P246A – Intermittent/Erratic Exhaust Gas Temperature Sensor Circuit, Bank 2 Sensor 3

P246A Possible Causes

  • Faulty Exhaust Gas Temperature Sensor (EGTS), Bank 2 Sensor 3
  • Exhaust Gas Temperature Sensor, Bank 2 Sensor 3 wiring harness open or short circuit
  • Poor electrical connection in Bank 2 Sensor 3 Exhaust Gas Temperature Sensor circuit
  • Exhaust leaks
  • Excessive particulate buildup on sensor

How to Fix Code P246A

Check the “Possible Causes” listed above. Visually inspect related wiring harnesses and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P246A Symptoms

Possible

Illuminated engine light (or service engine soon warning light)

P246A Meaning

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out-of-range high values. The EGTS is located upstream of the Diesel Oxidation Catalyst (DOC) and/or upstream of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it to voltage, sending it back to the PCM with the voltage signal to control engine conditions for effective emission reduction. The PCM sets OBDII code P246A when the exhaust gas temperature sensor is outside factory specifications.

P246B – Incorrect Vehicle Conditions for Diesel Particulate Filter Regeneration

P246B Possible Causes

  • Fuel system concerns
  • Turbocharger system concerns
  • Exhaust leaks
  • Oxidation catalytic converter (OC)
  • Aftermarket exhaust accessories or performance modifications

How to Fix Code P246B

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P246B Possible Symptoms

Engine light on (or service engine soon warning light)

P246B Meaning

The Powertrain Control Module (PCM) monitors the conditions required for diesel particulate filter regeneration. The test fails when the diesel particulate filter regeneration level is not at the target reduction after 13 minutes of active regeneration.

P246C – Diesel Particulate Filter Restriction, Forced Limited Power

Code P246C: Diesel Particulate Filter (DPF) Problem

Probable Causes:

  • Clogged or damaged diesel particulate filter (DPF).

  • Malfunction of the DPF regeneration system.

  • Faulty electrical circuit (wiring, connectors, associated sensors).

Symptoms:

  • Engine light illumination (or “Service engine soon” warning message).

  • Reduced engine power (limp mode).

  • EGR system deactivation.

  • Increased pollutant emissions.

Meaning of Code P246C:
The diagnostic system monitors the restriction (soot accumulation) in the DPF. If the measured pressure exceeds a first predefined threshold for a determined duration, a warning light comes on. If the second threshold is exceeded, the malfunction indicator lamp (MIL) activates, engine power is limited, and the EGR valve is deactivated to protect the engine.

Diagnostic Steps:

  1. Visual inspection: Check the electrical harness, connectors, and sensors related to the DPF. Look for oxidized, broken, or poorly secured pins.

  2. Data analysis: Use an OBD-II scanner to check DPF differential pressures and associated errors.

  3. Regeneration check: Ensure the active DPF regeneration process is functioning correctly.

Repair Procedure:

  1. DPF replacement: If the filter is irrecoverable (severe clogging or crack), replace it with a part that meets manufacturer specifications.

  2. Code reset: Clear the P246C code with an OBD-II scanner after repair.

  3. Final verification: Perform a road test to confirm the disappearance of symptoms and that the code does not reappear.

Technical Tip:
Preventive maintenance (regular cleanings, use of quality fuel) extends the DPF’s lifespan. In case of frequent regeneration, also inspect the injection system and pressure sensors.

P246D – Diesel Particulate Filter Pressure Sensor ‘A’/’B’ Correlation

P246D Possible Causes

  • Faulty diesel particulate filter pressure sensor
  • Diesel particulate filter pressure sensor harness is open or shorted
  • Poor electrical connection in diesel particulate filter pressure sensor circuit

How to Fix Code P246D

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P246D

Symptoms

Possible

Illuminated engine light (or service engine soon warning light)

P246D Meaning

The Powertrain Control Module (PCM) monitors the rationality of the diesel particulate filter (DPF) pressure sensor during idle and part-load operating conditions. The test fails when the diesel particulate filter pressure sensor signal value at idle is less than 0.15 kPa (0.022 psi). The test also fails when the diesel particulate filter pressure sensor signal value at part-load is below a minimum value or above a maximum value. These minimum and maximum values are based on exhaust volume.

