P247A — Exhaust Gas Temperature Out of Range

The diagnostic trouble code P247A is a generic OBD-II (On-Board Diagnostic) trouble code indicating that the Exhaust Gas Temperature (EGT) sensor or sensor readings are outside the normal expected parameters. This typically points to a problem within the exhaust after-treatment system, especially related to emissions control components such as the catalytic converter or diesel particulate filter (DPF). It is important to note that label variations may differ between vehicle manufacturers, so always cross-reference with the specific OEM documentation where possible.

System affected: Exhaust after-treatment system
Severity: Moderate to high, depending on vehicle function and emissions compliance
Main symptoms: Reduced engine performance, warning lights, possible regeneration issues
Driveability: Limited / Yes / No (depends on severity and vehicle configuration)

Manufacturer variations for trouble code P247A

Different vehicle manufacturers may use various labels for the same diagnostic condition associated with P247A. Recognising these can aid in proper diagnosis and communication with OEM-specific diagnostic tools. Common variations include:

Ford: P247A – Exhaust Gas Temperature Sensor Circuit Range/Performance
Volkswagen / Audi / Seat / Skoda: P247A – Exhaust Gas Temperature Sensor Signal Out of Range
Mercedes-Benz: P247A – Exhaust Gas Temperature Sensor Malfunction
BMW: P247A – EGR or DPF Temperature Sensor Fault

What does trouble code P247A mean?

P247A indicates that the vehicle’s Engine Control Unit (ECU) has detected that the exhaust gas temperature sensor or sensors are providing readings outside of expected values, either too high or too low. The ECU monitors the temperature to ensure the effectiveness of emissions control systems, such as the catalytic converter and diesel particulate filter (DPF). When these readings deviate significantly from parameters, it triggers the code.

This situation can arise in various contexts, such as during active regeneration of a DPF, sensor malfunction, wiring issues, or problems within the exhaust system itself. A key point is that the ECU relies heavily on accurate temperature data to optimize emissions and protect components from overheating or damage.

Severity and risks of trouble code P247A

The severity of P247A can range from moderate to high, depending on the root cause and driving conditions. If the exhaust gas temperature is too high, components like the catalytic converter or DPF risk overheating, which can cause irreversible damage. Conversely, abnormally low readings might indicate sensor failure, poor wiring, or exhaust leaks that impair system function.

Ignoring this code could lead to increased emissions, reduced fuel efficiency, or damage to key components, ultimately affecting exhaust system integrity and vehicle lifespan. Therefore, it is advisable to address this issue promptly.

Can the vehicle be driven with code P247A? – Limited. Depending on severity and symptoms, the vehicle may be drivable temporarily, but continued operation could exacerbate damage or emissions compliance issues.

Symptoms of trouble code P247A

When P247A is active, drivers might notice several indications, reflecting underlying exhaust or sensor problems. These symptoms can include:

Reduced engine power or performance: The vehicle might enter a limp mode to protect itself.
Warning lights: Check Engine or emissions-related indicators illuminate on the dashboard.
Increased exhaust emissions: Noticeable smell or failed emissions tests.
Difficulty in DPF regeneration process: Longer or incomplete regeneration cycles.
Unusual exhaust smell or visible smoke (less common)
Potential engine overheating if related to high-temperature readings

Most likely causes of trouble code P247A

This code can stem from various issues within the exhaust temperature management system. The causes are ranked based on frequency and likelihood:

Faulty or failing exhaust gas temperature sensor(s): The sensor itself may be damaged, contaminated, or have failed wiring connections.
Wiring or connector problems:Corrosion, loose connections, or damaged wiring harness affecting sensor signals.
Exhaust system issues: Blockages, leaks, or damage causing abnormal temperature readings or sensor placement problems.
Problem with the engine’s management system or control modules: Malfunction or software issues affecting reading or interpretation of sensor data.
Overheating components or abnormal exhaust temperatures: Excessive temperatures due to DPF issues, active regeneration, or emissions system faults.

How to diagnose trouble code P247A

Diagnosing P247A requires a methodical approach to confirm the source of the abnormal readings. Here are general, non-manufacturer-specific steps:

Visual inspection: Check all wiring and connectors leading to the exhaust gas temperature sensor(s). Look for signs of damage, corrosion, or disconnection.
Scan for additional codes: Use an OBD-II scanner to identify related fault codes that could provide context.
Review live data: Observe the sensor readings during engine operation. Compare expected temperature ranges against manufacturer specifications or typical values.
Test sensor wiring continuity: Use a multimeter to verify proper electrical continuity in the sensor wiring harness.
Check for exhaust leaks or damage: Visually inspect the exhaust system, especially near the sensor location.
Perform sensor replacement or re-calibration if necessary: If the sensor appears damaged or the readings are inconsistent, replace and clear codes.
Evaluate the overall exhaust system operation: Ensure no blockages, leaks, or other issues affecting the temperature readings.

Possible repairs for trouble code P247A

Repair strategies depend on the root cause identified during diagnostics. Common remedial actions include:

Replacing the faulty exhaust gas temperature sensor: A simple repair, usually carried out by a professional mechanic.
Repairing or replacing damaged wiring or connectors: Restores proper electrical connection and signal integrity.
Addressing exhaust system issues: Repair or replace damaged pipes, joints, or the entire exhaust system if blocked or leaking.
Cleaning or replacing the DPF or catalytic converter: If these components cause abnormal temperatures due to clogging or damage.
Updating or re-flashing the ECU software: When a software glitch is suspected to affect sensor readings (professional service required).

Vehicles commonly associated with trouble code P247A in Europe

This code appears across various vehicle brands, but certain models and engine families are more frequently affected. Typical affected vehicles include:

Volkswagen Group (VW, Audi, Seat, Skoda): Various diesel models equipped with particulate filters and exhaust temperature sensors.

Ford: Certain diesel vehicles with advanced emissions control systems.

Mercedes-Benz: Diesel models with complex exhaust after-treatment systems.

BMW: Diesel models with integrated exhaust sensors related to DPF and EGR systems.

Frequent mistakes with trouble code P247A

Diagnosing and repairing this fault accurately can be complicated. Common mistakes include:

Assuming the sensor is always faulty without verification: Replacing sensors prematurely can lead to unnecessary repairs.
Ignoring wiring or connection issues: Faulty wiring is often overlooked but can cause sensor reading anomalies.
Neglecting exhaust system inspection: Overlooking leaks, damage, or blockages that affect temperature readings.
Failing to clear codes after repairs: Symptoms may persist if residual codes are not cleared and verified.

FAQ — trouble code P247A

Can this code disappear on its own?

In some cases, transient issues such as minor wiring disturbances or temporary sensor glitches might resolve themselves after a few drive cycles. However, persistent or recurring P247A typically requires proper diagnosis and repair.

Can I keep driving?

The vehicle can often be driven with P247A, but this is not recommended for extended periods. It may lead to increased emissions, potential damage to the exhaust system, or engine protection modes limiting performance. Therefore, it’s best to address the problem promptly.

Why does the code return after clearing?

If the root cause, such as a faulty sensor or wiring, is not fixed, the code will likely reappear after being cleared. Persistent readings outside recommended parameters are a sign that repair or replacement is necessary.