How to diagnose BMW P0171 P0174 lean codes E46 E39 E53
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- čas přidán 8. 08. 2015
- NEW CCV KIT: amzn.to/1U57csp
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How to diagnose the common P0171 and P0174 lean codes on a BMW M54 engine.
Get rid of the codes with a new CCV Kit: amzn.to/1U57csp
M54 suggested maintenance: amzn.to/2gRRyEw
Symptoms will include rough idle, poor fuel economy. This particular car was repaired with just a new CCV crank case ventilation valve kit, and by thoroughly cleaning the dipstick guide tube. The valve cover also cracked from the excessive pressure due to to failed CCV valve, so it was replaced with a new one available here: new CCV Kit: amzn.to/1U57csp
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Bimmer zelt I had these 2 codes could they be a bad fuel pump or fuel filter my car runs fine it's not hard to start or anything
Nice, had those isues when I bought my 325i facelift (E46) three years with 94k miles. Very common with the M54 engine. Me and my dads friend who works on bmw and drives a E46 replaced it all along with the CCV pipe. Runs so much smoother
I had these codes recently and it turned out to be a tear in the lower intake boot - very common point of failure (and so is the upper boot, come to think of it...).
The old owner of my 525I said he repaired/replaced the ccv, so i ruled it out for my vacuum leaks, but seeing this i have the same oil leak, and this is my second valve cover gasket. Thanks so much !
Zach V it’s common for these cars to go through several gaskets and ccv’s even low mileage ones can fail. Best way to diagnose is to pay local shop an hour or two to diagnose leak source with smoke machine
can't believe it's so hard to find a good video on this! thanks a lot👍
Thanks Adryan!
Anybody knows what was the problem ? I have the same problem 🥺😡😡
Woooooooooww! I was literally just out to me and 18-yr old son's project car, a 323 Coupe from -01, which is running like crap. We have done so much troubleshooting and so much repairs to it, but still had done nothing the CCV. I got the exact same symptom you did, lid was sucked stuck and when I removed it the enginge stalled and rushed and stalled. Will try to find a CCV now...
It is also good to check fuel pump when the m54 is running lean
Cool video thanks I keep getting p302 code but I think I put a new battery in and didn't code it to the specs yet or I think it's what you said a vacuum leak gotta try your methods
i have a 99 528i, I have the same engine, my code reader gave me THROTTLE POSITION SENSOR and another reader PEDAL POSITION SENSOR, my car idle is rough. Would you PLEASE, make a video on WHERE EXACTLY ARE THE TPS SENSORS AND HOW TO REPLACE THEM?
I have a p1500 code cleaned the icv valve and replaced maf sensor. What else should I look for?
i just bought one and changed the valve cover gasket becouse was leaking in the same area and have the same code and i notice that the area of the pcv was very dirty i was thinking in changing the pcv becouse it has to be dirty too but i confim with youre video thanx
Very useful information, liked & subbed
Good day tell me the error code P1519 in BMW E39 m52tu where to look for a fault. Thanks for the early update.
Thank you so much. Excellent. !!
great information
Nice and ckear!!I love your video
Ima getting a po171 po174 I tried the oil cap trick an it's a faint suction any other ideas ?
No vacuum leaks it's the fuel pump
So what's your fix? No mention of disa valve?
What was the issue? Thx for sharing!
Wow you are truly great at explaining things 🙏🏼
Thank You !!! 👍👍
I had these codes pop up on my 05 325i and I checked the DISA valve and when I pulled it out, the o-ring was gone and the rubber on the valve was worn down pretty good...So after ordering one off Amazon for $94, I installed it and haven't had an issue since and engine light hasn't come back on.
Dealership and auto parts store wanted $400-$600 for the DISA Valve!!! Saved a ton of money on repairs 😎👌
I have a 2002 x5 3.0. ... my Ses light comes on and stays on ... but for some reason when 3/4 tank full of gas light goes off ... then will come back on ... could this be the fuel cap ? I also took it to orileys and a code didn’t come up for a min but then a code p1092 came up .... any suggestions ?
