Some customers may experience a check engine light ON with DTC P0126:00 (Thermostat stuck open) and one or...
Mazda technical service bulletin 01-003-25b for 2019-2023 Mazda MAZDA3, 2018-2025 Mazda CX-5 and 2018-2021 Mazda MAZDA6 and others.
- Bulletin number
- 01-003-25b
- Component
- Engine
- Summary
- Some customers may experience a check engine light ON with DTC P0126:00 (Thermostat stuck open) and one or more of the following symptoms: Engine takes longer to warm up. • Engine temperature gauge fluctuates. • Low coolant temperature indicator (blue) light stays on longer or turns on while driving. • Poor heater performance, especially at idle. • This concern may be caused if the coolant control valve fail-safe thermostat opens at a temperature lower than the normal temperature due to a deformation of the thermostat diaphragm. To eliminate the concern, the water flow control valve specification has been modified.
Owners of these vehicles have filed 612 complaints in the engine category.
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