DTC codes / P21xx · Fuel and air metering / P214D
P214D means the engine computer has detected that the selective catalytic reduction (SCR) system's nitrogen oxide (NOx) catalyst outlet temperature climbed too high while the diesel particulate filter (DPF) was actively regenerating. The computer compares the outlet temperature sensor reading against a calibrated limit and sets this code when the exhaust gas exiting the SCR catalyst is hotter than it should be during that regeneration event.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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