What Does P242D Mean?
The EGT sensor 3 on bank 1 is reporting voltage or temperature values that are consistently higher than the maximum threshold. This suggests an open circuit or sensor reading abnormally high resistance.
Common Causes
40%
Open circuit in EGT sensor or sensor failure
30%
Open or broken wire in sensor circuit
20%
Corroded or disconnected sensor connector
10%
ECM circuit failure or high resistance in ECM ground
Diagnostic Steps
1
Step 1: Inspect sensor connector for proper seating, corrosion, and terminal tension
2
Step 2: Disconnect sensor and measure resistance; should read within specification (typically 50-5000 ohms depending on temperature)
3
Step 3: Check continuity of signal and ground wires from sensor connector to ECM
4
Step 4: Verify 5V reference voltage at sensor connector with key on, engine off
5
Step 5: Replace sensor if circuit tests pass but sensor resistance is infinite or unstable
Estimated Repair Cost
$200 - $550
Parts + labor, varies by vehicle and location
The EGT sensor 3 on bank 1 is reporting voltage or temperature values that are consistently higher than the maximum threshold. This suggests an open circuit or sensor reading abnormally high resistance.
The most common cause of P242D (Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 3) is: Open circuit in EGT sensor or sensor failure
Typical repair costs for P242D range from $200 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is drivable but emission controls may not function properly. May lead to catalytic converter or DPF damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P242D to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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