Last post on Oct 27, 2013 at 11:55 AM
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Mazda MAZDA3, Engine, Hatchback
#63 of 101 Engine light on code PO128
Nov 17, 2009 (10:09 am)
We just purchased a 2004 Mazda 3 and the engine light came on yesterday.
The code was the same as yours: PO128
Coolant thermostat condition- low operating temperature
open or short circuit condition
faulty ECT sensor
Car drives great and shows no problems at all.
Any one else have this problem or any advice?
#64 of 101 Re: Engine light on code PO128 [cactus6]
by MrShift@Edmunds HOST
Nov 17, 2009 (10:56 am)
well you have to take in it and have it tested to isolate the cause. A bad ECT sensor isn't so bad, but a sticking thermostat could be dangerous to your engine's health.
#65 of 101 2004 3s belt problems
Nov 18, 2009 (10:53 am)
i have a 2004 Mazda3 with 40000 miles on it. was driving home stoped at a light. started out then a noise started sounded like a baseball card in the spokes of a bike. it sounds like the noise is coming from the top pulley witch looks to be a fixed pulley. dose anyone know more about this thank you for any help.
#66 of 101 Re: Engine light on code PO128 [cactus6]
Dec 01, 2009 (7:05 pm)
theres is a reflash to correct this problem there is no part replacement needed the only thing is this is covered by the power train warrenty which is 5 years or 100,000kms (60,000miles) this is a dealer concern. hope this helps
by mazda tech
#67 of 101 Re: Engine light on code PO128 [abdmazza]
Dec 02, 2009 (8:49 am)
I am sorry for asking dumb questions here ... I don't know anything about cars.
What is a reflash?
Does this mean there is a power train problem?
Thanks for your help!!!
#68 of 101 Re: Engine light on code PO128 [cactus6]
Dec 02, 2009 (3:44 pm)
"Reflash" is similar to a reset of your computer. Normally not a big deal.
#69 of 101 Re: Engine light on code PO128 [Mr_Shiftright]
Apr 01, 2010 (3:50 pm)
My problem is the oposite. Temp is up to the "red". Took it to Autozone. They sugested to replace the MAFsensor ($170.00). Replaced it, didn't work. Item # 2, Replaced the Coolant Sensor($26.00). Still didn't worked. I'm in the process of replacing the Thermostat ($30) at this very moment. This will be the second time I replaced. First time was at 70k and now I've 92k. More to follow...
What should I do to ensure the engine hasn't suffer damaged? What signs should I be on the look out for?
#70 of 101 Re: 2004 Mazda 3 ECT Sensor [cactus6]
Nov 29, 2010 (4:26 pm)
I had this problem with my Ford ZX2, all you need to do is replace the thermostat and it is realitivly cheap and easy enough to do yourself if you have instructions.
#71 of 101 Re: Which Spark Plug for a 2004 Mazda 3i 2.0l? [mmitsch]
Dec 27, 2010 (8:07 am)
But why did u change the spark plug ? was there any issue with it ? if not u should have left it as it is.. however Bosch plugs too are reliable.. i hope it gives no hiccups.