Could really use some help, 7 codes - BMW Forum -
BMW Forum BMW Forum

Auto Insurance

» Featured Product
Wheel & Tire Center

Go Back   BMW Forum - > BMW Model Specific Forums > 5-Series (E12,E28, E34, E39, E60)
Register Home Forum Active Topics Gallery / Showroom Auto Loans Garage Search Today's Posts Mark Forums Read Auto EscrowInsurance

5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum) is the premier BMW Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools Display Modes
Old 04-05-2010, 10:11 PM   #1 (permalink)
Join Date: Apr 2010
Posts: 1
gonzo146 is on a distinguished road
Could really use some help, 7 codes

I have a '99 528i running really rough. It even backfired a couple of times when cold. Current codes are p0170, 0173, 1188, 1189, 0300, 0302, 0306. I know the first 4 are fuel trim related and the other 3 are misfire codes. I just don't know where to start looking. Could the misfires be caused by the fuel trim problems? Any help would be greatly appreciated.
gonzo146 is offline   Reply With Quote
Sponsored Links
Old 04-06-2010, 09:14 AM   #2 (permalink)
Mr. Clean
BimmerE39's Avatar
Join Date: Jan 2009
Location: Danbury, Connecticut
Car: Titanium Silver E39 / 2011 BMW M3
Posts: 1,817
BimmerE39 will become famous soon enough
P1188 is BMW's fault code 227 which is saying there is a deviation in the fuel mixture between cylinder 1-3. This is a code only on M52/S52 engines running with a Siemens MS41.1 or MS41.2 DME. Some of the problems that can cause this are:

-Vacuum leak (intake gasket, crankcase breather, etc)

-Defective fuel pressure regulator

-Wrong MAF

-Defective MAF

Fault codes P0170 (BMW fault code 26) usually states there is an issue with your oxygen sensors control adaptation (injection) in bank 1.

P1188 and P1189 and P0170 are typically MAF sensor issues. Because the MAF is listed in the original fault code of P1188 I would look there first. However, don't rule out possible oxygen sensor failure.

The other codes regarding misfires are a result of the fuel related issues from the first 4 codes. Does the car misfire when warm and at idle, does it misfire when it's cold and idling, or does it misfire when accelerating. P0300 is a code for multiple random misfires and some of the areas which can cause this problem are:

Faulty spark plugs or wires
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer

Overall, I'm leaning to a possible MAF sensor issue being your best case scenario and faulty O2 sensors being your worst case scenario. Depending n your mileage, and assuming your O2 sensors have never been replaced I would suspect an O2 sensor almost immediately. I would also look to see if there isn't a vacuum leak as well. I hope this helps you out to an extent and best of luck!
BimmerE39 is offline   Reply With Quote
Sponsored Links

  BMW Forum - > BMW Model Specific Forums > 5-Series (E12,E28, E34, E39, E60)

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Need Help With Fault Codes rallen133 3-Series (E46, E90) 0 03-30-2010 04:04 PM
Need Help with Codes mybrosride 5-Series (E12,E28, E34, E39, E60) 0 05-04-2009 11:48 AM
Codes lousbmw 5-Series (E12,E28, E34, E39, E60) 0 02-03-2009 12:13 PM
Codes MichelVaillant 5-Series (E12,E28, E34, E39, E60) 4 05-10-2005 11:55 PM
Can Someone Help Me With Codes k2c69n 3-Series (E36) 11 03-12-2005 07:30 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 11:04 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.