Powertrain, generic (extended)

P2474 Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 2 Sensor 4)

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2474 flags a plausibility problem: the electrical signal of bank 2 probe 4 is valid, yet the temperature it reports does not fit what the engine controller expects. Typical tests compare the probe with its neighbours after a long soak, when all should read about ambient, or with a modelled value during driving. Ford handles the bank 1 analogue P246F as a sensor-to-sensor check on its single-bank diesels; for the second bank no maker publishes P2474. CARB requires rationality monitoring for exhaust temperature inputs that feed emission strategies. A skewed probe can start or block regeneration at the wrong time, so the driver may notice higher fuel use or a regeneration that never completes.

Likely causes

Probe aged and reading off by a constant amount

Soot-coated probe tip reacting slowly

Exhaust leak upstream of the probe falsifying the reading

Symptoms

MIL on after repeated detection
Probe 4 of bank 2 differs clearly from the other probes after a cold soak
Regenerations incomplete or more frequent

Repair estimate

DifficultyMediumDIY possible

Parts and labour€40–350

Time0.3–1.5 h

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

Parts involved

egt sensor b2s4

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