2007 Chevy Tahoe check engine scan codes: P0030, P0053, PO135 ~ Please advise or help : ( thought that advanced auto would have been a bit more helpful than handing me a piece of paper with codes and telling me to look them up on their site that is not a working site : (

There is a fault with the inbuilt heater in the oxygen sensor, before the catalytic converter, on the exhaust pipe the same side of the engine as cylinder 1. The oxygen sensor has four wires within the cable sheath to the top of it. Two of the wires will share the same color. These wires supply power to an internal heating element wire within the sensor. Follow the cable from the oxygen sensor to the connector, you can do a lot testing here. Check the resistance between the two 'same coloured ' wires. The resistance is low, somewhere between 1 and 10 ohms. If there is no continuity (infinite resistance) then this is the fault and the sensor needs to be replaced. The codes: P0030 the oxygen sensor heater relay is at fault P0053 Oxygen heater resistance error P0135 Sensor 1 bank 1 error You are looking at replacement. A further confirmation take the connection from sensor 1 bank 1 and swap it with the sensor 1 bank 2 on the other side of the engine. The codes should 'transfer' and show P0036; P0059 and P0141.

30 is bank 1 sensor 1 heater ciruit, 53 bank 1 sensor 1 heater resistance, 135 bank 1 sensor 1 heater malfunction. I would dare to say that the heater circuit is out on that sensor. Check the wires at the plug before you replace the sensor, they tend to break there.