Intermittent CEL but car seems to run fine

LowercaseD · 12-05-2023, 08:29 PM

So a couple months ago I got a deal

on a 2010 335d it's a super fun car but has some issues. I have fixed some interior bits and mirrors that we pretty easy. For the most part the only code I had was for the passive Def tank level sensor which I fixed with a 10k resistor. The car did die on me once when the fuel level got below a 1/4 tank and it ran out of fuel. I filled it up and bled the fuel system and it started right up. I finally replaced the fuel filter so hoping that fixes that issue.
A couple times though I have gotten a bunch of codes at start up that seem to not have any effect on the vehicle. CEL comes on as soon as I street it and when I scan the car I get these codes.
DME/DDE [D73N57C0] | 4596: 4596 Operational smoothness regulator, cylinder 3
DME/DDE [D73N57C0] | 4595: 4595 Operational smoothness regulator, cylinder 6
DME/DDE [D73N57C0] | 4592: 4592 Operational smoothness regulator, cylinder 4
DME/DDE [D73N57C0] | 4C89: Coolant temperature, plausibility
DME/DDE [D73N57C0] | 4D16: 4D16 SCR system, efficiency
DME/DDE [D73N57C0] | 459C: 459C Operational smoothness regulator, cylinder 1
DME/DDE [D73N57C0] | 4B16: Zero-quantity adaptation, injector, cylinder 5
DME/DDE [D73N57C0] | 3FF1: Air mass measurement

Car drives fine and when I clear them it stays that way for a while. I'm wondering if the cold is affecting something that wasn't an issue this summer.
Thanks

lnxguy · 12-06-2023, 10:04 AM

Oh boy, you're in for some new injectors in the future. Do yourself a favour get a jug of HotShots diesel extreme and hope those codes go away. Might be able to delay the inevitable.

LowercaseD · 12-06-2023, 12:57 PM

I’m definitely game to give it a shot

. I cleared those codes and they haven’t come back in the past 50 miles. It’s strange that those codes only happen occasionally.

Tomnavigator · 12-08-2023, 12:11 AM

How many miles on the car? Has the car ever been carbon cleaned?

335dlci · 12-08-2023, 11:23 AM

Cbu
If you're socal, hit me up.

LowercaseD · 12-08-2023, 06:58 PM

So the place I bought it from said they looked at the intake and it was clean but we will see how much that was worth. Thanks for the advice everyone. I will put some injector cleaner in for good measure but more importantly I will pull the intake when I get a chance. Can you usually get the manifold off without damaging the gaskets? I can order a set if I’m pretty likely to damage them.

LowercaseD · 12-08-2023, 07:10 PM

I’m in new England so pretty far from socal.

12-05-2023, 08:29 PM	#1
LowercaseD New Member 0 Rep 13 Posts Drives: 2010 335d Join Date: Dec 2023 Location: New England iTrader: (0)	Intermittent CEL but car seems to run fine So a couple months ago I got a deal on a 2010 335d it's a super fun car but has some issues. I have fixed some interior bits and mirrors that we pretty easy. For the most part the only code I had was for the passive Def tank level sensor which I fixed with a 10k resistor. The car did die on me once when the fuel level got below a 1/4 tank and it ran out of fuel. I filled it up and bled the fuel system and it started right up. I finally replaced the fuel filter so hoping that fixes that issue. A couple times though I have gotten a bunch of codes at start up that seem to not have any effect on the vehicle. CEL comes on as soon as I street it and when I scan the car I get these codes. DME/DDE [D73N57C0] \| 4596: 4596 Operational smoothness regulator, cylinder 3 DME/DDE [D73N57C0] \| 4595: 4595 Operational smoothness regulator, cylinder 6 DME/DDE [D73N57C0] \| 4592: 4592 Operational smoothness regulator, cylinder 4 DME/DDE [D73N57C0] \| 4C89: Coolant temperature, plausibility DME/DDE [D73N57C0] \| 4D16: 4D16 SCR system, efficiency DME/DDE [D73N57C0] \| 459C: 459C Operational smoothness regulator, cylinder 1 DME/DDE [D73N57C0] \| 4B16: Zero-quantity adaptation, injector, cylinder 5 DME/DDE [D73N57C0] \| 3FF1: Air mass measurement Car drives fine and when I clear them it stays that way for a while. I'm wondering if the cold is affecting something that wasn't an issue this summer. Thanks
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12-06-2023, 10:04 AM	#2
lnxguy Lieutenant Colonel 357 Rep 1,723 Posts Drives: 2009 335D Join Date: Jun 2016 Location: Barrie iTrader: (1)	Oh boy, you're in for some new injectors in the future. Do yourself a favour get a jug of HotShots diesel extreme and hope those codes go away. Might be able to delay the inevitable. __________________ '09 335D
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12-06-2023, 12:57 PM	#3
LowercaseD New Member 0 Rep 13 Posts Drives: 2010 335d Join Date: Dec 2023 Location: New England iTrader: (0)	I’m definitely game to give it a shot. I cleared those codes and they haven’t come back in the past 50 miles. It’s strange that those codes only happen occasionally.
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12-08-2023, 12:11 AM	#4
Tomnavigator Private First Class 82 Rep 189 Posts Drives: 2010 335D, V-10 Touareg Diesel Join Date: Mar 2015 Location: Southwest Louisiana iTrader: (0)	How many miles on the car? Has the car ever been carbon cleaned?
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12-08-2023, 11:23 AM	#5
335dlci Lieutenant Colonel 277 Rep 1,575 Posts Drives: 335d Join Date: Apr 2014 Location: Socal iTrader: (0)	Cbu If you're socal, hit me up.
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12-08-2023, 06:58 PM	#6
LowercaseD New Member 0 Rep 13 Posts Drives: 2010 335d Join Date: Dec 2023 Location: New England iTrader: (0)	So the place I bought it from said they looked at the intake and it was clean but we will see how much that was worth. Thanks for the advice everyone. I will put some injector cleaner in for good measure but more importantly I will pull the intake when I get a chance. Can you usually get the manifold off without damaging the gaskets? I can order a set if I’m pretty likely to damage them.
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12-08-2023, 07:10 PM	#7
LowercaseD New Member 0 Rep 13 Posts Drives: 2010 335d Join Date: Dec 2023 Location: New England iTrader: (0)	I’m in new England so pretty far from socal.
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