What Does P247B Mean?
The exhaust gas temperature at Bank 1, Sensor 4 (typically post-DPF outlet) is out of range. This is the final monitoring point for exhaust temperatures and DPF exit conditions.
Common Causes
40%
Defective EGT sensor at position 4
25%
DPF complete failure or meltdown affecting downstream temps
20%
Sensor wiring damaged by heat or physical wear
10%
Exhaust leak downstream of DPF
5%
Sensor contamination or mounting issues
Diagnostic Steps
1
Step 1: Compare sensor 4 readings with sensor 3 to verify temperature differential across DPF
2
Step 2: Inspect sensor location for exhaust leaks and physical sensor condition
3
Step 3: Test sensor electrical values and compare to specifications
4
Step 4: Check wiring routing for heat damage near exhaust components
5
Step 5: Evaluate overall DPF system health with differential pressure and regeneration data
Estimated Repair Cost
$180 - $2,800
Parts + labor, varies by vehicle and location
The exhaust gas temperature at Bank 1, Sensor 4 (typically post-DPF outlet) is out of range. This is the final monitoring point for exhaust temperatures and DPF exit conditions.
The most common cause of P247B (Exhaust Gas Temperature Out of Range Bank 1 Sensor 4) is: Defective EGT sensor at position 4
Typical repair costs for P247B range from $180 to $2,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe for limited driving but may indicate serious DPF issues. Can result in engine derate or shutdown if DPF protection systems activate.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P247B to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
