Page 2 of 2 FirstFirst 12
Results 11 to 13 of 13

Thread: P0172 P0175 System too Rich Bank 1 and 2

  1. #11
    Join Date
    Jan 2013
    Location
    Central California
    Posts
    657
    Quote Originally Posted by TripleBlackZHP View Post
    how long did it take for your CEL go away after installing a new MAF?
    I used an OBD2 scanner to clear the codes when I replaced the MAF. Before I had replaced the MAF I tried clearing the codes several times but they always returned.

  2. #12
    Quote Originally Posted by Dave1027 View Post
    I used an OBD2 scanner to clear the codes when I replaced the MAF. Before I had replaced the MAF I tried clearing the codes several times but they always returned.
    That's good to know, I've tried clearing my P0172 and P0175 codes and it does't let me clear them at all, CEL just stays on.
    2006 - black sapphire metallic - convertible - 6 speed manual

  3. #13
    So Iíve finally solved this problem, and long story short, thankfully it was just a lower intake boot (hooray!). It had a finger sized hole on the smaller tube that connects to the idle control valve(maybe why I got a rich code not a lean). I had a local BMW dealership diagnose the CEL ($200) because I was getting my airbag recall done anyways (that was free), BMW offered to do the repair for around $300 but since I can wrench got the part for $30(OEM part) online and saved myself some beer money. Engine light was cleared and it has been off for a few weeks. I've noticed the car feels smoother in first and second gear, and has more torque at lower RPM.. I started this thread a while ago but parts ordered online took forever to show up. I didn't originally suspect the intake boot because I had an e46 325ci with similar P0171 and P0174 (lean) codes and it was also caused by a ripped lower intake boot so kinda weird. Anyways if you get P0172 and P0175 CELs it maybe an air leak in the intake boots.
    2006 - black sapphire metallic - convertible - 6 speed manual

Page 2 of 2 FirstFirst 12

Similar Threads

  1. System Banks 1 and 2 too rich (P0172 & P0175)
    By NorCal-Dimitri in forum Mechanical | Troubleshooting
    Replies: 6
    Last Post: 03-04-2014, 07:27 AM
  2. Installed headers, have both rich and lean codes......
    By Smolck in forum Mechanical | Troubleshooting
    Replies: 4
    Last Post: 01-25-2014, 09:09 AM
  3. E46 BMW 330i ZHP P0172 & P0175
    By danewilson77 in forum Mechanical | Troubleshooting
    Replies: 27
    Last Post: 09-27-2012, 03:52 PM
  4. Rich@2M Auto Body checking in
    By Rich@2M in forum New Members (or older members who have not introduced themselves)
    Replies: 16
    Last Post: 01-20-2011, 08:16 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •