Exhaust Gas Temperature Sensor Circuit - Bank 2 Sensor 1
Your engine's exhaust temperature sensor on bank 2 isn't sending the right signal to the computer. Think of it like a thermometer that's either broken or disconnected from the wall outlet.
The ECU monitors exhaust gas temperature after the catalytic converter on bank 2 to ensure proper emission control and catalyst efficiency. It expects a voltage signal between 0.5-4.5V that correlates to temperature readings of 200-800°C. If the signal is out of range, too low, too high, or missing, the fault triggers.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor voltage | 0.5-4.5V (proportional to temp) | <0.1V or >4.9V / Open/Short circuit |
| Exhaust temperature | 200-800°C under load | Below 100°C or above 900°C sustained |
Code P0547 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0547 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.