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Home/DTC Codes/Mazda/CX-3/2016-2021 2.0L I4/P1121
P1121

TPS Signal Not Consistent with MAF Signal

2016-2021 Mazda CX-3 2.0L I4 🇩🇪

Moderate SeverityPowertrain

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

  1. Compare TP and MAF readings simultaneously on scan tool
  2. Clean MAF sensor
  3. Check for vacuum leaks
  4. Test TP sensor through full range
  5. Replace air filter if restricted

Repair Notes

Clean the MAF sensor; check for vacuum leaks and replace the faulty sensor.

Related Codes

P0121Throttle/Pedal Position Sensor/Switch A Circuit Range/PerformanceP1100BARO Sensor CircuitP1100MAP Sensor Circuit MalfunctionP1100MAF Sensor IntermittentP1100MAP Sensor Circuit MalfunctionP1100BARO Sensor CircuitP1100MAP Sensor Circuit MalfunctionP1100Mass Air Flow Sensor Circuit IntermittentP1100BARO Sensor CircuitP1100MAF Sensor IntermittentP1100MAF Sensor IntermittentP1100Starter Switch Circuit MalfunctionP1101MAF Sensor Out of Self-Test RangeP1101MAF Sensor Out of Self-Test RangeP1101MAF Sensor Out of Self-Test RangeP1101MAF Sensor Out of Self-Test RangeP1101Intake Airflow System PerformanceP1101Intake Airflow System PerformanceP1101Intake Airflow System PerformanceP1101Intake Airflow System PerformanceP1101Intake Airflow System PerformanceP1101Intake Airflow System PerformanceP1101Intake Airflow System PerformanceP1101Intake Airflow System PerformanceP1101Neutral Position Switch Circuit MalfunctionP1120Secondary Throttle Position Sensor CircuitP1120Throttle Position Sensor 1 CircuitP1120Accelerator Pedal Position Sensor CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 CircuitP1120Secondary Throttle Position Sensor CircuitP1120Accelerator Pedal Position Sensor CircuitP1120Throttle Position Sensor Out of Range LowP1120Throttle Position Sensor Out of Range LowP1120Throttle Position Sensor Out of Range LowP1120Throttle Position Sensor Out of Range LowP1120Accelerator Pedal Position Sensor CircuitP1120Throttle Position Sensor 1 CircuitP1120Throttle Position Sensor 1 Circuit

Other Powertrain Codes

P1121 on Other Vehicles

Mazda 626

1993-1997 2.0L I4

Mazda 626

1993-1997 2.5L V6

Mazda 626

1998-2002 2.0L I4

Mazda 626

1998-2002 2.5L V6

Mazda Axela

2013-2019 1.5L I4 P5-VPS

Mazda Axela

2013-2019 2.2L I4 Diesel SH-VPTS

Mazda B2300

1994-1997 2.3L I4

Mazda B2300

2002-2009 2.3L I4

Common Questions

What does code P1121 mean on a 2016-2021 Mazda CX-3?

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 CX-3?

Common symptoms of P1121 include: Check Engine Light, Poor acceleration, Rough idle, Hesitation, Poor fuel economy.

What causes P1121 on a 2016-2021 Mazda CX-3?

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.

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