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Old 12-01-2008, 12:53 PM   #1
Ler0y Jenkins
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Service Engine Soon Light Came On... Reading a P0128 Code??

I have a 2002 325i with 103k miles. About two months ago (September or October), I noticed that the coolant light would come on in the mornings and then turn off in the afternoons. The level was a little low so I bought some distilled water and topped off the tank. I've read that this can be caused from the drop in outside air temperatures around that time of the year so I didn't think anything of it.

The coolant light has not been on since but this morning on my way to work, the service engine soon light came on and stayed on. I went to Autozone and it's reading a P0128 error code. It is blowing hot air out of the heater and the engine is operating at normal temperature.

I've done some research and it seems replacing the thermostat and coolant temperature sensor is standard operating procedure. I plan on doing this (along with a coolant change) this weekend. My question is, can I continue to drive the car until then or should I park it and wait to repair the thermostat? If I just keep my eye on the temperature gauge I should be fine, right?? Also, what other parts should I consider replacing and where's the best place to order from?

Thanks,

Kevin
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Old 12-01-2008, 04:02 PM   #2
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wtf...my ses light came on this morning and i took it to autozone and they told they dont scan codes anymore. They can only sale me the scan tools....
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Old 12-01-2008, 04:05 PM   #3
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well, they are a good tool to have around. Pick one up on amazon, then you can reset the codes after you fix the problem. Also check out bimmertools, Ken sells top notch stuff.
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Old 12-01-2008, 04:05 PM   #4
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Its probably not the sensor...I'm 99% sure its the thermostat. I had that same code on mine. I drove mine for like 3 months like that. You thermostat is stuck open because if it wasn't then it would run hot and it sounds like your is doing just what mine did. You sould be fine though. Shouldn't take you more than an hour to change the t-stat
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Old 12-01-2008, 04:09 PM   #5
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the coolant system is not the strongest point in the e46.
At your mileage, I would recommend changing the water pump, thermostat, hoses and fluid. Check your expansion tank too. I personally have not had problems with the sensor, it is probably just the thermostat. The thermostat is likely just stuck open.

Change your stuff, then don't overfill the system, that's what generally causes a burst expansion tank. remember to bleed the air out.
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Old 12-01-2008, 07:48 PM   #6
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keep us updated please....
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Old 12-01-2008, 10:23 PM   #7
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Thanks for the referral David!

For those considering purchasing a scan tool to use with your BMW, please read the "Check Engine Light On?" article in my signature. There, you'll find a descriptive outline of the differences between generic OBDII tools (like Autozone uses and sells) and BMW-Specific readers.

[email protected] if you have any questions.

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Old 12-02-2008, 07:00 AM   #8
Ler0y Jenkins
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Quote:
Originally Posted by e46vert View Post
wtf...my ses light came on this morning and i took it to autozone and they told they dont scan codes anymore. They can only sale me the scan tools....
Yeah, well the guy was a dick about it. I called ahead and the guy I talked to was really nice and said come on in. I got there and about four people walked in behind me. I went to the counter and said I need an error code read. The guy acted all put out and made me wait while he took care of the people who came in behind me

Anyway, you should try a different store in your area because evidently some of them still do it...
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Old 12-02-2008, 07:01 AM   #9
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What other parts should I do while I'm at it and where's a good place to order from??
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Old 12-02-2008, 07:20 AM   #10
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i had that light come on briefly and i noticed i was low on coolant. so i just added the proper amount mixed with distilled water.. i cleared the code with the scanner.. been months (knock on wood) and everything is running great. maybe start there first as i had the same exact symptom.
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Old 12-02-2008, 08:20 AM   #11
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What other parts should I do while I'm at it and where's a good place to order from??
do you mean in regards to this problem or in general? haha, you could change a lot of things!
I usually get my parts from pelicanparts.com
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Old 12-02-2008, 01:24 PM   #12
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I just got my car scan and the code is
P1351 Ignition Coil Control Circuit High Voltage Misfire (it doesnt give me which cylinder)

Anybody knows what that is? The tech guy at the shop was nice enough to scan my car for free and turn off the light. He said it could just be due to cold morning start and the fact that i left my car out for 5days without starting it. He said, it could just be the battery is low on voltage. Hopefully it wont come back on. I will start my engine everyday from now on.
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