P0547
Exhaust Gas Temperature Sensor Circuit - Bank 2 Sensor 1
Powertrain Emission Controls EGT Sensor Circuit 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

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.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated
Rough idle or reduced engine performance
Possible excessive exhaust smoke or smell
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Embedded Systems Insight
What the ECU/ECM is actually computing

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.

Voltage & Parameter Thresholds

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
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring connectors and harness
Inspect and reseat the sensor connector; clean corrosion from pins with electrical contact cleaner.
2
Exhaust Gas Temperature Sensor (EGT)
Unbolt the faulty sensor from the exhaust manifold or pipe on bank 2 and install a new one with proper torque specs.
3
Wiring harness/shielding
Replace damaged or worn wiring between sensor and ECU if corrosion or fraying is found.