Errors 38, E3 and E4 on chart 15 (according to the BavAuto code reader). "Ignition feedback - shunt resistor" and "Oxygen sensor adaptation limit" on all cylinders. Previously, I had an error pertaining to the secondary air system flow being too low, which I attributed to a secondary air pump and valve. I did not replace those parts, since they seemed to have no effect on performance.
Has anyone else encountered these errors and know how to solve them?
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