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Thread: 2001 525i throwing bunch of codes

  1. #1
    Join Date
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    2001 bmw 525i

    2001 525i throwing bunch of codes

    I started having some issues with taking off the car sometimes hesitates. And currently makes a backfiring sound a little bit. Once moving the car seems to run mostly normal. Replaced all the spark plugs with recommended bosch ones from parts store and ordered all new coils online and replaced those as well. I'm currently receiving 7 codes which are:

    171 - system too lean (bank 1)
    172 - system too rich (bank 1)
    174 - system too lean (bank 2)
    175 - system too rich (bank 2)
    313 misfire detected low fuel level (pending)
    456 - evap emission control system leak very small
    1351 - cylinder 5 misfire

    Any suggestions or help on what's going on would greatly be appreciated.

  2. #2
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    2001 525it
    Smoke check the intake manifold system sounds like vacuum leaks

  3. #3
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    E39M5, E500 4WD
    Welcome to the forum.

    +1 to the smoke test. This is done with a professional smoke machine. A good BMW/Euro specialist shop should have this device. They should follow up with a fuel pressure test, because you also have "rich" codes.

    Your fuel filter has the fuel pressure regulator built in. How old is that fuel filter? (They should be changed every five years or so, but this is often neglected). Spark plugs should also be less than 50k miles, and should be NGK BKR6EQUPs.

    You also need to keep more gas in your car.

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, owner of German Motors of Aberdeen
    BMWCCA 274412
    German Motors is hiring ! https://www.bimmerforums.com/forum/s...1#post30831471

  4. #4
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    The fuel filter looks fairly new I'm not positive how old it really is. I did go low on gas so I assumed that's what that code was from. So the parts store recommend bosch wasn't right?

  5. #5
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    EXOTICS
    Use what Chris recommended-NGK BKR6EQUPs

  6. #6
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    +1

    Even when you put in the P/N it comes with, NKG's come up: http://www.realoem.com/bmw/enUS/part...2+12+9+071+003
    Attached Files Attached Files
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
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  7. #7
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    Seeing this combination of fault codes would guide me to see the current values of live data on the sensors. Seems like they could be mixed up (bank 1 lean and rich?, bank 2 the same?).

    Also, for the next time, please try to keep in mind that P0171 is a different code from 171 (etc.). For MS43 unit in your 525i, the BMW code 171 would mean a completely different thing.

    I need to ask - as you were working around spark plugs. By chance, did you disconnect and reconnect anything else than the ignition coils? Did you touch the connectors for O2 sensors?

    Why I am asking - I have seen the same symptoms with a car which was fitted with a brand new engine. In the end we found out that:
    - the technician working on the car before did just remove the catalytic converters
    - flashed the ECU with the EURO 2 emission software, which does not have post-cat O2 sensors
    - at the moment of assembly they mixed the precat O2 sensors and did not have any better idea than to switch the pins in the connector of ECU

    So after assembly we put everything together as it should be, but the O2 sensors were mixed because of the previous pins switching. After a while of seeking why the engine would backfire we found it by live data on the O2 sensors. Bank 1 was too rich and bank 2 was too lean (on the post-cat it was the opposite). The ECU was trying to make a leaner bank 1 and richer bank 2, but as the sensors were mixed up, it measured the opposite results causing running into limits.
    Martin Voigts
    BMW cars indy and locksmith
    1997 E36 318iS Sierrarot
    2012 Ford Mondeo

  8. #8
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    No I didn't touch any o2 sensors or any of that.

    - - - Updated - - -

    Just got the right spark plugs in. I have a question mostly cause I have never used laser platinum plugs. Is the tip suppose to be exposed or is the white part around the tip suppose to cover it? As it is now the white part is flush with the tip. Just wanna make sure before put in

  9. #9
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    16 220i 05 325it 05 M3
    They should be flush, I am sure you purchased the NKG plugs right?
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

  10. #10
    Join Date
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    2001 bmw 525i
    Yes the ngk laser double plats. Bkr6equp ones has 4 prongs on it

  11. #11
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
    Join Date
    Nov 2010
    Location
    Grafenwoehr, Germany
    Posts
    14,483
    My Cars
    16 220i 05 325it 05 M3
    Those will work the best in that motor, so you are good to go.
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

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