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Check engine light is on. error reads PO128 and

Check engine light is on. error reads PO128 and PO 405

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Hi 128 is coolant temp below regulating temp 405 is










hi 128 is coolant temp is below regulting temp 405 is































































































































hi 128 is coolant is below regulating temp 405 is<erg/swsr/ckt low> hope this helps please rate this answer












Posted on Nov 20, 2009

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Pontiac grand am I had a diagnostic reading at autozone for diagnostic codes po128,po440 and p1189 don&#39;t know what they mean for a 2003 Pontiac grand am gt 3.4 liter and v6 engine vehical


PO128 -- engine coolant low or thermostat not working
P0440 - EVAP system malfunction, gas cap loose - Cat convertors missing from car can cause this
P1189 - Engine Oil Pressure Switch Circuit -- CAT CONVERTORS MISSING FROM CAR can cause this.

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2004 buick rainer, po128 pending has heat the check engine light comes on and goes out temp is 195


PO 128 is a coolant temperature beyond threshold code. It means your thermostat is stuck and needs to be replaced.

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03gmc envoy showing code p1514 and reduced power light on engine shuts down


Type: OBD & your codes

OBD PO 440
OBD PO128

Codes have nothing to do with installing parts

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Check engine light


When you begin the scan, does the scanner tell you the MIL is on ?

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2004 trailblazer code po128


P0128:
P0128 OBD-II Trouble Code
Technical DescriptionCoolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

What does that mean?This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

CausesA code P0128 may mean that one or more of the following has happened:

Low engine coolant level .
Leaking or stuck open thermostat .
Faulty cooling fan (running too much) .
Faulty coolant temperature (ECT) sensor.
Faulty intake air temperature (IAT) sensor .Here's a link on replacing your thermostat.

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How do I turn off check engine light after fuel sensor code Po 193


After the problem is fixed and the code is erased with a scanner or code reader, the light should stay off.

Feb 04, 2013 | 2005 Mazda Tribute

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Engine light came on while driving on highway for 30 minutes


po128 cooling system preformance, this can be caused by a bad thermostat or fan relay, if the fans are staying on to long and last a bad coolant temp sensor, this car uses two coolant temp sensors, the best way would be with a scan tool to watch the sensor values and see if there are ok, this being a 2009 honda with 32,000 miles , this type of problem is not seen to often. check connections to sensors and make sure wiring is ok,

Jan 16, 2013 | Honda Accord Cars & Trucks

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Po128 code on 2002 kia rio


it mite be a o2 cencer

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Getting codes PO431, PO421, PO128


2003 saturn vue, we dont have the engine size, the codes should be and are the same, po 128 means; cooling temp is out of spec, make sure the coolant is full, then replace the coolant emp sensor and make sure the connection is good, i would also replace the thermostant, this is a common code on these and most of the time its the coolant temp sensor or thermostant, ive learned to replace then both to avoid future engine lights with code po128. next we will check the code # po421, this code is that the computer sees that the cat converters are taking to long to warm up, code po 431 is also the same as po421, this code is related to the thermostant and sensor, the sensor give the computer the wrong temp readings and then the compuetr thinks the engine is hotter than it is and thinks the converters should be also hot like the motor but the coolant temp is giving a false reading, if you replace the coolant temp sensor and the thermostant and fill coolant , then reset the light and you will solve the problem, i hope this is helpful, also the sensor is located to the right of the engine if you are standing in front of the motor, heres a picture of the sensor, remember to check connector heres a pic of the connector, good luck.johnjohn2_20.jpg

Nov 10, 2010 | 2003 Saturn VUE

1 Answer

What is error code po 304 and po316


P0304 is Cylinder 4-misfire detected-probable cause is as follows. Engine mechanical fault, wiring, ignition/fuel system, injector, ECT/MAF sensor, ECM

P0316 Misfire detected during startup-first 1000 revolutions- probable cause is as follows-Engine mechanical fault, wiring, ignition/fuel system, injector

Aug 18, 2009 | 2003 Mercury Sable

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