Ошибка P0175: слишком богатая топливовоздушная смесь (банк 2)

With closed-loop control the engine module corrects the injected fuel using the oxygen sensor: short-term fuel trim reacts within fractions of a second, long-term trim stores a learned base correction per load and speed range. Positive values mean fuel is being added because the mixture was lean, negative values mean fuel is being removed; around ±10 % is normal. P0175 is the bank 2 counterpart of P0172: long-term trim at its lower limit, mixture still rich. GM evaluates it like bank 1 with a passive test before the first purge and an active test with the purge valve closed; Ford at −25 % with purge off. Two trips, no limp mode. P0175 alone points to a bank-specific cause such as a leaking injector on bank 2; together with P0172 to fuel pressure, purge, ethanol learning on flex-fuel vehicles or fuel in the oil. GM and Ford bulletins document wrongly learned ethanol content and a purge valve stuck open as causes.