Last Updated on October 11, 2026
If your OBD2 scanner displays a P246F code, your vehicle has detected a performance problem with the Exhaust Gas Temperature (EGT) Sensor on Bank 1, Sensor 4. This sensor monitors exhaust temperatures and helps the engine computer manage the emissions control system.
The problem is most relevant to diesel vehicles equipped with an exhaust aftertreatment system, including a Diesel Particulate Filter (DPF). If the sensor sends incorrect temperature information, the vehicle may have trouble managing certain emissions functions.
However, P246F doesn’t automatically mean the EGT sensor or DPF needs replacing. Damaged wiring, a poor electrical connection, or another related problem can produce similar symptoms.
This guide explains what the P246F code means, the common symptoms and causes, how to diagnose it, and the best ways to fix it without unnecessary repairs.
What Does the P246F Code Mean?
P246F means Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 4). It appears when the Powertrain Control Module (PCM) detects that the sensor’s temperature reading isn’t behaving as expected.
The PCM monitors exhaust temperature information to help manage engine and emissions functions. On diesel vehicles, these readings are particularly important during DPF regeneration, when exhaust temperatures may rise significantly.
A range/performance code differs from a simple circuit-high or circuit-low fault. The sensor may still produce a signal, but that signal may change too slowly, remain implausible, or fail to match the expected operating conditions.
For example, on certain Ram diesel engines, P246F can be triggered when the Bank 1 Sensor 4 temperature reading fails to rise appropriately after engine startup.
If you’re researching other EGT problems, our guide to P242B exhaust gas temperature sensor performance issues covers a similar fault involving Bank 1, Sensor 3.
Updated Insight for 2027
Modern diesel emissions systems rely on several temperature and pressure measurements to control exhaust aftertreatment. The exact number and location of these sensors vary by manufacturer and engine.
For diagnosing P246F, the important step is identifying Bank 1 Sensor 4 correctly and comparing its readings with manufacturer specifications.
There is no universal mileage at which this sensor starts failing. Heat exposure, wiring condition, corrosion, and individual sensor wear can all affect its lifespan.
Quick Causes of the P246F Code
- Faulty or degraded Exhaust Gas Temperature Sensor (Bank 1 Sensor 4)
- Damaged, melted, or corroded sensor wiring
- Loose electrical connectors or poor circuit connections
- Incorrect or unusually slow temperature response
- Exhaust leaks or aftertreatment problems affecting readings
- PCM software or internal faults in less common cases
Where Is the Exhaust Gas Temperature Sensor Located?
The EGT sensor monitors exhaust temperature at a specific point in the exhaust system.
Bank 1 Sensor 4 refers to the fourth designated exhaust temperature sensor on Bank 1. Its exact location depends on how the manufacturer numbers the sensors.
On many diesel vehicles, it is positioned in the exhaust aftertreatment system, often around or downstream of the DPF. On other designs, its location may differ.
Don’t assume Sensor 4 is always the last sensor near the tailpipe. Use the vehicle’s service manual or a manufacturer-specific parts diagram to confirm its position.
How the EGT Sensor Works
Many EGT sensors use a temperature-sensitive resistor called a thermistor.
As exhaust temperature changes, the sensor’s electrical resistance changes. The PCM interprets the resulting signal to estimate exhaust temperature.
During certain operating conditions, especially DPF regeneration, these measurements help the system manage exhaust temperatures safely.
If the sensor reading doesn’t change as expected, the PCM may store P246F.
What Are the Symptoms of the P246F Code?
The symptoms depend on the vehicle and the severity of the fault. Some drivers may notice only a warning light, while others experience emissions-related restrictions.
1. Check Engine Light
The Check Engine Light is usually the first indication. P246F may be stored even when the engine appears to run normally.
2. Reduced Engine Power
Some diesel vehicles may limit power when exhaust temperature information becomes unreliable.
This depends on the manufacturer’s protection strategy and whether other faults are present.
3. DPF Regeneration Problems
Incorrect EGT readings can interfere with active DPF regeneration on certain vehicles.
If regeneration is repeatedly prevented, soot may accumulate and eventually cause additional DPF-related warnings.
4. Increased Fuel Consumption
Fuel economy may decrease if the underlying problem affects aftertreatment operation or results in repeated, unsuccessful regeneration attempts.
