Not today, but last month Frau Blücher kept throwing "Bank 1/2 too rich" codes. No noticeable excess fuel exhaust smell, fuel mileage is the same (not great), no roughness or stumbles. Codes would reset then come back within a day.

Prior owner had replaced a shitton of fuel system parts including injectors. No idea if he had access to ISTA etc. to reset adaptations. Disconnected the battery for 30min, some SES and other dash weirdness on restart but that all went away after a minute or two.

No more rich codes!

Still getting the t-stat code... "P1620 Map Cooling Thermostat Control Circuit Signal High" jiggled the wire but that connector is super-hard to access without removing stuff. Maybe that will be my winter break project. No overheating, underheating, cabin heat is fine (or was last winter anyway). No warning lights from this code either.

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