usually 02 sensor is bad, but possibly exhaust leak or even intake vacuum leak. can get as crazy as bad injecters or fuel filter
The Downstream O2 sensor is faulty and needs to be replaced.
Trouble code P0141 means:O2 heater sensor circuit malfunction (Bank 1 Sensor 2)
Trouble code P0141 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 2)
Trouble code P0141 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 2)
Trouble code P0141 means: O2 Heater Circuit (Bank 1, Sensor 2)
Code 41 is for the alternator not charging properly.
Trouble code P0304 means:Cylinder 4 misfire detected
Trouble code P0141 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 2)
Trouble code P0141 means:O2 sensor heater circuit malfunction (Bank 1 Sensor 2)
Diagnostic code 44 means: Battery temperature sensor voltage out of range.
Fault code 16 means: Loss of battery voltage.
Code 55 is end of message. That means the computer is finished showing codes.