The P0549: Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 1) code indicates that the engine control module (ECM) has detected a higher-than-expected voltage from the exhaust gas temperature sensor in Bank 2, Sensor 1. This sensor monitors exhaust gas temperatures, and an issue with high voltage may lead to incorrect readings, affecting engine performance and emissions control.
P0549 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0549: Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 1) |
| Is it serious? | Yes, it can lead to inaccurate emissions control and potential damage to engine components. |
| Possible causes | – Faulty exhaust gas temperature sensor – High voltage to sensor – Wiring issue |
| How to diagnose? | – Test the exhaust gas temperature sensor for voltage – Inspect wiring and connectors – Check the exhaust system for issues |
P0549 Meaning
The P0549: Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 1) code is triggered when the ECM detects higher-than-expected voltage from the exhaust gas temperature sensor. This sensor helps monitor the exhaust gas temperature to ensure safe operation of the engine and emissions system. High voltage readings can cause incorrect temperature monitoring, leading to improper engine performance or emissions control.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any related fault codes that might provide more context about the exhaust or emissions system issue. | OBD-II Scanner |
| Test the Exhaust Gas Temperature Sensor for Voltage | Use a multimeter to measure the voltage output from the exhaust gas temperature sensor. Compare the readings with manufacturer specifications to ensure proper operation. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connectors | Visually inspect the wiring and connectors leading to the exhaust gas temperature sensor for signs of damage, corrosion, or loose connections that could cause high voltage. | Flashlight, Multimeter |
| Check the Exhaust System for Issues | Inspect the exhaust system components (e.g., catalytic converter, exhaust manifold) for any blockages, damage, or issues that could affect the sensor’s readings. | Basic Tools, Inspection Mirror |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and test drive the vehicle to ensure proper sensor operation and cooling system function. | OBD-II Scanner, Vehicle Manual |
| Recheck for Codes | Re-scan the vehicle after the test drive to ensure that the P0549 code hasn’t returned. | OBD-II Scanner |
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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)