A p it could have been your fuel sender unit
So what was wrong with the car. I did the cap test, I had very light suction.
So, what did you do?
I just has my ccv system replaced on my 2006 BMW x3. now 2 engine light codes are on after I picked it up from shop. could it be too much oil in cats or in oxygen sensors?
Did you ever find out?
Question: Which ect sensor operates the water temp gauge? Mine goes straight to red and stays there when I turn the ignition on. I have both codes in this video on my 2001 BMW 325I and I'm tackling them tomorrow. Thanks for the info.
I have these codes on my 04 330i that would not clear after I reset the cel..i could not figure out why..i took off my maf and cleaned it and put it back on and the codes cleared..few days later they came back so I did the same thing and now they are back again...u think i should probably replace the maf?
you should get a local mechanic to smoke test the system to look for leaks in the intake system. This is the most common reason for lean codes. Spend your money on that diagnosis first. It should be 1 to 2 hours labor charge
I literally get p2098 and I changed all sensors now I don’t even know what it could be 😫
Hey all, I have an issue with a bmw z3 M54 2.2i. It keeps coming up with bank lean codes and misfires. Both banks and single banks, random misfires, but diagnostic says cylinder 5 is troublesome. No obvious vac leaks anywhere... fault has been getting more frequent, although the car hasn’t run much in the last six months... any thoughts??? Thanks.
Have same problem with same engine xD
When you take the oil cap off your car when it’s running do you ever have smoke coming out? Is that fairly normal? I always have some smoke coming out of my cap.
Nod Melon run a heavier oil and see if you have the same issue.
It will always the engines gets real hot that's normal
I have this issue on my 06 range rover HSE 4.4 jag motor. The oil cap is hard to pull of so I replaced my PCV Valve and it still does the same thing?
Anyone know how to fix a 1188 of 1189 code...... I been fighting with this code for almost 6 weeks
I don't even want to go into the issues I'm having with the 2003 530i I'm dealing with but here goes. The car sat unused for approximately five years, it was owned by my customers aunt who then purchased it for the paltry sum of $400.00 which on the surface sounds like a good deal but remember we're dealing with a Nazi mobile thst sat for five years outside in the northeast specifically NJ central Jersey to be exact, I advised him not to buy it and was met with the usual all that's wrong with it is, an oil leak, when speaking about a BMW leaking oil you use the plural, leaks because there's more than one place it's coming from, he also has very little money so he pays me when he can, this thing was leaking every kind of fluid except for trans fluid but remember it hasn't been driven I suspect that will be next. So far I've done the oil pan gasket the oil filter housing gasket and vanos hose which was pouring out of it, all the radiator and heater hoses, a new coolant tank new brakes all around and the valve cover gasket and that's when the problem started. I also changed the purge valve due to the p0444 code which was the only one that there was prior to doing the valve cover gasket, when I was finished and started the engine I got p01085 p01083 p0 1171 p01174, what the heck did I do wrong? There was a small I assume vacuum hose in the back of the engine that basically disintegrated so I fixed that there was another very brittle hose that was kind of collapsed but I left it alone, could that possibly be the source of a leak big enough to cause a leak condition? The engine runs smooth except on start up but it quickly smoothes out, I did replace the curved bellows hose on the air intake because it was cracked so that's not it, and the best part is that there's still an oil leak but I can't figure out where it's coming from, it's on the drivers side coming from the top, it's not the oil pan gasket that I know for sure, it's nothing like the way it was leaking before because it would leave a puddle everywhere you parked, I wondered why there were three empty bottles of oil in the trunk. Inspite of everything the car does run and drive very well, he did have to get new tires, two of them were original made in 2002 believe it or not and the other two from 2009, the car has 92,000 on it, oh I also put new lenses on the headlights which are of the xenon variety also new adjusters which of course were all broken, the auto adjusting headlights do work which was surprising, I forgot a new water pump and new belts.