P246E – Exhaust Gas Temperature Sensor Circuit, Bank 1 Sensor 4

Meaning of Code P246E

Code P246E indicates that the Exhaust Gas Temperature Sensor (EGTS) located at Bank 1, Sensor 4 is sending a signal outside the manufacturer’s specifications. This sensor monitors the exhaust gas temperature upstream of the Diesel Oxidation Catalyst (DOC) or the Diesel Particulate Filter (DPF). The PCM (Powertrain Control Module) uses this data to:

  • 🔥 Optimize DPF regeneration (burning off particulates).

  • 🌍 Control pollutant emissions (NOx, CO).

  • 🚗 Adjust engine parameters (injection, EGR).

Common Symptoms

  • 🚨 Check Engine light on (Check Engine).

  • 📉 Loss of power (limp mode to protect the DPF).

  • ⛽ Increased fuel consumption.

  • 💨 Excessive smoke from the exhaust (white or black).

  • ⚠️ DPF warning message (if the vehicle is equipped with one).

Possible Causes

  1. Faulty EGTS sensor:

    • Thermal drift, internal resistance out of range, or slow response.

  2. Wiring issues:

    • Short circuit, open circuit, or corrosion in the sensor harness.

  3. Poor electrical connection:

    • Oxidized pins, improperly engaged connector.

  4. Exhaust leaks:

    • Cracks in the exhaust manifold, faulty gaskets.

  5. Sensor fouling:

    • Soot or particle buildup distorting measurements.

Step-by-Step Diagnostic Procedure

1. Visual Inspection

  • Locate the EGTS sensor: Usually situated near the DOC or DPF (refer to the service manual).

  • Check the harness and connector:

    • Look for pinched wires, burnt insulation, or signs of corrosion.

    • Clean the pins with contact spray (CRC Electrical Cleaner).

2. EGTS Sensor Testing

  • Resistance measurement:

    • Disconnect the sensor and use a multimeter in ohmmeter mode (Ω).

    • Compare the resistance at room temperature with manufacturer specifications (e.g., 200–300 kΩ at 20°C).

    • If out of range → Replace the sensor.

  • Voltage test:

    • Reconnect the sensor, turn the ignition on.

    • Measure the voltage between the signal wire and ground (expected: 0.1–4.8 V, varying with temperature).

3. Exhaust Leak Check

  • Visually inspect the exhaust path (manifold, pipes, gaskets).

  • Use a smoke generator or soapy water to detect leaks near the sensor.

4. Sensor Cleaning

  • Remove the sensor and clean it with a high-temperature degreasing spray (*WD-40 Specialist*).

  • Avoid abrasive tools to prevent damaging the sensing element.

5. PCM Verification

  • Use an advanced diagnostic tool (e.g., Autel MaxiCOM, Snap-On Verus) to:

    • Read live data (displayed temperature vs. actual).

    • Check for related codes (e.g., P246A-P246D).

Repair Solutions

  1. Replace the EGTS sensor if faulty (prefer OEM parts).

  2. Repair the harness:

    • Replace damaged wires and protect them with heat shielding.

  3. Eliminate exhaust leaks:

    • Weld cracks or replace faulty gaskets.

  4. Update the PCM if a TSB (Technical Service Bulletin) exists for this code.

Specific Cases

  • Diesel with DPF:

    • Prolonged EGTS sensor failure can block DPF regeneration, leading to clogging.

    • After repair, force a forced regeneration via the diagnostic tool.

