P1121moderate severityPowertrain
TPS Signal Not Consistent with MAF Signal
on 2001 Mazda MX-5 Miata 1.8L I4 · RWD
What this code means
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.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1