Unfortunately there is no fixing an O2 sensor. If the "check engine" light is on due to an O2 sensor, it can only be remedied by replacing the bad sensor.
You need to get a die that fits. Probably cheaper to buy the sensor
Check the O2 sensor(oxygen sensor) AFTER the catalytic converter
you take it to the people to fix it.
The only thing you can do to them is change them.
Replace it. Sensor 2 is the one AFTER the catalytic converter.
The oxygen sensor on a Saturn can be found in the exhaust manifold at the front of the engine. It simply unscrews and unplugs. 5 minute fix!
New oxygen sensor
The outward appearance of a defective oxygen sensor is no different than the appearance of a brand new one. The components that fail are internal and cannot be repaired ... direct replacement is the only fix.
The only fix is to replace it. If you are mechanicly inclined, this is a doable deal. Before you replace the sensor you should check the wiring for resistance you can use a volt/ohms meter (vom) and test the continuity of the wiring to the sensor.
Code P0135 means upstream oxygen sensor heater circuit problem right cylinder bank. Did you clear code after replacing the oxygen sensor?
There are two oxygen sensor for Mitsubishi Outlander. Front Oxygen Sensor and Rear Oxygen Sensor
P0125 is about coolent temp. sensor the problem is not the coolent sensor. When you have lazy Oxygen sensor you get this code. It is sensor 1 but you need to find out which bank, the only way you can find this out by snapon scanner.