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P0545 is a diagnostic trouble code (DTC) for "Exhaust Gas Temperature Sensor Circuit Low 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 P0545 code means that the powertrain control module or PCM has triggered the code because it detects a fault in the exhaust system gas temperature sensor circuit.
A P0545 code is an OBD-II generic code that indicates an issue with the exhaust system gas temperature sensor. The PCM detects voltage variations in the sensor, which it reads as exhaust gas temperature. It then adjusts the air to fuel ratios or the ignition timing to cause the exhaust gas temperature to lower in order to protect the catalytic converter. If it determines that there are variations in the voltage outside of the vehicle manufacturer’s programmed levels, it sends the code.
A P0545 may be due to:
Typically, the symptoms of the P0545 code are minimal, and tend to be limited to nothing more than the service engine warning lighting on the dashboard and the code being stored.
To diagnose the P0545 requires an OBD-II scanner, and mechanic or technician will first clear the codes and retest. They will also do a visual scan of the connections and wiring, first replacing or repairing anything that is shorted, corroded, loose or damaged.
They retest and if the code remains they will then do an inspection on the sensor and all of its circuitry, especially any components near the heated areas of the exhaust system. They may repair or replace damaged components and then use their ohm meter to check the sensors voltage. They may use a heat gun to check the sensor and replace it if needed. They may also test the PCM for system continuity and resistance, replacing and reprogramming if needed.
A typical mistake made when diagnosing the P0545 code is to assess the oxygen sensors and not the exhaust gas temperature sensor. Some technicians also make the mistake of believing that the exhaust gas temperature sensor and the heated oxygen sensors are a single unit, and often leads to a replacement of the oxygen sensor without fixing the issue that caused the code.
The P0545 code will not prevent the car from operating, but it can be due to extremes of heat in the exhaust system, meaning that if ignored it can eventually lead to harm or loss of the catalytic converter.
To fix the P0545 code, a mechanic will:
It is rare that this code leads to the need to replace the PCM. Instead, check the wiring and don’t ignore any oxygen sensor codes that appear in the freeze frame data. Rule these out before replacing the sensor or the PCM.
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