Nothing more expensive than a cheap BMW! Sorry to hear. You’ve done a lot so far, nice work. You may want to smoke test it with an inexpensive smoke tester like I used here: czcams.com/video/QIGQGai5ngs/video.html
Valve cover gasket probably leaks too. The plastic covers can also leak both oil and vacuum when cracked or warped. Also the ccv hoses. You can add UV dye to oil and inspect leaks with a UV flashlight to find the leak source.
You could also smoke test the whole intake, even from exhaust pipes.
Bring My Wallet smoke test is the best and most accurate way for sure! Shops around here charge 2-300 for that diagnosis though.
BIMMER ZEIT You could buy your own smoke machine:p be aware, heard that the smoke can trick the sensors.
I am getting the p0171 and p0174 error with a P2237 pending! I tried the oil cap removing it and i get a very faint suction. Does that matter?
Shawn, a faint suction is normal. Check out this video I made on a failing CCV: czcams.com/video/vODpt5b2DsM/video.html
Love this informative video
You show the valve cover cap being hard to remove, suggesting a vacuum in the crankcase. But then you conclude that the CCV valve is broken, and the crankcase is under too much pressure, the opposite of too much vacuum. Which is it?
Vacuum = negative pressure. A CCV valve can be stuck open or stuck closed, they fail both ways.
Very few technical people say too much pressure when they mean too much vacuum. So in this case, was the CCV stuck open or closed?
Hey Don, sorry for the confusion. In this case I meant vacuum or negative pressure; this CCV was likely stuck open due to a failed diaphragm inside the CCV itself. However, they can fail in the opposite way where the valve is stuck closed and creates too much positive pressure.
Do you mean PCV Valve?
No bmw are ccv not pcv
I have the p0174 ccv changed pcv changed code still pops up on me left and right
can be many things on these cars: hairline crack in plastic valve cover, valve cover gasket leak, crack in ccv system, clogged dipstick tube drain, cracks in rubber intake boots (upper and/or lower), etc etc. smoke test is best way to start.
I have the same peoblem with my 97 520i with one vanos, the technicker that looked at it says the worst thing ks that the valve cover gasket gets blown and you get a whole in it where the oil will leake out cause of the ccv valve and it can get so tight in the ccv valve that the engine will accually fail to give the gas pressure you give it eith the throttle and then makes it unable to drive cause the ventilation that needa to operate corectly is not functning. Symptoms that i also got and understood the valve is broken is that the car can suddenly from time to time all randomly, caugh og jump like if you clutch down very fast, also i got once, a oil presseru lamp in red, but despite that, the only worst thing that he said can happen is the gasket get defect and the valve lines get so tight, the engine cant work until its replaced and cleaned nice again.
He checked this on my 520i, maybe 4-5 weeks ago and i only have had 2-3 long drives since then and now it is struggling to get gas power to move forwards. So i suggest to all of you guys with this problem ASAP!
thomas backer hi there,
- i'm in a very bad situation here with my lovely e39 9/2000 2.0litre dual vanos
In 4 days i am about to travel 1400km but car broke 3days ago
-I suddently had yellow engine light on paired with EML and Asc tringle lights on . Car acted like bump on rocky road or as you say more correctly as if you hard-press clutch fastly and badly.
I just couldnt do even 10mph. Engine wasnt working right. Like air and/or gas was missing or a sensor(cam/crankshaft) sent wrong data to ECU. idle only wasgood. When you press acceleration pedal is when the problem occures.
After 8 hours i started engine again. EML light was off(only yellow engine light was one) and the car was working perfectly.
Since then they've come randomly both: EML light and engine problem.
But today i had it all day on. I think it is not going to light off any more
:(
Do you think CCV (CPV) is able to cause this problem?
*I don't have electric gas pedal or electric throttle valve.
Tommorow i ll go to read codes...asap
->very nice video of yours!!
@@sakissyard what code did you find?
@@ovidiurisco1251 honeatly i dont remember. But i put a new OCV aka CVVand everything is right ok
@@sakissyard my e39 520i runs great but i have the check engine on and the scan tool indicate:fuel trim bank 1 and 2 permisibile range excedeed,
A bad fuel pump set these codes off for me. I changed fuel pump and the codes were gone. I spent hours looking for a vacuum leak.
