O2 Sensor Codes listed

[scrollmaster]

97 Automatic 4.0 SOHC 168,700+ miles. Had exhaust pipes, mufflers and catalytic converters replaced about year ago. They also replaced the 2 O2 sensors that were easy to reach.

I'm Getting 5 DTC errors...
P0135, P0141,P0155, P0161 - All giving Heater Circuit Malfunction with related Bank and Sensor location.
P0156 - Sensor Circuit Malfunction Bank 2 Sensor 2

What are your reccomendations

 

[bobflood]

97 Automatic 4.0 SOHC 168,700+ miles. Had exhaust pipes, mufflers and catalytic converters replaced about year ago. They also replaced the 2 O2 sensors that were easy to reach.

I'm Getting 5 DTC errors...
P0135, P0141,P0155, P0161 - All giving Heater Circuit Malfunction with related Bank and Sensor location.
P0156 - Sensor Circuit Malfunction Bank 2 Sensor 2

What are your reccomendations

If you are getting Heater Circuit codes for all four O2 sensors, I would look to a fuse first - pretty sure one fuse runs all four heater circuits. Re the P0156 - Bank 2 Sensor 2 is Driver's side behind the cat. Was that sensor replaced last time?? Check that the wiring is OK - it might have gotten misrouted when exhaust work was done.