  • High-mileage vehicles:

    • Check the condition of the DOC/DPF (a damaged catalyst can overload the sensor).

Important Tips

  • 🔧 Required tools:

    • Digital multimeter.

    • Manufacturer-compatible diagnostic tool.

    • High-temperature resistant degreasing spray.

  • ⚠️ Safety:

    • Work on a cold engine to avoid burns.

    • Wear gloves and safety glasses.

Post-Repair

  • Clear the P246E code and perform a road test.

  • Monitor live exhaust temperatures to confirm proper operation.

Note: If the code reappears, check the PCM’s 5V reference circuit and the sensor ground. A faulty sensor can also be a symptom of a clogged DPF.

P246F – Exhaust Gas Temperature Sensor Circuit Range/Performance, Bank 1 Sensor 4

P246F Possible Causes

  • Faulty Exhaust Gas Temperature Sensor (EGTS), Bank 1 Sensor 4
  • Exhaust Gas Temperature Sensor, Bank 1 Sensor 4 harness is open or short-circuited
  • Poor electrical connection in Bank 1 Sensor 4 Exhaust Gas Temperature Sensor circuit
  • Exhaust leaks
  • Excessive particulate buildup on the sensor

How to Fix Code P246F

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P246F

Symptoms

Possible

Check Engine Light illuminated (or Service Engine Soon warning light)

P246F Meaning

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out-of-range high values. The EGTS is located in front of the Diesel Oxidation Catalyst (DOC) and/or in front of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it to voltage, sending it back to the PCM with the voltage signal to control engine conditions for effective emission reduction. The PCM sets the OBDII code P246F when the Exhaust Gas Temperature Sensor is outside factory specifications.

P2470 – Exhaust Gas Temperature Sensor Circuit, Bank 1, Sensor 4

P2470 Possible Causes

  • Faulty Exhaust Gas Temperature Sensor (EGTS), Bank 1 Sensor 4
  • Exhaust Gas Temperature Sensor, Bank 1 Sensor 4 harness is open or short-circuited
  • Poor electrical connection in Bank 1 Sensor 4 circuit of the Exhaust Gas Temperature Sensor
  • Exhaust leaks
  • Excessive particulate buildup on the sensor

How to Fix Code P2470

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P2470 Symptoms

Possible

Check Engine Light illuminated (or Service Engine Soon warning light)

P2470 Meaning

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out-of-range high values. The EGTS is located upstream of the Diesel Oxidation Catalyst (DOC) and/or upstream of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it to voltage, sending it back to the PCM with the voltage signal to control engine conditions for effective emission reduction. The PCM sets OBDII code P2470 when the Exhaust Gas Temperature Sensor is outside factory specifications.

🚨P2471 – Exhaust Gas Temperature Sensor Circuit, Bank 1, Sensor 4

🔥 Meaning of Code P2471

The OBD-II code P2471 indicates a malfunction of the Exhaust Gas Temperature Sensor (EGTS), bank 1, sensor 4. This sensor measures the temperature of the gases before the Diesel Oxidation Catalyst (DOC) or Diesel Particulate Filter (DPF) and sends this data to the PCM (Powertrain Control Module). If the PCM detects an out-of-range value or a faulty circuit, this code is triggered.

🛑 Symptoms of Code P2471

  • Check Engine Light On ⚠️.
  • DPF Regeneration Blocked (on diesel vehicles).
  • Reduced Performance (limp mode activated).
  • Increased Fuel Consumption.

🔍 Possible Causes of Code P2471

  1. Faulty EGTS: Wear, soot buildup, or internal damage.
  2. Electrical Circuit Issue:
  • Cut or Shorted wiring.
  • Corroded, Loose, or Oxidized connectors.
  1. Exhaust Leaks: Cracks in the exhaust system skewing measurements.
  2. PCM Failure: Software or hardware malfunction (rare).

🛠️ How to Diagnose and Repair Code P2471?

