S55 AMG, S65 AMG , S63 AMG (W220, W221) 2001 - 2013 (Two Generations)

And so it begins! V12 Coil pack issue

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Old Mar 7, 2017 | 06:15 PM
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jlg32281's Avatar
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From: Vidor, Texas
06 S65
And so it begins! V12 Coil pack issue

I bought this car a while back and it's been great so far. Today, the CEL came on. I didn't notice any difference in the way it ran or performed. When I got home, I hooked up the OBDII reader that I have and pulled the codes. I'm suspecting one of the coil packs is on it's way out. One side has already been replaced and I'm guessing the other side is now tapping out. Any other ideas on what it could be before I buy a new coil pack?

2006 S65 w/ 85K miles

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Old Mar 7, 2017 | 09:05 PM
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ItalianJoe1's Avatar
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2003 CL 600
That's both sides, so not likely it's just one coil.
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Old Mar 8, 2017 | 09:03 AM
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2006 W220 S65 AMG
If it's both sides, then it could be the voltage transformer. You can rent one from Clark over at v12icpack.com to see if that's your issue. If it is, you can buy the transformer right away and leave it on. If not, you can return it.
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Old Mar 8, 2017 | 11:41 AM
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From: Vidor, Texas
06 S65
Originally Posted by amstel78
If it's both sides, then it could be the voltage transformer. You can rent one from Clark over at v12icpack.com to see if that's your issue. If it is, you can buy the transformer right away and leave it on. If not, you can return it.

I've already emailed with Clark. He's such a great resource and whatever parts I need will come from him as long as it's something he sells. Clark says that a vacuum leak or bad O2 sensor can also cause similar codes.

I ended up clearing the codes and I'm waiting to see if they come back on. It was a bit odd to me that the car has had zero issue for the last 10k miles and then, all of a sudden I got all of those codes at once. There was no noticeable performance drop. I'll add one layer of detail to this situation, yesterday I had a tire go bad on the front and took it to Discount Tire and when I dropped it off at Discount Tire, the CEL was off. When I picked it up, it was on. They said all they did was put the spare tire on but I can't help but think that just maybe they were looking around and bumped something (battery) that gave it a temporary glitch.

I also pulled my maintenance log and at least one side coil pack was replaced at 45K miles in 2010.

For now, I'm in a holding pattern waiting to see if it comes back on again. I drove it 15 miles to my office this morning and put it under load, as my commute includes a stretch of interstate where I cruise around 100mph for about 5 miles. (I don't need any lectures on my irresponsibility)
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Old Mar 8, 2017 | 11:43 AM
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jlg32281's Avatar
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From: Vidor, Texas
06 S65
Originally Posted by amstel78
If it's both sides, then it could be the voltage transformer. You can rent one from Clark over at v12icpack.com to see if that's your issue. If it is, you can buy the transformer right away and leave it on. If not, you can return it.

I also thought of that it could be the voltage transformer but I'll just have to wait and see if/when it comes back on if it throws the exact same codes. I would think that a bad voltage regulator would produce random misfires and not ones linked to exact cylinders. We shall see.
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Old Mar 8, 2017 | 12:29 PM
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2006 S65
Originally Posted by jlg32281
I've already emailed with Clark. He's such a great resource and whatever parts I need will come from him as long as it's something he sells. Clark says that a vacuum leak or bad O2 sensor can also cause similar codes.

I ended up clearing the codes and I'm waiting to see if they come back on. It was a bit odd to me that the car has had zero issue for the last 10k miles and then, all of a sudden I got all of those codes at once. There was no noticeable performance drop. I'll add one layer of detail to this situation, yesterday I had a tire go bad on the front and took it to Discount Tire and when I dropped it off at Discount Tire, the CEL was off. When I picked it up, it was on. They said all they did was put the spare tire on but I can't help but think that just maybe they were looking around and bumped something (battery) that gave it a temporary glitch.

I also pulled my maintenance log and at least one side coil pack was replaced at 45K miles in 2010.

For now, I'm in a holding pattern waiting to see if it comes back on again. I drove it 15 miles to my office this morning and put it under load, as my commute includes a stretch of interstate where I cruise around 100mph for about 5 miles. (I don't need any lectures on my irresponsibility)
Hopefully they just bumped something or someone decided to take it for a ride...
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Old Mar 8, 2017 | 12:33 PM
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06 S65
Originally Posted by VinnyT
Hopefully they just bumped something or someone decided to take it for a ride...
I considered this too but I'm always scared of this and I always write down what the mileage is when I drop it somewhere. If they took it for a ride, it was less than 1/10th of a mile long. lol
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