I've had a diagnostic done on my BMW 325i E46, and been told that the fuel bank /trims are faulty. Is anyone able to tell me if this is an big job? Or expensive job to have replaced.
My car has 14020 miles.
My car has a manual transmission.
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There are a few things that can cause vehicles fuel trims to vary from normal. A vacuum leak is a big thing. Broken or worn crankcase ventilation hoses and gaskets that are failing to seal can cause lean conditions. If you have a malfunctioning ignition coil or leaking fuel injector this is another case that can throw off the fuel trims. Saying that the fuel bank / trims are faulty still means that there is some diagnosing though. You will need to have a more complete diagnosis or a more specific description of the faulty components in order to verify whether this is a small or expensive job.
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