Code problems...

need help terrible bad i have a BMW 1999 328ic e36 i went to o reillys to have them scan the obd2 to see if there gitting the same codes i was thay did the same 4 codes # 1 p1189 fuel con bank 2 sensor 1 #2 p0173 fuel trim bank 2 #3 p1188 fuel con bank 1 sen 1 #4 p0170 fuel trim bank 1 ok thay told me i needed 02 sensors so i got 2 new sensors started it up ran it the same 4 codes thay gave me a list to go down this is what i did i put new o2 sensors a new pcv/ccv valve and all new vacume lines and cleaned intake lines i even put a new o ring on the oil dip stick THATS RIGHT THE SAME DANG CODES 4 OF THEME SO WHAT THE HECK DO I DO NOW NEED YOUR HELP IN A BAD WAY WHAT PARTS DO I NEED TO ORDER FROM YOU AND HOW FAST CAN I GET THEM JOSEPH BAUGH 623 234 1732 0r joeyb1960@gmail.com help

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This post was auto-generated based upon a question asked on our tech article page here: Pelican Technical Article: Reading BMW OBD-II Fuel Injection Systems

[Wayne 962]

It's nearly impossible to diagnose a problem like this over the Internet, unfortunately. The first thing I would do is get the PEAKE Research diagnostic tool and plug it into the card to see if you can get a better code than the ones that they read at your local auto parts store. In general I would guess that these codes might be caused by a vacuum leak somewhere in the intake. Your car is now 15 years old, and I predict that some of the field are beginning to wear out. The default action of replacing oxygen sensors is a common diagnosis by sales reps at local auto parts stores. It sounds like the car may need some professional diagnosis have a qualified mechanic in order to get this problem fixed

- Wayne

[Manolito]

Do I understand correctly that you have now replaced all four oxygen sensors? The codes tend to point to the top sensors but if the lower ones have over 100k miles, they are due as well.

First thing to check is the air path from the mass airflow sensor to the throttle body. Take that plastic and rubber air path tubing out and examine it. Also examine the tube to the idle air control valve (hard to see). While your air path is out, look to see how dirty the throttle body is. Clean the throttle body and the idle air control valve with carb cleaner spray if dirty.

You could use the carb cleaner to clean your mass airflow sensor (I have), but it is better to buy spray that is made to be MAF safe. MAF spray is not very effective at cleaning, but much safer for a MAF.

While examining the air path tubing, check the air filter box for obstruction (e.g. a rodent nest). Someone on CarTalk the other day discovered that a pack rat had been storing huge quantities of sunflower seed shells in their car.

How does the car run? If it idles smoothly and does not surge, then you probably don't have a vacuum leak.

[onegigtbird]

1993 325Is check engine light and on my OBC code 2091? camshaft position sensor