1. Visual Inspection of the Electrical Circuit

  • Check the EGTS sensor’s wiring harness and connectors.
  • Look for exposed wires, bent pins, or corrosion.

2. EGTS Sensor Testing

  • Use a multimeter to measure the sensor’s resistance and voltage (refer to the manufacturer’s manual for normal values).
  • Compare with technical specifications: an out-of-range value indicates a faulty sensor.

3. Checking for Exhaust Leaks

  • Inspect the exhaust system (especially near the DOC/DPF).
  • Use smoke or soapy water to locate leaks.

4. Cleaning or Replacing the Sensor

  • Clean the sensor with a specialized product if soot buildup is light.
  • Replace the sensor if faulty (average cost: €80 to €200).

5. Resetting the PCM

  • After repair, use an OBD2 scanner to clear the code and reset the PCM.

💡 FAQ: Frequently Asked Questions

Q: Can you drive with a P2471 code?
→ A: Yes, but avoid long trips. DPF regeneration will be compromised, risking filter blockage.

Q: How much does it cost to repair a P2471 code?
→ A: Between €100 (cleaning/wiring) and €400 (sensor replacement + labor).

Q: Can the P2471 code clear on its own?
→ A: No, unless the fault is intermittent (e.g., unstable electrical connection).

📋 Estimated Cost Table

Service Cost (€)
EGTS Sensor Replacement 80 – 200
Wiring Repair 50 – 150
Professional Diagnostic 40 – 80

🚗 Conclusion: Act Quickly!

An unresolved P2471 code can damage the DPF or reduce engine efficiency. Follow these steps:

  1. Diagnose with an OBD2 scanner.
  2. Inspect the sensor and electrical circuit.
  3. Replace faulty components if necessary.

⚠️ Pro Tip: Use an electrical connector lubricant to prevent oxidation and poor contacts.

P2472 – Intermittent/Erratic Exhaust Gas Temperature Sensor Circuit, Bank 1, Sensor 4

P2472 Possible Causes

  • Faulty Exhaust Gas Temperature Sensor (EGTS), Bank 1 Sensor 4
  • Exhaust Gas Temperature Sensor, Bank 1 Sensor 4 harness is open or short-circuited
  • Poor electrical connection in Bank 1 Sensor 4 circuit of the Exhaust Gas Temperature Sensor
  • Exhaust leaks
  • Excessive particulate buildup on the sensor

How to Fix Code P2472

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P2472

Symptoms

Possible

Check Engine Light illuminated (or Service Engine Soon warning light)

P2472 Meaning

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out-of-range high values. The EGTS is located in front of the Diesel Oxidation Catalyst (DOC) and/or in front of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it to voltage, sending it back to the PCM with the voltage signal to control engine conditions for effective emission reduction. The PCM sets the OBDII code P2472 when the Exhaust Gas Temperature Sensor is outside factory specifications.

P2473 – Exhaust Gas Temperature Sensor Circuit, Bank 2 Sensor 4

P2473 Possible Causes

  • Faulty Exhaust Gas Temperature Sensor (EGTS), Bank 2 Sensor 4
  • Exhaust Gas Temperature Sensor, Bank 2 Sensor 4 harness is open or short-circuited
  • Poor electrical connection in Bank 2 Sensor 4 circuit of the Exhaust Gas Temperature Sensor
  • Exhaust leaks
  • Excessive particulate buildup on the sensor

How to Fix Code P2473

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P2473

Symptoms

Possible

Check Engine Light illuminated (or Service Engine Soon warning light)

P2473 Meaning

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out-of-range high values. The EGTS is located upstream of the Diesel Oxidation Catalyst (DOC) and/or upstream of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it to voltage, sending it back to the PCM with the voltage signal to control engine conditions for effective emission reduction. The PCM sets OBDII code P2473 when the exhaust gas temperature sensor is outside factory specifications.