P0128: what does this code mean?

Thermostat: regulating temperature not reached

Parts to check, to be confirmed by diagnosis

1. ThermostatSearch for my vehicle
2. Coolant temperature sensorSearch for my vehicle

Good to know: Most often a thermostat stuck open.

A code points to a circuit or a function, not a part number: confirm by diagnosis before ordering.

Nearby codes:P0127

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