P1100moderate severityPowertrain
Mass Air Flow Sensor Circuit Intermittent
on 2003 Mazda MX-5 Miata 1.8L I4 · RWD
What this code means
The Mass Air Flow sensor signal is intermittent. The PCM has detected erratic or fluctuating readings from the MAF sensor that drop in and out during operation, causing inconsistent fuel metering.
Symptoms
- Check Engine Light
- Intermittent rough idle
- Hesitation on acceleration
- Stalling
- Erratic fuel economy
Common causes
- Loose MAF sensor connector
- Damaged MAF sensor wiring
- Dirty MAF sensor element
- Cracked air intake tube allowing unmetered air
- Failing MAF sensor
Diagnostic steps
- Inspect MAF sensor connector for looseness or corrosion
- Wiggle test MAF wiring while monitoring live data
- Inspect air intake tube for cracks or loose clamps
- Clean MAF sensor with MAF-specific cleaner
- Monitor MAF readings for erratic behavior
Repair notes
Clean the MAF sensor first; if the problem persists, inspect wiring and replace the MAF 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