Fuel Temperature Sensor #2 Circuit Failure
The engine computer detected a broken or disconnected wire/sensor for the fuel temperature gauge in the second fuel tank or system. Think of it like a thermometer that stopped working—the car can't read how hot the fuel is.
The ECM monitors voltage output from Fuel Temperature Sensor #2 to calculate fuel density and adjust injection timing and pressure. The sensor typically produces a voltage signal between 0.5V–4.5V corresponding to temperature changes. If voltage reads out-of-range or the circuit is open/shorted, the ECU logs code B1226.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage | 0.5V to 4.5V (proportional to -40°C to 125°C) | Out of range, open circuit, or short to ground |
| Signal Continuity | Continuous signal present | No signal or intermittent dropout |
Code B1226 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B1226 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.