2013 Chevy Avalanche Engine 5.3 Having 02 issues

[rudf]

I have changed all coil packs, plugs and wires. and Oxygen sensors also the 02's were aftermarket and not OEM what could be my issues with all these codes (not to Worried about Oil Pressure switch)  all wiring to 02 sensor including voltage seems to be good . Thanks in advance for any or all help. 

 

 

Car Scanner ELM OBD2

DTC report

Selected brand: Chevrolet

VIN: 3GNTKFE79DG292059

 

============1==============

P0050

Raw code: 0050

ECU: Engine control unit

Status: Confirmed

OBDII: Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit malfunction

 

============2==============

P0056

Raw code: 0056

ECU: Engine control unit

Status: Confirmed

OBDII: Heated oxygen sensor (HO2S) 2, bank 2, heater control - circuit malfunction

 

============3==============

P0155

Raw code: 0155

ECU: Engine control unit

Status: Confirmed

OBDII: Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit malfunction

 

============4==============

P0157

Raw code: 0157

ECU: Engine control unit

Status: Confirmed

OBDII: Heated oxygen sensor (HO2S) 2, bank 2 - low voltage

 

============5==============

P0161

Raw code: 0161

ECU: Engine control unit

Status: Confirmed

OBDII: Heated oxygen sensor (HO2S) 2, bank 2, heater control - circuit malfunction

 

============6==============

P0521

Raw code: 0521

ECU: Engine control unit

Status: Confirmed

OBDII: Engine oil pressure sensor/switch - range/performance problem

 

============7==============

P0151

Raw code: 0151

ECU: Engine control unit

Status: Pending

OBDII: Heated oxygen sensor (HO2S) 1, bank 2 - low voltage

 

============8==============

P015D

Raw code: 015D

ECU: Engine control unit[Archive (inactive)]

Status: Permanent

OBDII: Heated oxygen sensor (HO2S) 1, bank 2 - delayed response lean to rich

 

============9==============

P0174

Raw code: 0174

ECU: Engine control unit[Archive (inactive)]

Status: Permanent

OBDII: System too lean, bank 2

 

============10==============

P0050

Raw code: 0050

ECU: Engine control unit

Status: DTC supported by calibration, Current DTC, Test failed since DTC cleared, History DTC, Current DTC since power up, Warning Indicator Requested

OBDII: Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit malfunction

General Electrical Failures [0x00]

============11==============

P0056

Raw code: 0056

ECU: Engine control unit

Status: DTC supported by calibration, Current DTC, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up, Warning Indicator Requested

OBDII: Heated oxygen sensor (HO2S) 2, bank 2, heater control - circuit malfunction

General Electrical Failures [0x00]

============12==============

P0155

Raw code: 0155

ECU: Engine control unit

Status: DTC supported by calibration, Current DTC, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up, Warning Indicator Requested

OBDII: Heated oxygen sensor (HO2S) 1, bank 2, heater control - circuit malfunction

General Electrical Failures [0x00]

============13==============

P0157

Raw code: 0157

ECU: Engine control unit

Status: DTC supported by calibration, Current DTC, Test failed since DTC cleared, History DTC, Current DTC since power up, Warning Indicator Requested

OBDII: Heated oxygen sensor (HO2S) 2, bank 2 - low voltage

General Electrical Failures [0x00]

============14==============

P0161

Raw code: 0161

ECU: Engine control unit

Status: DTC supported by calibration, Current DTC, Test not passed since DTC cleared, Test failed since DTC cleared, History DTC, Test not passed since current power up, Current DTC since power up, Warning Indicator Requested

OBDII: Heated oxygen sensor (HO2S) 2, bank 2, heater control - circuit malfunction

General Electrical Failures [0x00]

============15==============

P0521

Raw code: 0521

ECU: Engine control unit

Status: DTC supported by calibration, Test failed since DTC cleared, History DTC, Current DTC since power up, Warning Indicator Requested

OBDII: Engine oil pressure sensor/switch - range/performance problem

General Electrical Failures [0x00]

============16==============

P0151

Raw code: 0151

ECU: Engine control unit

Status: DTC supported by calibration, Test failed since DTC cleared

OBDII: Heated oxygen sensor (HO2S) 1, bank 2 - low voltage

General Electrical Failures [0x00]

 

 

[Jsdirt]

Your answer is right there in the code description. "CIRCUIT MALFUNCTION" - that's not a mechanical problem - it's a circuit problem. You need to check the wiring from the plug to the ECM for a short.

[rudf]

Ok Thanks I checked that yesterday and found no issue and no shorts, but i will try to track it down a little more, is there a common ground to these? Also I am getting not short fuel trim on bank 2 sensor 2 on my reader; so another words flat lined  so no reading what could cause this. Thanks again. and do you have wiring diagram of the 02 sensor layout? 

Also I am getting good voltage according to my reader on bank 2 sensor 1&2

 

I also forgot I have snapon 12/24v test light and power probe will this help? 

 

 

Edited March 9, 2023 by rudf

[Jsdirt]

Flat lined means either the sensor is completely dead, or wiring shorted, or blown fuse. As I said, betting on a shorted wire. Power Probe will easily find that. Power on one side, signal (lower varying voltage) on the other. If you've got no power, that'll flatline it too. That's fused power, labeled as such (usually).

 

Test light will work for testing the heater circuit (the 2 wires of the same color) - it's a pulse-width modulated (PWM) circuit, so you should see blinking / flickering of varying speed if that circuit is working. You'd have a code for that, though - your code is for the sensor wiring, not the heater circuit wiring, so I wouldn't worry about that yet.

Edited March 9, 2023 by Jsdirt

[rudf]

Thanks for your help on this ! I apricate the patience