MAZDA · 2022-05-13
Some customers may experience the CHECK ENGINE light ON at idle with DTC P22FB:00 [DCU] and P1640:00 [PCM] stored in memory. *P22FB:00 [DCU]: NOx sensor No.1: On-board diagnostics canceled *P1640:00 [PCM]: Powertrain DTCs available in dosing control unit This is caused by a false malfunction detection occurring under certain conditions. To eliminate this concern, the detection condition of DTC P22FB:00 has been changed.