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Old 19th March 2017, 20:22   #8
polinsteve
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Join Date: Mar 2013
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Hello,
I've just used a super cheap BMW compliant reader and the fault code P1090, "Pre catalyst fuel trim system too lean bank 1" comes up. Does this make sense,is it relevant and if so does it help confirm the initial diagnosis? The code showed 30 mins after I struggled home and had disappeared when I rechecked after another 30 mins. It reappeared as soon as the engine was started. The car drove ok for the first 5 minutes or so and then started cutting out when the throttle was eased off. By slipping into neutral (auto box) before coming off the gas the engine kept running. Made for an interesting 40 minute drive home.

Last edited by polinsteve; 19th March 2017 at 20:24..
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