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Steve, BMW Expert
Category: BMW
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Experience:  BMW Expert
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97 bmw 740il 4.4 codes 147 electronic thermostat control, 26

Customer Question

97 bmw 740il 4.4 codes 147 electronic thermostat control, 26 part load fuel trim 1 limit reached, 34 part load fuel trim 2 limit reached. Common causes? Where do I start?
Submitted: 12 months ago.
Category: BMW
Expert:  Steve replied 12 months ago.

I will provide an honest answer. I trust this will be appreciated. Please remember that a low rating PUNISHES me for being honest and that I receive nothing for my time until a positive rating is clicked.
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147 electronic thermostat control - usually just a failed thermostat

26 & 34 - usually an air leak, failed crankcase ventilation system causing an air leak, failed airflow sensor or o2 sensors

I would start with a new thermostat and checking for air leaks and a crankcase vent system error.

Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.