What does p0161 mean - 2004 Chevrolet Avalanche

https://www.obd-codes.com/p0161

That is P0161 (letter "P" and four numbers)
P0161 Oxygen O2 Sensor Circuit Low ( engine cylinder bank 2 sensor #2)
What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that is applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model.
It basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2).
A code P0161 may mean that one or more of the following has happened:

• HO2S heater power circuit open
• HO2S heater ground circuit open
• HO2S signal tracking (due to oil or moisture in the connector)
• HO2S is damaged or has failed PCM has failed

That 161 is not a valid code, you need one more number from 0-9 an example is P0161

P0161
It basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2). Symptoms There will likely be no obvious symptoms other than MIL illumination. Causes A code P0161 may mean that one or more of the following has happened: HO2S heater power circuit open HO2S heater ground circuit open HO2S signal tracking (due to oil or moisture in the connector) HO2S is damaged or has failed PCM has failed Possible Solutions Replace HO2 Sensor Repair open or short in power circuit Repair open or short in ground circuit Repair damaged connector due to tracking

As for the 0303 or the 0300 these are probably just side effects of the 0161 fault But the 0303 code means the Cylinder #3 misfired and the 0300 means that you have a bunch of random misfires going on.Make sure you go back over the engine and check all the wiring, you may have disconnected or busted a wire while changing plugs.

Hi there:

This fault code refer at Oxygen O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2), and basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2).

A code P0161 may mean that one or more of the following has happened:

• HO2S heater power circuit open
• HO2S heater ground circuit open
• HO2S signal tracking (due to oil or moisture in the connector)
• HO2S is damaged or has failed PCM has failed

Possble soutions:

• Replace HO2 Sensor
• Repair open or short in power circuit
• Repair open or short in ground circuit
• Repair damaged connector due to tracking

Use this Ford diagram about O2 sensor location...




O2 Sensor 2 Bank 2 = HO2S 2/2 (zoom image link)

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It basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2).There will likely be no obvious symptoms other than MIL illumination.A code P0161 may mean that one or more of the following has happened:HO2S heater power circuit openHO2S heater ground circuit openHO2S signal tracking (due to oil or moisture in the connector)HO2S is damaged or has failed PCM has failedPossible Solutions:Replace HO2 SensorRepair open or short in power circuitRepair open or short in ground circuitRepair damaged connector due to tracking

P0161=O2 Sensor Heater Circuit Bank 2 Sensor 2,
oxygen sensor after converter on passenger side.

If you do not know what the codes are, it is O2 sensor. This means the computer is not reading the right information from the faulty sensor. (there is a set range the sensor is meant to show, if one goes over or under the computer shows check engine). The diagnostic is not too bad, give the car a tune up, plugs, wires etc. and replace the O2 sensor. This normally clears up any problems. Let me know if you need further clarification or help.

P0161 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
check the wiring to the bank 2 sensor, that is the one behind the catalytic converter on the opposite side from the bank where #1 cylinder is located, see firing order diagram below.

p0161 is 02 sensor. bank 2 #2 p1684 is disconnect battery after 50 starts. leave battery disconnected for at least 2 min. bank 2 is right side of engine . #2 is the second 02