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#1
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P0172/P0175 - cold weather
P0172/P0175 It was a 10 mile drive in cold temps, 30F. It was colder this morning, 25F. The last time these codes popped up, it was a year ago in cold weather too. I reset them last time, they didn't come back until today. It took almost all 10 miles to get to the temp middle point. No traffic due to weather, so highway speed and 40+ MPH on side roads. The drive this morning was slow due to snow and ice patches. Are these codes common in cold weather? The intake filter is about a year old. Time for a new one. Mahle filters are used for intake and cabin. ![]() Codes are reset so I'll see if the SES light comes on again. It passed emission testing last month, so registration is no problem this month.
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'06 X5 3.0i - bought @143,123 miles (12/26/20) |
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#2
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Drove to the airport yesterday, it was 5F/–15C. No problem other than a weird screech from the starter. Heat came on quickly. No stumbles, smoke, etc.
I'd be screeching too if I was the starter... Anyway I was getting those codes too, only it was last summer, so I don't think it's temperature-related. I disconnected the battery for an hour to reset "adaptations" I think it's called, and that fixed the problem if one indeed existed... no more codes. OK no more of THOSE codes.
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2001 E53 M54 5MT Oxford green over crusty black leather
2014 F30 N55 6MT mineral gray over red leather |
#3
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Thanks for the feedback. I did check O2 readings. Front sensors were oscillating. Rear O2 sensors were steady. Closed fuel loop. It was @147F. It had cooled off a bit before I scanned it. Fuel trims were probably right under 0 once short term and long term are subtracted from each other. No light came on after driving to work this morning. I'll check fuel trims since everything was cleared out.
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'06 X5 3.0i - bought @143,123 miles (12/26/20) |
#4
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P0172 /P0175 - Those are codes for Rich fuel trims, right ? I might suggest you get a BMW-specific code reader...the P codes are too generic..
These cars have no consistent problem in cold weather - other than frozen door latches that won't latch. I started mine and drove it to the airport at -1 degree F...and that's not even that cold... If it continues, you should measure actual long term fuel trims with INPA or OBDFusion or other app/scanner. You might also measure your fuel pressure at rail. We've seen bad MAF's, faulty fuel regulator in new fuel filter (Hecht) leaking injectors and other things cause a rich condition.
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'03 530i - manual swapped - 425k miles '06 325Cic auto 115k '05 X5 3.0 auto 158k '99 E39 528i 5-speed 130k |
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Quote:
Getting a BMW specific scanner is a must! Sent from Embassy network using Tapatalk
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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course |
#6
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I have a Foxwell Pro 520. It was easier to grab an Actron scanner for codes. If they come back, I'll use the Foxwell. Since I've saw them over a year ago, the Actron was a quick choice. Air filter restriction can cause rich codes. I'll check the filter once it warms up this week.
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'06 X5 3.0i - bought @143,123 miles (12/26/20) |
#7
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Found two codes: E3/E4
AI search: The E3 and E4 Codes are adaptation codes. Any thing that that affects fuel/air mixture can set this code. The most likely source though is increased air not being measured by the maf. Before scanning and search for codes, I look it over. I removed the air intake assembly for valve cover work. The air tube connection right after the MAF was not on good. The clamp was really loose. I fixed the connection and tighten the clamp. The BMW codes seem to line up with an air intake hose issue. I cleared the codes. I’ll post back after a few hundred miles of driving.
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'06 X5 3.0i - bought @143,123 miles (12/26/20) Last edited by X5chemist; 01-25-2025 at 10:19 AM. |
#8
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Thanks to Effduration for putting you on the right track
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#9
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Forgot to mention a clip was loose too. After resetting the codes, they have not come back. All emission tests have passed.
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'06 X5 3.0i - bought @143,123 miles (12/26/20) Last edited by X5chemist; 01-31-2025 at 08:54 AM. |
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which MAF sensor are you currently using?
X5chemist- are you still using the cheap $20 MAF that you recommended to me over 2 years ago, and said that you had been using yours for a year at that time?
As you might remember, my problem was the opposite of yours, as I was getting lean codes P0171 & P0174 (I'm still getting comparatively high fuel trims) versus the rich codes you were recently getting. I'm not getting codes at this time, though it's probably because I routinely reset everything frequently, and often check for loose fittings, good O2 readings, and have smoke-tested maybe a dozen times. The cause of the high fuel trims remains elusive, after 3.5 years of searching for it. Congrats on solving your rich condition problem. I'm about to give up using my $20 MAF (I have two of them), and try a mid-range cost, German-built MAF (Hella or Bremi), to try to get better fuel trim readings. The original? Siemens-VDO MAF I had was proven to be getting worse every time I cleaned and re-installed it, so though everyone seems to say that it is the only brand to use, I can't see my way to spend more $$ to get another one, only to see similar bad readings (mine got so bad, I took it apart to check for internal faults, but found none).
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01 BMW X5 E53,3.0i-5L40E, 7/13/01 topas-blau,Leder-grau,"resto-project car" Here: 14 Lexus ES350,3.5L-U660E 09 HHR Panel,2.2L-4T45E 04 Chevy 2500HD,6.0L-4L80E 98 GMC Sierra 1500,5.7L-4L60E Gone: 66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake 08 Cobalt Coupe,2.2L-4T45E 69 & 75 C10s,350c.i.-TH350 86 S10,2.8L-700R4 73 Volvo 142,2.0L-MT4 72 & 73 VW SuperBeetles,1.6l-MT4 64 VW,1.2l-MT4 67 Dodge Monaco 500 2dr ht.,383c.i.-A727 56 Chevy 210 4dr,265c.i.-PGlide Last edited by workingonit; 01-31-2025 at 05:45 PM. |
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