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Glow plug CEL P0672

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Old 03-25-2012, 06:01 PM
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2008 ml320 CDi
Glow plug CEL P0672

Hi,
I have 2008 320 cdi, the glow plug lamp on occasion takes 30 - 40 seconds to go off. Not regular. The CEL came on, i tested this at Autozone and it gave a code P0672....indicates the number 2 cylinder glow plug may be faulty. By the time i received a new one ordered from the dealer, the CEL went off and the GP light turned of as usual..1-2 secs. I went ahead and installed the number 2 cylinder GP. Everything was fine for two weeks. A few days ago, the GP light took 30-40 secs to go off...very sporadic. Yesterday the CEL came on and same code P0672. I have a new GP, could the module be going out? Now GP light goes out as normal but CEL is on.

Any clues?
Thanks
MB
Old 03-25-2012, 09:07 PM
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GSD
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2007 ML320CDI 2004 Jetta TDI
spray deoxit in the harness and try that first.
Old 03-25-2012, 11:53 PM
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GSD, thanks for the reply. Can you please be more specific, where exactly should i spray, in the connector that plugs over the glow plug? Where do i get deoxit from, any brand name? I am assuming this is a deoxidizer?

Thanks for the help.
MBP
Old 03-26-2012, 08:15 AM
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Glow plug relay ?
Old 03-26-2012, 07:01 PM
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2007 ML320CDI 2004 Jetta TDI
Originally Posted by mbhouston
GSD, thanks for the reply. Can you please be more specific, where exactly should i spray, in the connector that plugs over the glow plug? Where do i get deoxit from, any brand name? I am assuming this is a deoxidizer?

Thanks for the help.
MBP
Spray the deoxit in the harness where it connects to the Glow Plug.

Deoxit is normally available at TV, Hifi repair shops and removes oxidization. You can also check the resistance of the glow plugs with a ammeter/volt meter too.

Take a look at this thread on a TDI
Old 05-12-2012, 02:58 PM
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2008 ml320 CDi
Hi,
CEL reset it self. It was fine for a while. Glow plug light was taking 40 secs on occasion to go off for a few days. CEL came on again. I checked the code, it is the same code P0672. Odd thing, when I turn the key on, glow plug light goes of as usual, once the car starts, it comes on for 40 sec plus, and goes off.
I used deoxit on all the connectors.

Could the timer be going out? Thanks
MBP
Old 05-12-2012, 10:27 PM
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Glow plug relay ?
Old 05-13-2012, 09:03 AM
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Is the relay a common problem?

Thanks
Old 05-13-2012, 03:47 PM
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GSD
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Did you measure the resistance on each plug?
Old 05-14-2012, 10:18 PM
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what should the resistance be? can I measure while the plug is still in?
Thanks
Old 05-28-2012, 06:31 PM
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Originally Posted by mbhouston
Is the relay a common problem?

Thanks
Don't know if it's "common" ....it cost me $600.00 to have it fixed
Old 05-28-2012, 07:47 PM
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Thanks for the reply. I can buy from the dealership for $130...will take 20 minutes to install. Just want to have a little insight on similar experiences and the outcome. I will buy from this dealership..online.
http://www.genuinemercedesparts.com/...&siteid=215306

Regards

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