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Fuel trim bank 2 adaption limit, Starts great, runs great.

Customer Question
Fuel trim bank 2 adaption...
Fuel trim bank 2 adaption limit
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: Starts great, runs great. Good mileage on freeway, 17 mpg in stop and go traffic.
JA: What is the model/year of your BMW?
Customer: 2003 BMW 330xi
JA: Are you fixing your 330xi yourself? What have you tried so far?
Customer: Yes, full tune up, spark plugs, fuel pump, fuel filter, o2 sensors, etc..
JA: Anything else you want the mechanic to know before I connect you?
Customer: The check engine light only comes on at about 500 miles, but if I use the Schwaben reader I see the fault right away
Submitted: 1 year ago.Category: BMW
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10/1/2016
BMW Mechanic: Steve, BMW Expert replied 1 year ago
Steve
Steve, BMW Expert
Category: BMW
Satisfied Customers: 24,852
Experience: BMW Expert
Verified
Hello and welcome,
My name is ***** ***** it will be my pleasure to assist you today.
What else has been replaced other than what was listed?
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Customer reply replied 1 year ago
Belts, pulls, cooling system, that sort of stuff. It looks like the previous owner d
Had the oil separator upgrade done. There does not seem to be any air leaks - used the brake cleaner method to check
Customer reply replied 1 year ago
Let's just chat for now. It's easier be cause I am in my office today
Customer reply replied 1 year ago
Is there a way to use the Schwaben tool to check the individual components...?
BMW Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: BMW
Satisfied Customers: 23,498
Experience: ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
Verified

Hello and welcome to JustAnswer!

If it's only setting a code for one bank the problem is usually an inaccurate upstream oxygen sensor.

What is the actual P code setting?

You mentioned oxygen sensors. Were they replaced? If so, which ones and where did the replacements come from?

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Customer reply replied 1 year ago
Hello, and thank you for your reply.
The code I am seeing is P0173 (E4).
The car in question - 2003 BMW 330xi has ~ 137,000 miles on it and I replaced all four (4) O2 sensors using the O2 sensors from my other car - 2001 BMW 330i. The sensors had approx 90,000 miles on them and they were not tripping codes while in the 2001. I plan on experimenting with the Schwaben code reader at lunchtime to the see if it tells me anything.
Thanks for any insight you can tell me...
Rodney
BMW Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

I'm a full time tech and at work this afternoon, I'll get back to you as quickly as I can.

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Customer reply replied 1 year ago
Okay thanks.
At lunch I ran through a series of scans with the car on and the engine not running and then tried with the engine idling. No codes were present. I plan to try again tonight after driving back to my apartment from work. I am thinking the P0173 code will return after some actual driving. Thanks for your help.
BMW Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Can you double check the code? P0173 isn't valid.

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Customer reply replied 1 year ago
The code is actually E4 on the Schwaben and the Peake code readers.
P0173 is the code found in the Haynes manual and all over the Internet for a Fuel trim malfunction bank 2. That is the system tried to go outside the limits to adjust the fuel mixture
BMW Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

I need to know the actual P code number shown on the scan tool or code reader.

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Customer reply replied 1 year ago
P-0173
Customer reply replied 1 year ago
Or P-0170
BMW Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

Neither of these are valid for this vehicle.

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Customer reply replied 1 year ago
What scanner are you using and do you have the correct vehicle..? This is a 2003 330xi. Please Google the codes and see what it tells you.
Customer reply replied 1 year ago
Both of these codes are listed in the Haynes and Bentley workshop manuals for the year, make and model of my car.
BMW Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

The vehicle information posted is 2003 BMW 330xi. I'm referencing the factory service information.

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Customer reply replied 1 year ago
Sir, I am not a factory or dealer technician and I do not have access to the factory scanner. But if you are a full time tech, I think I have given you enough information to know what I am asking. Have you Googled the P codes I suggested...?
BMW Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago

I have the factory service information for the vehicle in front of me, searching the internet for codes not applicable to the vehicle wouldn't be beneficial. I too will leave your question open for others.

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BMW Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago
CHRIS ZAPANTIS
Category: BMW
Satisfied Customers: 159
Experience: AUTO TECH at G&M EXXON
Verified

Hello my name is ***** ***** I will assist you. can you read your fuel trims with your reader? Usually on a BMW you will get this for a vacuum leak of some sort.

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Customer reply replied 1 year ago
Thanks Chris when I get home I'll try I'm pretty sure it will
BMW Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Great well get to the bottom of this

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BMW Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

The first thing you can check is for vacuum in the dipstick tube shouldnt be more than 1/2 inch of vacuum. If you can feel it its propably too much.

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BMW Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

If you can hear and feel it you will need to change the crankcase ventilation valve (pcv).

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BMW Mechanic: CHRIS ZAPANTIS,
 replied 1 year ago

Write down long and short term fuel trims value for me I will check in early tomorrow morning will be on again tomorrow night.

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Customer reply replied 1 year ago
Here is what I found on my Schwaben scanner. At Idle
Adaptive Mixture additive bank 1 = 0.02
Adaptive Mixture additive bank 2 = 0.03
Adaptive Mixture bank 1 = 11.7% multiplicative
Adaptive Mixture bank 2 = 12.0%
Multiplicative
Idle Adaptive w/air conditioning -1%
Idle speed integer -2.7
Air adaptive w/o drive position 0.6
Air adaptive w/ drive position 0.0
Customer reply replied 1 year ago
Is this the information you asked for...?
Customer reply replied 1 year ago
Here is what I found on my Schwaben scanner. At Idle
Adaptive Mixture additive bank 1 = 0.02
Adaptive Mixture additive bank 2 = 0.03
Adaptive Mixture bank 1 = 11.7% multiplicative
Adaptive Mixture bank 2 = 12.0%
Multiplicative
Idle Adaptive w/air conditioning -1%
Idle speed integer -2.7
Air adaptive w/o drive position 0.6
Air adaptive w/ drive position 0.0
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CHRIS ZAPANTIS
CHRIS ZAPANTIS
CHRIS ZAPANTIS
Category: BMW
Satisfied Customers: 159
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Experience: AUTO TECH at G&M EXXON

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