However, higher fuel consumption isn’t guaranteed with every P246F fault.
5. Additional Warning Lights or Codes
Some vehicles may display a DPF warning or store related temperature sensor and emissions codes.
Heavy smoke, repeated stalling, and severe engine vibration are not typical signs of an isolated P246F fault. These symptoms require broader diagnosis.
What Causes the P246F Code?
1. Faulty EGT Sensor
Internal sensor damage, aging, and repeated exposure to high temperatures can affect its response.
A sensor may still report a temperature but respond too slowly or inaccurately as exhaust conditions change.
2. Damaged Wiring Harness
EGT sensor wiring operates near extremely hot exhaust components.
Common problems include melted insulation, broken wires, loose connections, and corrosion inside connectors.
These faults can interrupt or distort the electrical signal.
3. Poor Electrical Connections
A connector with excessive resistance may cause intermittent or implausible readings.
Moisture, vibration, and terminal damage can contribute to the problem.
4. Exhaust System Problems
Exhaust leaks or unusual aftertreatment conditions may affect temperature behavior.
A clogged DPF can also cause separate performance problems, but P246F alone doesn’t prove that the filter is blocked.
5. PCM Problems
Software or control module problems are possible but less common.
Check the sensor, wiring, and related circuits before considering PCM programming or replacement.
How to Diagnose the P246F Code
Diagnosing the P246F code starts with a complete scan and a careful review of the sensor’s behavior.
Step 1: Scan and Record Trouble Codes
Use a compatible OBD2 scanner to read stored and pending codes.
Record P246F, related EGT codes, and any DPF or emissions-system faults before clearing anything.
Freeze-frame information may help identify the operating conditions when the fault occurred.
Step 2: Check EGT Live Data
With a scanner that supports manufacturer-specific EGT readings, locate Bank 1 Sensor 4.
After the vehicle has been parked long enough for the exhaust to cool, compare its initial temperature with other available exhaust and ambient temperature readings.
The readings should be reasonably consistent with actual conditions, allowing for sensor location and temperature differences.
Then monitor how the reading changes during the manufacturer’s approved test procedure.
For more help with scanner measurements, see our guide to understanding live data from OBD2 scanners.
Step 3: Inspect the Sensor and Wiring
Allow the exhaust system to cool completely before touching any components.
Check for:
- Damaged or melted wiring
- Loose electrical connectors
- Corroded terminals
- Broken sensor mounting components
- Exhaust leaks near the sensor
Repair obvious electrical problems before replacing the sensor.
Step 4: Test the EGT Sensor
Some EGT sensors can be checked by measuring resistance at a known temperature. Others require more specific testing.
Use the manufacturer’s wiring diagram and specifications to identify the correct test terminals.
If the diagnostic procedure requires checking how the reading changes with temperature, follow the approved method.
Never use an open flame to heat the sensor. Incorrect heating can damage it or create a fire risk.
Step 5: Inspect the DPF System if Necessary
If additional codes or live data suggest a DPF problem, check the relevant differential pressure and temperature readings.
Don’t attempt forced regeneration simply because P246F is stored.
Forced regeneration involves very high exhaust temperatures and should only be performed when the manufacturer’s conditions are satisfied.
Step 6: Check Software and Service Bulletins
If the sensor and wiring test correctly, check for applicable Technical Service Bulletins.
Manufacturer-approved software updates may address certain vehicle-specific faults, but reprogramming isn’t a universal repair for P246F.
How to Fix the P246F Code
Once the failed component or circuit is identified, choose the appropriate repair.
1. Replace the Faulty EGT Sensor
If testing confirms that Bank 1 Sensor 4 has failed, replace it with a compatible part.
Confirm the sensor location and part number before purchasing. Different EGT sensors on the same vehicle may not be interchangeable.
2. Repair Wiring and Connectors
Repair broken or heat-damaged wiring using suitable high-temperature automotive wiring methods.
Replace corroded connectors when necessary and keep the harness secured away from exhaust components.
3. Repair Exhaust Leaks
If a confirmed exhaust leak is affecting the sensor’s readings, repair the damaged pipe, gasket, or connection.
