Have trouble code po135 on a mitsubishi eclipse,

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 problem with the heater circuit for the O2 sensor for bank one sensor one.
Code 300 is for a random miss that is not serious enough to peg a cylinder.

CODE PO135 HO2S 11 BANK 1 SENSOR 1 HEATER CIRCUIT MALFUNCTION CONDITIONS.

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.

ok code 12 means that you disconect battery recently, maybe you were trying to clear trouble code by doing that, in worst case just replace the battery not a big deal

Code 55 means "no Trouble codes found" code 55 means that thats the end of self testing codes, there is no mode code. just ignore code 55.

im pretty sure you were doing a selft testing dtc bye turning switch on and off.

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.

Fault Code P0135 Sensor Heater Circuit Malfunction (Bank1 Sensor 1)

Sugiero cambiar sensores de oxigeno: www.oxygensensors.com

Debes haber notado variaciones en el consumo de combustible, entre otros detalles (modificacion de ralenti).

Suerte.

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

P0603 Internal Control Module Keep Alive Memory (KAM) Error. This code occurs if you've altered your computer from stock settings

The error is actually P1400 Manufacture Controlled Auxillary Emissions Controls. I'm having that issue with my 2001 Mitsubishi Eclipse right now. Not to mention the bad paint job.