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Engine-Codes.com | All About OBDII Engine Codes

P0128 Mazda

P0128 Mazda - Coolant Thermostat Malfunction

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P0128 Mazda Comments |  Add Comment
Possible causes
- Leaking or stuck open thermostat
- Low engine coolant level
- Insufficient warm up time
- Faulty engine coolant temperature sensor
- Engine coolant temperature sensor harness is open or shorted
- Engine coolant temperature sensor circuit poor electrical connection
What does this mean? What does this mean?
Tech notes
There is a service bulletin for the following Mazda models:

2004-2005 Mazda3 vehicles
2006-2007 Mazda5 vehicles
Mazda Factory Service Bulletin OBDII Code P0128
What does this mean? What does this mean?
When is the code detected?
The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0128 Mazda Description

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.

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MAZDA Technical Service Bulletins for P0128 code
2004 MAZDA MAZDA3 Electrical System Details
2005 MAZDA MAZDA3 Electrical System Details
2004 MAZDA RX8 Electrical System Details
What does this mean? What does this mean?
Repair Shops Around Your Area
4x4 Land LLC
Chantilly, VA
(703) 263-3307
A & G Car Care
Chantilly, VA
(703) 378-2005
A & J Automotive
Centreville, VA
(703) 817-9880
See More...
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