Powertrain, generic (extended)

P247B Exhaust Gas Temperature Out of Range (Bank 1 Sensor 4)

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P247B concerns the last probe in the bank 1 chain. In Ford's 2015 6.7L overview that is EGT14, mounted downstream of the particulate filter, so it sees the heat that leaves the filter during regeneration. Ford's 2015 diesel summary is the only public maker document with this code; it pairs it with P2470 and P2471 and apply the same high-side limit of about 1150 °C, monitored continuously over some 2 s. The 2023 summary checks probe 4 against a model (P246E) instead. A real reading near the limit at the filter outlet hints at a thermal runaway in the filter, which can crack the substrate, so the vehicle should be inspected promptly.

Likely causes

Thermal runaway in the particulate filter

Probe reading too high

Unburnt fuel reaching the filter from injectors or a dosing valve

Symptoms

MIL on
Regeneration stopped, filter load warning possible
Power reduction

Repair estimate

DifficultyHardWorkshop job

Parts and labour€50–2,500

Time0.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egt sensor b1s4

References: fordservicecontent.com, fordservicecontent.com, law.cornell.edu.