95 Engine Error Codes - P0141,P0135,P0125 (1 Viewer)

[farmdwg]

I just bought a 95 and I had the codes read today.

P0141
P0135
P0125

I have the records that both of the O2 sensors were replaced 6 months ago. Could the P0125 cause the other two? Not sure why the O2s would be acting up again.

Any ideas?

Thanks.

 

[rockclmbr]

FSM says:

P0125 = Insufficient Coolant Temp. for Closed Loop Fuel Control

P0135 = Heated Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P0141 = Heated Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)


These three codes go hand in hand and point to the following Trouble Areas:

- Open or short in heater circuit of heated oxygen sensor
- Heated oxygen sensor heater
- ECM

The service manual suggests checking the resistance of the Heated Oxygen Sensor Connector.

Anyone else want to chime in?? I know many have had O2 sensors go bad, but if they were replaced is there a chance they could go bad again or could it be the connectors??

 

[Beowulf]

I have the records that both of the O2 sensors were replaced 6 months ago.

Were the O2 sensors replaced with Toyota parts? If not, that could be the problem. Most that have used non-OEM O2 sensors have run into wiring problems.

-B-

 

[farmdwg]

Thanks for the info. I have a feeling that the PO used cheaper parts.

 

[farmdwg]

Update:

2 New Toyota O2 sensors and I am back up and running.