OBD-II Generic Error Code P0184: Fuel Temp Sensor A Intermittent – How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P0184
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P0184 indicates an intermittent signal from the fuel temperature sensor A. This sensor monitors fuel temperature to optimize fuel injection and reduce emissions. An intermittent fault can cause rough running, poor fuel economy, or hard starting. This guide walks you through diagnosis and repair.
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Tools You'll Need

How to Fix Error Code P0184

  1. Safety First: Disconnect Battery

    Always disconnect the battery before working on fuel system components to prevent sparks or accidental fuel ignition.

  2. Locate the Fuel Temperature Sensor

  3. Inspect Wiring and Connector

    Do not use harsh chemicals near fuel system components.

  4. Test Sensor Resistance

  5. Check Voltage at Sensor Connector

    Avoid touching live circuits with bare hands.

  6. Replace Fuel Temperature Sensor

    Fuel system is under pressure. Wear safety glasses and work in a well-ventilated area.

  7. Clear Codes and Test Drive

Parts You May Need

Fuel Temperature Sensor
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O-ring (for sensor)
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Fuel Temperature Sensor
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O-ring (for sensor)
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Fuel Temperature Sensor
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O-ring (for sensor)
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Fuel Temperature Sensor
Check Price on Amazon
O-ring (for sensor)
Check Price on Amazon
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When to Call a Professional

If you cannot locate the sensor, suspect an issue with the ECU, or if the code returns after replacement, consult a professional mechanic for advanced diagnostics.

Frequently Asked Questions

Can I drive with error code P0184?
Yes, but it may cause rough running, poor fuel economy, or starting issues. It's best to fix it promptly to avoid further problems.
How much does it cost to fix P0184?
DIY cost for a new sensor is $20–$80. Professional repair including labor is $100–$250.
Where is the fuel temperature sensor located?
It's usually on the fuel rail, fuel line, or inside the fuel tank as part of the fuel pump module.
What causes an intermittent signal?
Loose wiring, corroded connectors, or a failing sensor with intermittent internal shorts or opens.
Will P0184 affect emissions testing?
Yes, because the sensor helps the ECU control fuel trim. It can cause a readiness monitor failure.

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