N55 codes

Null0Naru · 08-02-2020, 03:08 PM

Hi guys, need a little help chasing down a gremlin on a 2011 N55 335i.

I'm getting the below codes:

Active Codes:
29D0 - Intake Air Temperature Sensor. Short circuit to B+

Shadow Codes:
290A - Intake air temperature sensor: Multiple Fault

I'm not getting any CEL. Symptoms seem to be a somewhat laggy feeling at low load and occasional dips in RPM when coasting to a stop in neutral.

I've had charge pressure sensor codes in the past, which I've since resolved by replacing the MAP sensor in the charge pipe (think this may have gone when my stock charge pipe blew), so I know it shouldn't be that sensor.

Do you know if these codes are for the MAF sensor prior to the turbo? I'm less willing to just replace it due to the sensor running £300 from the dealer or £200 or so from the likes of VDO. The only other option would be the MAP sensor in the manifold, but would expect that to present with charge pressure codes.

If I reset the Intake Mass Flow adaptation, the car feels much better, requiring less pedal to get up to speed and overall much more torquey feeling under lower loads. This will stay like this for a bit, then the symptoms will come back after a while. If I clear the codes, the timing of the symptom re-appearing and the code re-appearing seem to match.

PS. These codes seem to often turn up results for misfires on cyl 4, but I know it's not this. Spark plugs and coils have been replaced recently.

Relevant modifications:
BMS Intake (I've tried with the stock intake, same symptoms)
VRSF 7.5" Stepped Intercooler
Wagner high-flow catted downpipe
Masata Aluminium Charge Pipe

Tunafish · 08-08-2020, 07:08 PM

29d0 is the wire/sensor between the air filter and turbo.. First sensor past air filter.. Check that.

335nista · 08-20-2021, 04:37 PM

Quote:

Originally Posted by Tunafish

29d0 is the wire/sensor between the air filter and turbo.. First sensor past air filter.. Check that.

Quote:

Originally Posted by Tunafish

29d0 is the wire/sensor between the air filter and turbo.. First sensor past air filter.. Check that.

So the maf sensor?

MayanRosales · 12-30-2023, 08:51 PM

Hey I’m having very similar problems with my 2011 n55 335i. Same codes are shown along side code 2774 - Air Volume, plausibility: Air volume too high. Ik this is a dead thread but I can’t find any more info on these codes and was wondering if you were able to figure out what the cause of your issue was. I have same symptoms aswell.

08-02-2020, 03:08 PM	#1
Null0Naru New Member 8 Rep 25 Posts Drives: BMW E92 335i Join Date: Feb 2020 Location: United Kingdom iTrader: (0)	N55 codes - 29D0 + 290A Hi guys, need a little help chasing down a gremlin on a 2011 N55 335i. I'm getting the below codes: Active Codes: 29D0 - Intake Air Temperature Sensor. Short circuit to B+ Shadow Codes: 290A - Intake air temperature sensor: Multiple Fault I'm not getting any CEL. Symptoms seem to be a somewhat laggy feeling at low load and occasional dips in RPM when coasting to a stop in neutral. I've had charge pressure sensor codes in the past, which I've since resolved by replacing the MAP sensor in the charge pipe (think this may have gone when my stock charge pipe blew), so I know it shouldn't be that sensor. Do you know if these codes are for the MAF sensor prior to the turbo? I'm less willing to just replace it due to the sensor running £300 from the dealer or £200 or so from the likes of VDO. The only other option would be the MAP sensor in the manifold, but would expect that to present with charge pressure codes. If I reset the Intake Mass Flow adaptation, the car feels much better, requiring less pedal to get up to speed and overall much more torquey feeling under lower loads. This will stay like this for a bit, then the symptoms will come back after a while. If I clear the codes, the timing of the symptom re-appearing and the code re-appearing seem to match. PS. These codes seem to often turn up results for misfires on cyl 4, but I know it's not this. Spark plugs and coils have been replaced recently. Relevant modifications: BMS Intake (I've tried with the stock intake, same symptoms) VRSF 7.5" Stepped Intercooler Wagner high-flow catted downpipe Masata Aluminium Charge Pipe __________________ E92 335i N55 - Wagner HF DP, Magnaflow Catback, VRSF 7.5" Competition HD FMIC, Masata CP, BMS Intake, M3 Strut Brace, MHD STG2+ 98 RON.
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08-08-2020, 07:08 PM	#2
Tunafish Banned 262 Rep 818 Posts Drives: BMW 335i N55 Join Date: Dec 2019 Location: Home iTrader: (0)	29d0 is the wire/sensor between the air filter and turbo.. First sensor past air filter.. Check that.
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12-30-2023, 08:51 PM	#4
MayanRosales New Member 2 Rep 24 Posts Drives: BMW 2011 e92 335I Join Date: Jan 2022 Location: Louisiana iTrader: (0) Garage List 2011 BMW 335i [0.00] 2011 bmw 335i [0.00]	Hey I’m having very similar problems with my 2011 n55 335i. Same codes are shown along side code 2774 - Air Volume, plausibility: Air volume too high. Ik this is a dead thread but I can’t find any more info on these codes and was wondering if you were able to figure out what the cause of your issue was. I have same symptoms aswell.
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