4. Address Related DPF Problems
If separate testing identifies excessive soot loading or another DPF fault, follow the manufacturer’s diagnostic procedure.
The DPF should not be cleaned or replaced based on P246F alone.
5. Clear the Code and Verify the Repair
After completing the repair, clear the stored code and perform the applicable verification test.
Monitor EGT Sensor 4 data and confirm that it responds normally.
If the vehicle is safe to drive, a road test may be appropriate. Some faults require specific operating conditions before the diagnostic monitor runs again.
Related Diagnostic Trouble Codes
| Code | Meaning |
|---|---|
| P246E | Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 4) |
| P246F | Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 4) |
| P2470 | Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 4) |
| P2471 | Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 4) |
| P2472 | Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic (Bank 1 Sensor 4) |
These codes describe different electrical or performance conditions. If more than one appears, investigate them together using vehicle-specific diagnostic information.
How Much Does It Cost to Fix P246F?
The cost depends on the failed component, vehicle design, and local labor rates.
The following are broad U.S. repair-budget estimates, not confirmed quotes.
| Repair or Service | Estimated Cost (USD) |
|---|---|
| Diagnostic Inspection | $100–$200+ |
| EGT Sensor Replacement | $150–$450+ |
| Wiring or Connector Repair | $100–$400+ |
| Exhaust Leak Repair | $100–$600+ |
| PCM Software Programming | $150–$350+ |
| DPF Repair or Replacement, if separately confirmed | $500–$3,000+ |
Actual costs can be higher for difficult-to-access sensors or complex diesel aftertreatment systems. Only approve repairs supported by diagnosis.
Can You Drive With the P246F Code?
Short-distance driving may be possible if the engine operates normally, there are no severe emissions warnings, and the vehicle hasn’t entered reduced-power mode.
However, the code should be diagnosed promptly, especially if DPF regeneration is affected.
If the vehicle loses significant power, displays a serious exhaust temperature warning, or develops other severe symptoms, stop driving when safe and seek professional assistance.
Don’t attempt to force regeneration or continue driving simply to clear the warning light.
Common Mistakes When Diagnosing P246F
- Replacing the DPF Immediately: P246F primarily identifies an EGT sensor circuit performance fault.
- Assuming the Sensor Is Bad: Wiring and connector faults can cause similar readings.
- Using Universal Resistance Values: Different sensor designs require different specifications.
- Ignoring Related Codes: Low, high, or intermittent circuit faults may provide important clues.
- Performing Forced Regeneration Too Early: An unresolved sensor fault may make the procedure unsafe or unsuccessful.
- Replacing the PCM Without Testing: Module failure should be considered only after completing the appropriate checks.
Frequently Asked Questions About the P246F Code
1. What does the P246F code mean?
P246F means Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 4). The PCM has detected that the sensor’s temperature signal isn’t behaving as expected.
2. Can I drive with a P246F code?
Limited driving may be possible if the vehicle operates normally. However, the fault should be diagnosed promptly because it may interfere with emissions-system operation on some diesel vehicles.
3. Does P246F mean my DPF is clogged?
No. P246F primarily concerns EGT sensor performance. DPF clogging may be a separate issue, but the code alone doesn’t prove that the filter is blocked.
4. How much does it cost to fix P246F?
An EGT sensor replacement may cost approximately $150–$450 or more in the U.S. Wiring repairs and other related problems can change the total cost.
5. Can cold weather trigger P246F?
Cold-start conditions can be part of certain manufacturer diagnostic tests. However, cold weather alone doesn’t prove the sensor is defective. The PCM must detect a performance issue under its programmed conditions.
6. Will replacing the EGT sensor always fix P246F?
No. Replacement will help only if the sensor is responsible. Damaged wiring, electrical connections, or other vehicle-specific problems may also need repair.
Final Thoughts on the P246F Code
The P246F code indicates a performance problem involving Exhaust Gas Temperature Sensor Bank 1, Sensor 4. Although this sensor supports important exhaust monitoring functions, the code doesn’t automatically mean the DPF or PCM has failed.
Begin with a complete scan, review the sensor’s live temperature readings, and inspect the wiring and connectors. If testing confirms a defective sensor, replace it with the correct part and verify that the readings return to normal.
A careful diagnosis can help protect the emissions system and prevent unnecessary repair costs.