P2270 means the downstream oxygen sensor on Bank 1 is reporting a signal that stays lean. The sensor or its wiring may be at fault, but an exhaust leak or engine-running issue can also skew the ...

P0141 identifies a fault in the heater circuit for the downstream oxygen sensor on Bank 1, Sensor 2. A failed sensor is possible, but a fuse, connector, or damaged wire can produce the same code, so ...