The 2021 Mazda CX-30's P0184 code indicates the ECU detected intermittent or erratic signals from the Fuel Temperature Sensor A. Unlike consistent high or low codes, intermittent codes suggest connection problems or sensor issues that come and go.
What P0184 Means
P0184 indicates the fuel temperature signal is dropping out, spiking, or behaving erratically. The sensor may provide correct readings most of the time but periodically send incorrect data. This intermittent pattern typically points to connection issues.
CX-30 Fuel System
The 2021 CX-30 uses the Skyactiv-G 2.5L four-cylinder with either port injection or the newer Skyactiv-X with compression ignition technology. Both systems use fuel temperature data for injection calculations, though Skyactiv-X is more sensitive to precise fuel data.
Common Causes of Intermittent Fuel Temperature Signals
Loose or corroded connectors cause most intermittent issues. The fuel temperature sensor connector may have worn terminals or internal corrosion that creates intermittent contact under vibration or temperature changes.
Damaged wiring that maintains contact most of the time but opens under certain conditions causes intermittent signals. Partial wire breaks may work until heat expansion or vibration opens the connection.
A failing sensor may work intermittently. Temperature-sensitive internal components may function at certain temperatures but fail at others.
Diagnostic Strategy
Monitor fuel temperature data while wiggling the connector and wiring. Look for changes that correspond to manipulation. Drive while monitoring, noting any correlation between data anomalies and engine behavior. Check connector terminals for wear or corrosion.