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2001 Pontiac Bonneville is showing P0128, What Do I check, what parts does it involve?

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2001 Pontiac Bonneville is showing P0128, What Do I check, what parts does it involve?

Vehicle: 2001 Pontiac Bonneville

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Usually the problem is the thermostat.

P0128 PONTIAC - Engine Coolant Temperature Below Thermostat Regulating Temperature

Read more: https://www.autocodes.com/p0128_pontiac.html

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