问：银行1太瘦了

While a bad O2 sensor can be the cause of a ’lean" fault code, it can be set for a number of reasons. A vacuum leak anywhere in the intake system can cause a lean fault as can other sensors like the mass air flow sensor. Also, any bank 1 cylinder that may be misfiring due to a faulty spark plug, ignition coil, or improperly firing fuel injector can set that fault. A certified technician can diagnose the why the检查引擎灯已经打开为了隔离设置的精益故障代码的确切原因。