Interesting, thanks for sharing your experience with it. What model car was that on?
2004 330xi
Hmm... seems strange because i got those codes when the fuel went under half tank.. i had a tear on the upper intake boot(just right after the MaF sensor) replaced it and reset the ses light.. light was gone for 3 days and earlier i warmed up the car and the light went back on..
Sounds like a bad sending unit or pump.
What made you change the fuel pump?
I used to own this car but this car is nothing but a great example of what happens to these cars made of plastic. I spent thousands on components of this car that used to be made of metal back then that failed due to wear to the plastic. Such a beautiful car wasted on garbage engineering. Why spent millions of dollars in great German engineering to waste it on PLASTIC!.
It is a shame, but overall they're lighter and cheaper to produce. Cars today are designed to be disposable after XX amount of miles, that goes for BMW and all German brands.
mines leaking in the back right now after replacing valve cover gasket and its pissing me off, also got those codes
Michael Swetell mike you may have a warped valve cover or a very small hairline crack. Very very common on this engine. I've replaced 3 m54 covers that had hairline cracks of around 3/4" that cause vacuum leak and codes. It's not cheap- around $400 list or $300 wholesale. Try torquing it down again maybe a nut or two is loose... let's hope that's all it is!
yeah i got an estimate from a really reputable german car repair shop for around 600, that includes valve cover replacement and new valve covers. my car has 152k and im sure the covers are warped. Im getting my flex disc done over there in a couple of days for 395
Michael Swetell if you get a cover for $300ish and DIY you can save $300 in labor. Maybe replace the spark plugs while you're in there (I have a DIY video for this too). The flex disc is not fun, even I would pay to avoid doing that one!
haha yeah i replaced my spark plugs with premium NGK's when i did the valve cover gasket. I rather just pay the extra little bit for the assurance that it will be done correctly and by bmw certified technicians. I do do a good bit to my car myself, i just relaced upper and lower radiator hose with mishimotto high heat resistant hoses off eeuroparts, flushed all the coolant out, because the person i bought my car from wasnt using bmw coolant and filled and bleed properly with 50 blend of coolant and distilled water, i did an oil change a while ago with castrol edge 0w40 european formula with oil filter chage, i also did a fuel filter change, cotrol arm replacement and some other stuff. My rides an 04 330ci coupe metalic gray!!
2001 325i: Changed valve cover gasket twice before I found a hairline leak in the cover. Changed the cover with the bolts and grommets and fixed my problem. Got a complete set just under $100 on Amazon.
mine was clogged fuel filter + dead fuel pump
If valve cover gasket was bad you wouldn't have all of that vacuum
If engine is hot be careful this stuff is highly flammable.
I have a e39. The P in the P01-99 stands for PCV joint leak 1,2,3,4-100 etc. In some countries it stands for Plastic pipe brittle replace someday. Best is to delete the crank case and the engine.
What if there is no crank case pressure when you loosen the oil fill cap? Just a little when taking the cap off. Not like this video.
Alan, it sounds like your car is just fine! That's how it should be.
Man looks like ccv for me
whoa
this is a dead ccv lol
the suction noise
guess mine is good then
So you show us a car that has a lean code and don't show us the root cause. You didn't even consider a sas issue, low fuel pressure at the rail.. or an IAC issue,,, how about injectors not operating ..bad o2 sensors. no numbers, no diag, no fix.. ummm I'm confused.. I guess thanks for showing us a car that has an issue????
Hey +Ben Dover, the most common cause of these lean codes are vacuum and air intake leaks. This is the first thing I check and also the easiest. Both the root cause and solution are described in the description above. This car had a failed CCV valve with excess pressure at the oil cap. The dipstick tube clogged, which caused the valve to fail, which then cracked the valve cover. We installed a new CCV valve kit with all of the new lines and this resolved the lean condition. We also later installed a new valve cover on the car.
+BIMMER ZEIT good video, thanks
M