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P0125
2016 BMW 328i
BMW
Severity
Low
Safe to Drive
Yes
Est. Time
1hr
Difficulty
Moderate
SYMPTOM
Heater slow to warm up, fuel economy slightly reduced
Why This Happens
A stuck-open thermostat keeps the engine running cooler than the ECU expects, delaying closed-loop fuel control.
VERIFIED FIX:
Thermostat replaced
How It Was Diagnosed
A stuck-open thermostat keeps the engine running cooler than the ECU expects, delaying closed-loop fuel control.
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