S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

P0312

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Old 08-21-2021, 01:18 PM
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2007 S600, 2007 Chrysler 300 SRT8, 2000 C5 Corvette, and 2017 Mustang GT, and just got a 2023 300C
P0312

Hi All,

Took out my S600 for a romp today after filling it up and dropping in a can of Techron and 4 ounces of OctaneBoost in my tank. Car ran really well for a nice ride at a steady 70. No misses, no bumps, no nothing. Just smooth as silk.

So of course I decided to step on it hard. I ran it up from about 45 to 105 mph mostly second and third gear. Right at 105, she threw a miss and a CEL. When I got home, I checked codes and had a P1170, P0300, and P0312. Cleared the codes and restarted and so far no problem. I will report back in a few days if the CEL returns.

New coil pack from Clark on that side and a new VT on top also from Clark.
Old 08-21-2021, 02:26 PM
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S500
P1170 Short term fuel trim (FT) - malfunction CAUSES: Intake/exhaust leak, injector(s), fuel pressure, MAF sensor
P0300 Random/Multiple Cylinder Misfire Detected
P0312 Cylinder 12 Misfire Detected
Old 08-30-2021, 08:05 PM
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Depends on the weather
All is well with no return codes?
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Old 08-31-2021, 12:27 PM
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2007 S600, 2007 Chrysler 300 SRT8, 2000 C5 Corvette, and 2017 Mustang GT, and just got a 2023 300C
All remains well. No CEL. No codes yet. But thanks for checking.
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