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Disconnect the plug then use a 7/8" or equivalent metric wrench to un-screw the sensor from the exhaust. sometimes you have to heat the exhaust around the sensor to get it un-seized.
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it has 4 oxygen sensors they are identified as right side bank1 and bank2 and left side bank1 and bank2.... either side bank1 is on the exhaust manifold and bank2 is after the catalytic converter.... I recommend original equipment expensive but worth it.
There are four of them on your vehicle. Two before the catalytic converter and two after. Each one is going to have a different price and labor time to replace. Do you know which one needs to be replaced? Bank1 sensor1, bank2 sensor1, bank1 sensor2, bank2 sensor2? On average $50 to $100 dollars for the part. And figure an hours worth of labor.
All 3 of these Codes have to do with the O2 devices. Some are saying the heating elements are returning low signals. These elements are built inside the O2 sensors and are designed to make your vehicle get out of "rich" mode faster.
Bank2 sensor1, Bank1 sensor1, Bank1 sensor2. Check your connections and the wiring leading to these parts.
You may need to replace these O2 sensors if the wires are good.
your truck should have four o2 sensors bank 1 sensor 1 is o2 sensor on cylinder 1 side before cat and bank1 sensor2 two is 02 sensor after cat banks 2 sensor1 is on other side berfore cat and bank2 sensor2 is after cat hope that helps when they read code it should tell you bank1 sensor1 or2 good luck
Some of your O2 sensors are before the catalytic converter and some are after, based on your description. I've seen some cars that had to have all of the O2 sensors replaced when the exhaust system was replaced.
O2 sensors need a special socket to remove, and are best done when the exhaust is hot, and, also, antiseize compound should be used on the threads with the new O2 sensors.
Be prepared to have an exhaust technician change them out for you in order to get it passed the eCheck.
There are 4 oxy. sensors listed for your truck. they're located as follows
Left exaust before catalytic converter. bank1 sensor1-after cat conv.
bank1 sensor2. right exaust before cat.conv. bank2 sensor1-after cat.
conv. bank2 sensor2. Hope this helps.
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