BMW Engine Light Questions And Answers

Welcome to the BMW engine light Question and Answer Page! This page should save you some time from submitting a duplicate question and having to wait for a response. We will include the model in most questions, so you can use the "Find on this page" function of your browser's "Edit" menu to get relevant info for whatever check engine light concerns you may have.

For instance, just type in "740i" and search for responses relating to this vehicle. You could also type in a BMW engine light code number by itself such as "P1175" to get all related responses for this trouble code. Just keep hitting "Find next" to go through all relevant check engine light responses. We don't recommend including a model year as this may make your search too narrow, and you may miss out on some relevant posts. Our BMW engine light resources cover a very wide range of concerns, but if you can't find what you're looking for through these links or our code listings, then visit the check engine light "Get Help" link on the navigation bar. As always, all repairs should be attempted only by a qualified individual. Please read our Disclaimer before getting started. Thanks for stopping in, and we hope you have found something helpful from our site!

Question:
I have a 1996 BMW 740i. I would like to know if you have more information about check engine light code P1175 Fuel Trim Adaptation Additve Bank 2 Malfunction. Could you also please tell me what the possible solutions are? Thank you.

Answer:
Thanks for contacting us with your BMW check engine light question! This code means that the computer has been unable to maintain the correct air to fuel ratio on bank 2. This code is set when the computer sees fuel trim at greater than 22.5% for longer than 2.5 seconds continuously. In other words, the computer keeps adding fuel by increasing the pulse width (open time) of the fuel injectors, but it can not obtain a correct mixture. The correct air to fuel mixture is 14.7:1 and is called stoichiometric. This has to happen while the fuel control system is in closed loop operation, meaning that the vehicle is already warmed up, and it must happen on 2 driving cycles before the light is turned on. The possible causes are numerous and include, but are not limited to, faulty fuel injectors, vacuum leaks, misfire concerns, uncommanded EVAP flow, unregulated EGR flow or oxygen sensor concerns. Please take a moment to read our article on Oxygen Sensor Diagnosis to get a bit more understanding of these types of issues. After reviewing this info, I would recommend having a foreign auto shop or BMW dealer take a look at it. Thanks, and let me know if you need any further assistance!
Mike
www.engine-light-help.com



Question:
Hello. I am looking for some help with a BMW Engine Light Code P1193: Post-Catalyst Fuel Trim System Bank 2. Can you provide any additional information on this code. I had several codes in the computer on this vehicle and managed to get them all cleared except this one. I had codes for O2 heaters on bank 2 for the front and the rear, replacing the sensors took care of these codes but P1193 remains. Any insight you can give is appreciated.

Answer:
Thanks for contacting us with your BMW engine light question. It appears that BMW doesn't offer information for this particular code to aftermarket sources, or at least none that we can find, so it may need to go to a dealer. I can give you my opinion on this however. Based on the code description it would seem that the computer has determined that there is an issue with the readings from the sensor (monitor) behind the catalytic converter for bank 2. Where you have already replaced this sensor, we can likely rule this component out. This means that the catalytic converter may be degraded and not performing up to spec, or there may be a wiring issue between the sensor and computer. It is also possible, but not likely, that there is an internal computer concern. The last possible concern is a software issue. There may be an updated operating strategy from the manufacturer, but again, this can only be done through a BMW dealer. I hope this information is helpful. Again, thanks and have a great day! Be sure to contact us with any future BMW engine light concerns!
Mike
www.engine-light-help.com

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