Exhaust Gas Temperature Sensor Circuit High - Bank 2 Sensor 1
The exhaust temperature sensor on Bank 2 is reading too hot or sending an abnormally high voltage signal to the engine computer. Think of it like a thermometer that's stuck on a high reading even when it shouldn't be that hot.
The ECU monitors the exhaust gas temperature (EGT) sensor voltage on Bank 2 Cylinder 1 to track post-catalyst temperatures and catalyst efficiency. When the sensor voltage exceeds the maximum expected threshold (typically 4.5-5.0V), the ECU triggers a fault indicating either a failed sensor, wiring short, or genuinely excessive exhaust temps.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| EGT Sensor Voltage | 0.2 - 4.5V (approximately 200-800°C) | > 4.5V (sensor circuit high) |
| Exhaust Gas Temperature | 200 - 800°C post-catalyst | > 900°C or sensor malfunction |
Code P0546 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, P0546 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.