What does code P22FF mean?

Q: What does code P22FF mean?

SCR NOx Catalyst Inlet Temperature Too Low. P22FF means the engine computer has determined that the selective catalytic reduction (SCR) catalyst inlet temperature is too low for the system to reduce nitrogen oxides (NOx) properly. The computer compares the measured exhaust temperature at the SCR inlet against the minimum threshold needed for the catalyst to work, and it sets this code when the reading stays below that threshold longer than expected.

DTC codes / P22xx · Fuel and air metering (injector circuits) / P22FF

P22FFSCR NOx Catalyst Inlet Temperature Too Low

P22FF means the engine computer has determined that the selective catalytic reduction (SCR) catalyst inlet temperature is too low for the system to reduce nitrogen oxides (NOx) properly. The computer compares the measured exhaust temperature at the SCR inlet against the minimum threshold needed for the catalyst to work, and it sets this code when the reading stays below that threshold longer than expected.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.