2006 Honda Accord Check Eng P0141 Heater circuit fault B1 S2

 

© DenLorsTools.com  Summary: Auto repair article with information on the Honda Accord check engine light with a fault code of Po441 or P0135. Code definition and location of sensor when this code is stored in the vehicles computer. Car repair tips including how to access electrical plug for oxygen sensor past catalytic converter and which type of specialty is used for the sensor.

 

OBD II fault code P0141 definition. The error/fault code is for Bank 1 Sensor 2 means that the heated circuit built into the O2 (oxygen sensor) is not functioning as designed – usually an open or shorted circuit. Fault code P0135 has the same definition except it is Bank 1 Sensor 1 which is the sensor before the catalytic converter on a four cylinder. Before the cat on side of engine that has cylinder #1 for 6 cylinders. Normally the O2 sensor is heated up internally to lower the amount of time it takes to reach operating temperature and go into “closed loop.” Vehicles naturally are more efficient when the computer has control of fuel mixture and this is best when the system is in closed loop. With the heater built into the sensor, the car can go into closed loop faster than if it had to wait until the heat of the exhaust warmed the sensor enough for it to work. If the computer sees that it takes too long to go into closed loop and parameters for other circuits (like coolant temp.) are within specification, it will trigger a warning and command the CEL (Check Engine Light) to come on.

 

 

Oxygen sensor wrenches and sockets are available to make changing them easier. If the sensor is out in the open, a regular 7/8″ wrench can be used to replace the sensor. Otherwise, specialty tool like an O2 sensor wrench or socket makes removal and installation easier. Sometimes the heat shield can make it more difficult to access. Most sensors require 7/8″ although there may be a few exceptions. The oxygen sensor past the converter on the Accord pictured has a long wiring harness that goes through the floorboard, with the plugin located underneath the right passenger seat. Moving the RF seat all the way forward eases access to the plug. Note that 4 door Accords and 2 door models have different length wiring harnesses. If using ant-seize on the threads of the replacement O2 sensor be careful not to get any on the sensor end, this may affect readings. With a scan tool and a few simple tools usually this repair can be performed by anyone with moderated mechanical skills.
  

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