Diagnostic article Generic OBD-II
P247B: Ford exhaust-temperature sensor 4 upper-range fault
Ford P247B records an engineering temperature above the monitored range for exhaust gas temperature sensor 4.
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Documented application
Ford 2015 model-year diesel OBD system operation summary, revision December 22, 2014; the cited monitor only, without blanket model or engine applicability.
The code alone does not identify a failed part or establish that a vehicle is safe to drive. Confirm the vehicle, reporting module and applicable service procedure.
P247B is exhaust-temperature sensor 4 out of range in Ford's documented 2015 diesel system. The out-of-range check is explicitly high-side only and typically uses 1,150°C as its boundary. It is a temperature-domain evaluation, distinct from the sensor's electrical voltage limits.
Do not substitute another sensor 4 test
P2470 and P2471 identify electrical low and high conditions. Separate rationality codes compare the sensor with modeled or other measured temperatures. P247B retains a different question: has the interpreted temperature exceeded the engineering range?
Ford lists continuous execution, a typical two-second duration, key-on and battery voltage between 9 and 16.25 volts. These conditions differ from the long-soak prerequisites used for cold-start comparisons.
Establish what the high reading represents
Confirm sensor 4's location for the actual exhaust configuration, and preserve the reading with other temperature and circuit faults. The code alone cannot prove either a real thermal event or a failed sensing element. The source's description of possible EGT applications does not locate every sensor on every engine. Follow the applicable diagnostic procedure, with safe handling of hot exhaust components, before selecting a sensor or aftertreatment repair.
Source and applicability
Ford 2015 model-year diesel OBD system operation summary, revision December 22, 2014; the cited monitor only, without blanket model or engine applicability. Ford source, physical PDF pages 128, 129. The documented monitor explains the fault decision; vehicle-specific service information is still needed for connector identification and a complete repair procedure.
Article source documents
Source checks describe how the text was prepared; they do not certify a diagnosis or confirm compatibility with every vehicle using this code.
Original code reference
Dictionary definition
Exhaust Gas Temperature Out of Range Bank 1 Sensor 4
This definition retains its original catalog scope. The article above is limited to its explicitly documented application.
Reference scope
Generic OBD-II definition.
A manufacturer label does not establish the model, year, engine or module to which a diagnosis applies. Read the safety and diagnostic limits.
Definition source
- DTC Database: pinned community code definitions
Source checked · MIT