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March 11, 2020 Service bulletin

Some customers may experience the CHECK ENGINE LIGHT ON with DTC P0126:00 (Thermostat stuck open) and one...

Mazda technical service bulletin SA-035-20a for 2018-2020 Mazda CX-5 and 2018-2020 Mazda MAZDA6.

Bulletin number
SA-035-20a
Component
Engine and engine cooling
Summary
Some customers may experience the CHECK ENGINE LIGHT ON with DTC P0126:00 (Thermostat stuck open) and one or more of the following symptoms:  The engine takes longer to warm up.  The engine temperature gauge fluctuates.  The low coolant temperature indicator (blue) light stays on longer or comes on while driving.  Poor heater performance, especially at idle.

Owners of these vehicles have filed 376 complaints in the engine category.

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