2007 E320 Repeated gold coil warning with CEL after glow plugs replaced
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Junior Member
Joined: May 2007
Posts: 16
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From: Vancouver, WA
2007 E320 bluetec, 2009 ML320 Bluetec
2007 E320 Repeated gold coil warning with CEL after glow plugs replaced
MY 2007 E320 Bluetec, 69000 miles. Original owner. The gold coil warning sign came on intermittently and eventually the check engine light came on constantly 1 month ago. I found that the glow plug #2 was bad from reading the OBDII scanner.
I ordered all new 6 OEM glow plugs from MB and replaced them myself. Planning to keep the car for another 6 years. Kept the older 5 plugs for later use if needed.
Check engine light still stays onafter 3 weeks of driving. The gold coil lights up on start up for 20 seconds in the morning and leaving work. I try to clear the CEL with the OBD scanner but it comes on the next day. The scanner reads glow plug #2 can't communicate.
The car drives fine. No hesitation, no smoke from tailpipe, mileage seems the same on 1 full tank as before.
What could I have missed?? Is there something else I need to replace?? Should I disconnect the battery to reset the CEL?? Researching the internet, is there carbon build-up in the original failed glow plugs chamber that I need to clean with a brush?? Do I need a SDS reset instead??
Thanks in advance
Pat
I ordered all new 6 OEM glow plugs from MB and replaced them myself. Planning to keep the car for another 6 years. Kept the older 5 plugs for later use if needed.
Check engine light still stays onafter 3 weeks of driving. The gold coil lights up on start up for 20 seconds in the morning and leaving work. I try to clear the CEL with the OBD scanner but it comes on the next day. The scanner reads glow plug #2 can't communicate.
The car drives fine. No hesitation, no smoke from tailpipe, mileage seems the same on 1 full tank as before.
What could I have missed?? Is there something else I need to replace?? Should I disconnect the battery to reset the CEL?? Researching the internet, is there carbon build-up in the original failed glow plugs chamber that I need to clean with a brush?? Do I need a SDS reset instead??
Thanks in advance
Pat
Senior Member
Joined: May 2004
Posts: 416
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From: Lone Star State.
W211 2005 CDI, X166 2013 350 BT, 997.1 2008 C4S
Bump. Ditto with me too. W211 2005 CDI. Anyone with ideas? Changed all glow plugs, after 7 years, both batteries replaced as well. Advice would be appreciated.
Super Member
Joined: Dec 2009
Posts: 541
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From: USA
10 speed bicycle
If you had a DTC for cylinder #2, and you replaced it and still have the same fault, I would want to verify the wiring is ok. You can either check the wiring resistance, or you can use an inductive amp clamp and some jumper leads. The amp clamp is the preferred method as that is more of a dynamic test.
