P242D – Exhaust Gas Temperature Sensor Circuit, Bank 1, Sensor 3

Meaning of Code P242D

Code P242D indicates a problem with the Exhaust Gas Temperature Sensor (EGTS) Bank 1 Sensor 3. This sensor plays a key role in:

• 🔥 Monitoring temperature before the DOC (Diesel Oxidation Catalyst) or DPF (Diesel Particulate Filter)

• ⚡ Transmitting data to the PCM to optimize combustion and DPF regeneration

• 🌍 Controlling pollutant emissions to comply with anti-pollution standards

A fault can lead to poor DPF regeneration management and increased pollutant emissions.

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Possible Causes of Code P242D

1. EGTS Sensor Failure

• Faulty sensor providing inconsistent values

• Excessive soot deposits or physical damage

2. Electrical Problems

• Cut or short-circuited wiring harness

• Oxidized, loose, or corroded connector

• Power supply or ground issue

3. Exhaust Leaks

• Leak before the sensor skewing measurements

• Damaged gaskets or pipes

4. Particle Accumulation

• Severe sensor clogging from soot

• DPF regeneration problem

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Symptoms of Code P242D

• 🚨 Check engine light on (and possibly DPF light)

• ⚠ More frequent DPF regenerations or impossible regenerations

• ⛽ Increased fuel consumption

• 🐌 Loss of engine power (possible limp mode)

• 💨 Excessive exhaust smoke

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Diagnosis and Repair of Code P242D

🔧 Required Tools:

• Advanced OBD2 scanner (for real-time data)

• Digital multimeter

• Flashlight and inspection mirror

• Sensor cleaner (if clogged)

📋 Diagnostic Procedure:

1. Visual Inspection

• Check the condition of the sensor and its connector

• Look for exhaust leaks before the sensor

• Check for soot or deposit buildup on the sensor

2. EGTS Sensor Test

1. Measure the sensor’s resistance (compare to manufacturer specifications)

2. Check the supply voltage (typically 5V)

3. Compare temperature values with a scanner (should be plausible)

3. Electrical Circuit Check

• Test continuity between the sensor and PCM

• Look for short circuits or poor grounds

4. Corrective Solutions

• Cleaning the sensor if clogged (with specific product)

• Replacing the sensor if faulty

• Repairing exhaust leaks

• Replacing the wiring harness if damaged

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Consequences of Not Repairing

• 🔥 Exhaust system overheating

• 💰 Costly damage to DPF or DOC

• ⚠ Exceeding pollutant emission limits

• 🚗 Engine entering limp mode

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Conclusion

Code P242D signals a critical problem in the exhaust temperature monitoring system. Prompt action is necessary to:

• Avoid damage to the DPF/DOC

• Maintain engine performance

• Comply with anti-pollution standards

⚠ Tip: If diagnosis is complex, consult a diesel systems specialist to avoid improper repairs.

➡ Is your vehicle showing this code? Describe your symptoms in the comments for personalized help!