throttle Position sensor and Mass Air Flow sensor readings do not agree with each other. When the throttle shows a certain opening, the MAF does not confirm the expected airflow volume.
Symptoms
- Check Engine Light
- Poor acceleration
- Rough idle
- Hesitation
- Poor fuel economy
Common Causes
- Dirty or faulty MAF sensor
- Faulty TP sensor
- Vacuum leak allowing unmetered air
- Restricted air filter
- Intake air leak between MAF and throttle body
Diagnostic Steps
- Compare TP and MAF readings simultaneously on scan tool
- Clean MAF sensor
- Check for vacuum leaks
- Test TP sensor through full range
- Replace air filter if restricted
Repair Notes
Clean the MAF sensor; check for vacuum leaks and replace the faulty sensor.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1121 on Other Vehicles
Common Questions
What does code P1121 mean on a 2014-2021 Mazda Mazda6?
P1121 stands for "TPS Signal Not Consistent with MAF Signal". The Throttle Position sensor and Mass Air Flow sensor readings do not agree with each other. When the throttle shows a certain opening, the MAF does not confirm the expected airflow volume.
What are the symptoms of P1121 on a Mazda Mazda6?
Common symptoms of P1121 include: Check Engine Light, Poor acceleration, Rough idle, Hesitation, Poor fuel economy.
What causes P1121 on a 2014-2021 Mazda Mazda6?
Common causes of P1121 include: Dirty or faulty MAF sensor, Faulty TP sensor, Vacuum leak allowing unmetered air, Restricted air filter, Intake air leak between MAF and throttle body.