Powertrain, generic (extended)

P2479 Exhaust Gas Temperature Out of Range (Bank 1 Sensor 2)

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2479 applies the same temperature-limit idea to the second bank 1 probe. On the 2015 Ford 6.7L layout this is EGT12 at the oxidation catalyst outlet, where the exotherm of a regeneration shows up first, so a runaway burn or excessive post-injection can push the reading towards the limit. Ford's 2015 diesel summary lists P2479 alongside P2032 and P2033 and uses a high-side threshold of about 1150 °C; the 2023 edition no longer carries it. No other maker documents the code publicly. When the code appears together with circuit faults of the same probe, fix those first; on its own it calls for a check of injection and regeneration behaviour.

Likely causes

Excessive heat during regeneration, e.g. too much post-injection

Leaking injector adding unburnt fuel to the catalyst

Probe reading too high

Symptoms

MIL on
Regeneration aborted
Reduced power

Repair estimate

DifficultyHardWorkshop job

Parts and labour€50–1,500

Time0.5–4 h

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

Parts involved

egt sensor b1s2

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