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Sadly people don't know that trouble codes only tell the mechanic what to test, not what to replace. And auto parts stores are in the business of selling parts, not giving advice.
Code 135 means there is a problem with the heater inside the o2 sensor for bank one in front of the catalytic converter. Code 141 means the same thing for the o2 sensor after the cat.
Since it is very rare to have two O2 sensors fail at the same time, chances are the problem is lack of power going to the sensors.
The power circuits would need to be checked which requires a shop manual to get the testing procedures and wiring diagrams.
Code 135 is for a faulty heater in the O2 sensor. Since you have replaced the sensor the problem is probably the circuit or the power source for the heater. You'll need to check the heater circuit next.
Maintenance schedules are usually not on a yearly schedule. They are based on miles or months (whichever comes first) and what services are required depend on how much you drive your car. If you down load a factory service manual it will tell you at what mile/month intervals to do maintenance.
check the fuses under hood and under steering wheel inside the car,if that dont help you will have to change the switch on the drivers door panel,double check if its connected tight.please leave comment,vote,note.thankyou