The P242C: Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 3 refers to an issue where the voltage in the exhaust gas temperature sensor circuit for Bank 1, Sensor 3, is lower than expected. This could be due to a faulty sensor, problems in the wiring, or issues with connectors that are causing the sensor to provide a low signal.
P242C – Quick Overview
Code | Information |
---|---|
Meaning | P242C: Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 3 |
Is it serious? | Moderate – if not addressed, it can result in improper exhaust management and increased emissions. |
Possible causes | – Low voltage in the exhaust gas temperature sensor circuit Bank 1 Sensor 3 – Faulty sensor – Wiring or connector problems |
How to diagnose? | – Measure voltage in the exhaust gas temperature sensor circuit – Inspect and test the sensor and wiring – Replace faulty sensor if needed |
P242C Meaning
The P242C: Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 3 code indicates that the voltage from the exhaust gas temperature sensor in Bank 1, Sensor 3, is below the expected range. This might happen due to a malfunctioning sensor, damaged wiring, or poor connections. A low signal can result in incorrect readings of the exhaust gas temperature, leading to improper exhaust management, increased emissions, and reduced engine efficiency.
Step-by-step diagnostic guide
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use an OBD-II scanner to see if there are any additional codes present. Multiple codes can help provide a more complete picture of the issue. | OBD-II Scanner |
Inspect the Sensor | Visually inspect the exhaust gas temperature sensor for Bank 1 Sensor 3 for any visible damage, corrosion, or improper installation. | Flashlight, Safety Gloves |
Measure Voltage in the Circuit | Measure the voltage in the exhaust gas temperature sensor circuit using a multimeter to ensure it matches manufacturer specifications. | Multimeter |
Test the Sensor | Test the exhaust gas temperature sensor output and compare it to manufacturer data to see if it is producing the correct readings. | Diagnostic Tool, Multimeter |
Inspect Wiring and Connectors | Check all wiring and connectors associated with the sensor for damage, loose connections, or corrosion that could be causing low voltage. | Flashlight, Multimeter |
Repair or Replace Wiring | Repair or replace any damaged wiring or connectors to ensure a proper electrical connection to the sensor. | Wiring Repair Kit, Connector Tools |
Replace the Sensor if Faulty | If the sensor is determined to be defective, replace it to restore proper sensor function. | Replacement Sensor, Wrench Set |
Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and perform a test drive to verify that the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
Recheck for Codes | After the test drive, re-scan the vehicle to ensure that the P242C code has not returned. If the code reappears, additional diagnostics may be required. | 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)