P0182
Fuel Temperature Sensor A Circuit Range/Performance
Powertrain Fuel and Air Metering Fuel temperature sensing 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

Your fuel temperature sensor is sending a signal that's outside the normal range, like a thermometer giving impossible readings. The engine computer can't trust the fuel temperature data it's receiving, which affects fuel injection timing and efficiency.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated
Rough idle or hesitation during acceleration
Decreased fuel economy
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the fuel temperature sensor's voltage signal, which should vary proportionally with fuel temperature (typically -40°C to 125°C). The sensor resistance changes with temperature, and the ECU checks if the voltage falls within the expected range. If the signal is implausibly high, low, or unstable, the fault is triggered.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Sensor voltage 0.5-4.5 volts (proportional to temp) Below 0.1V or above 4.9V, or erratic
Fuel temperature range -40°C to 125°C Out-of-range signal or no signal detected
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Fuel temperature sensor connector
Inspect and reseat the connector at the fuel tank or fuel rail; clean corrosion from terminals.
2
Fuel temperature sensor wiring harness
Check for damaged, pinched, or corroded wires between the sensor and ECU; repair or replace as needed.
3
Fuel temperature sensor
Replace the sensor if connector and wiring are sound; sensor has likely failed internally.