BMW Questions? Ask a BMW Repair Expert for Answers.
Hi there, do you have a BMW scan tool that can look at diagnosis requests of sensor values?
What are the adaptation values for bank 1 and 2, additive and multiplicative.
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Yes. 100%. A cracked valve cover causes an unmetered air leak into the crankcase system. Hence, throwing the lean code. Unfortunately the valve cover will need to be replaced which is costly.
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Lean codes are caused by two things, too much air (which could be an intake leak such as a cracked valve cover), or not enough fuel (such as clogged injectors). The way to test for injectors is to compare adaptation and smooth running values between cylinders. You will need to find a shop with a quality scan tool to do this if your tech doesn't possess one.