O2 wiring for 2004 chevy Blazer

O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)

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How To Install Replace Upstream O2 Sensor Chevy S10 ...

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Here's a link to check out. How to Diagnose P0135 Heater Performance Bank 1 Sensor 1 GM 3 5L

Code 155 is for a problem with the heater circuit in the O2 sensor for bank two. Bank two is on the side with cylinder number two.
Usually the sensor is faulty, but the heater circuit would need to be checked to be sure. The sensor has a built-in heater to get it hot quickly after starting the engine.

With a single exhaust, one in each y-pipe leg, one for each bank. Sensor 1 bank 1, sensor 1 bank 2. Sensor 2 should be after the cat. Sorry, I don't have decent picture.

Hello your po135 is o2 sensor bank 1 your po141 is O2 sensor bank 1 sensor 2 and your pO300 is random multiple cylinder misfire these problems are your oxygen sensors and engine misfire pO300 is you engine missing o2 sensors are switches in the exhaust system the engine misfires are the engines cylinders missing.

Code -P0146 - o2 circuit no activity detected,
Bank 1 senor 3
Bank 1 is going to be where number 1 cylinder is at,
It's going to be the very last o2 sensor on the exhaust pipe, check make sure it's connected, if it is more then likely bad sensor.

P0155 is o2 sensor heater circuit malfunction bank 2 sensor 1 it is the o2 sensor circuit in front of the cat converter the o2 sensors are located mounted to the exhaust pipe in front and behind the catylic converter the problem is in the circuit [wiring or sensor itself] check wiring and repair if necessary if the short or open circuit is the sensor need to replace sensor +++ P0161 is 02 sensor heater circuit malfunction BANK 2 SENSOR 2 ++++++ this is the sensor behind the cat converter

It is not a carb code as your vehicle has not carburetor. It is an OBD2 ECU code. What is means is that you have an O2 sensor heater circuit malfunction (Bank 2 Sensor 1). In your case I would recommend you inspect all the wiring going to that O2 sensor. If you find no problems then I suggest you replace the O2 sensor. The sensor to replace is on the passenger side, the sensor closest to the engine. This will more than likely fix your problem. After replacing the sensor reset the Check Engine Light. If the problem comes back then seek professional help and do not replace any other parts.

sounds like you know what you are doing, sometimes the codes have to be removed after repair, i'm not sure whether or not your vehicle requires this. If it is just a light bothering you try and clear the code and see if it comes back. Some Advance Auto or O'reilly has a tool to do this free of charge