🔥 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
- Faulty EGTS: Wear, soot buildup, or internal damage.
- Electrical Circuit Issue:
- Cut or Shorted wiring.
- Corroded, Loose, or Oxidized connectors.
- Exhaust Leaks: Cracks in the exhaust system skewing measurements.
- 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:
- Diagnose with an OBD2 scanner.
- Inspect the sensor and electrical circuit.
- Replace faulty components if necessary.
⚠️ Pro Tip: Use an electrical connector lubricant to prevent oxidation and poor contacts.