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P0546 is a diagnostic trouble code (DTC) for "Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 1". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0546 code means Exhaust Gas Temperature Sensor (EGT) Circuit High Bank 1 Sensor 1. Alternately, code P0545 may be present, indicating sensor circuit low.
P0546 indicates that there is a malfunction related to the exhaust gas temperature sensor circuit. The purpose of the sensor is to protect the catalytic converter from heat damage. This sensor converts temperature to voltage, and inputs this data to the PCM (powertrain control module). If the voltage sent to the PCM exceeds the predetermined limits set by the vehicle manufacturer, the vehicle will store this code.
There are several problems that can cause the sensor to send an excessive voltage signal to the PCM, including:
The symptoms of this code typically only include the stored code itself, as well as a lit Check Engine Light.
The steps involved in diagnosing this issue include:
Clearing the code(s), then road testing the vehicle and checking for it to come back.
Visually inspecting the exhaust gas temperature sensor and relevant circuitry, focusing in particular on areas that may be in contact with hot components
Inspecting connectors for corrosion or loose connections
Inspecting wires for missing insulation or other damage that could cause a short to ground
Checking the EGT sensor’s resistance using an ohmmeter to ensure it has around 150 ohms
Using a heat gun or hair dryer to heat the sensor while observing the ohmmeter to ensure that the resistance is dropping as the sensor heats up, and rising as it cools down
Testing the voltage on the engine end of the pigtail to ensure that there are five volts at this connector
The oxygen sensor can sometimes be mistaken for the EGT sensor. The two are different in appearance, however, with the EGT sensor being simply a two-wire plug. It is located between the exhaust manifold and the catalytic converter. Replacing the oxygen sensor will not correct this trouble code. If you’re not confident about your ability to recognize and diagnose the correct sensor, consult a professional.
If not attended to promptly, this code indicates a problem that could lead to catalytic converter damage. While there are temporary fixes that can fool the computer into no longer setting the code, the issue should be addressed as soon as possible.
Repairs that may fix the P0546 code may include:
Keep in mind that one of the possible causes of this code – installing a catback system in place of the catalytic converter – is against the law in many states due to these systems creating high emissions levels. Before performing such a modification, you should check your state and local laws to make sure that there are no restrictions on such a procedure.
As you inspect the sensor’s connectors for corrosion or loose connections, make sure you go up the pigtail to the connector to make sure that one is secure as well.
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