P0184–P0189 Fuel Temperature Sensor A Circuit Intermittent
The fault comes and goes, which points at a connection that only breaks under vibration, heat or load.
Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P0184 | Fuel Temperature Sensor A Circuit Intermittent | Investigate soon |
P0189 | Fuel Temperature Sensor B Circuit Intermittent | Investigate soon |
The definition
P0184: Fuel Temperature Sensor A Circuit Intermittent.
P0184 is a powertrain code (the engine or gearbox), defined by the SAE standard - it means the same thing on any make of car, and any generic OBD-II reader will decode it.
What to check first
Cheapest and fastest checks first:
- Read the freeze-frame data stored with the fault - engine speed, load and temperature at the moment it logged tell you whether this happens cold, hot or under load.
- Check the connector at the part for corrosion, and that it is fully seated.
- Clear the code and see whether it returns, and under what conditions.
What actually causes this on a VAG
Intermittent means the fault has come and gone rather than being present now. The ECU caught the fuel temperature signal dropping out or jumping momentarily, then behaving itself again. That pattern points at a connection making and breaking with vibration, heat or damp rather than at a sensor that has simply died - a dead sender would give a steady 'circuit high' or 'circuit low' code instead.
Most likely causes, in order
- Connector pin tension or corrosion. The single most common cause. Unplug and look closely at the pins: spread, green or slightly recessed contacts all cause exactly this. Refit and make sure the plug actually latches rather than just resting in place.
- Chafed loom. Somewhere the wire rubs on a bracket, hose or hard edge and touches earth only when the engine rocks or the car goes over a bump. Follow the run looking for a worn shiny patch or tape that has worn through.
- Water ingress. Damp getting into the plug and then drying out gives faults that appear in wet weather and vanish in dry. If the light tracks the weather or reappears after a jet wash, that is your answer.
- The sender going intermittent internally. Possible, but suspect it last - and only after the plug and wiring have been physically checked, not just looked at.
Worth knowing: Do not fit a sender for this code. Intermittent faults are connections until proven otherwise, and the way to prove it is a wiggle test: leave a scan tool showing live fuel temperature with the ignition on, then move the plug and the loom by hand section by section. If the reading twitches, you have found it, and you will usually have fixed it for the price of a connector clean rather than a part.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Common questions
What does P0184 mean?
P0184 means Fuel Temperature Sensor A Circuit Intermittent. The fault comes and goes, which points at a connection that only breaks under vibration, heat or load.
Can I drive with P0184?
The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.