Bad O2 sensor???

[Eric Valdez]

Recently I had an engine light go on so I pulled the codes to find: P0036 Heated O2 Sensor Control Circuit, Bank 1 Sensor 2 and P0141 Heater Circuit, O2 Sensor, Bank 1 Sensor 2.

So obviously I ordered and replaced the O2 sensor with a direct replacement from Bosch and even after clearing the codes they still come back and so does the engine light... Anything else that could be causing this????? Thanks!

[JFP in PA]

48 minutes ago, Eric Valdez said:

Recently I had an engine light go on so I pulled the codes to find: P0036 Heated O2 Sensor Control Circuit, Bank 1 Sensor 2 and P0141 Heater Circuit, O2 Sensor, Bank 1 Sensor 2.

So obviously I ordered and replaced the O2 sensor with a direct replacement from Bosch and even after clearing the codes they still come back and so does the engine light... Anything else that could be causing this????? Thanks!

You need to test the heater circuit wiring for both sensors, the codes indicate that the sensor isn't necessarily bad, but the sensor heaters are not working.  This is quite often a wiring issue.

[Eric Valdez]

How would I do that?

[JFP in PA]

The O2 sensor plug has multiple pins, one is the sensor signal, another is the power supplied for the heater.  I would suggest using a digital multimeter on the unplugged harness end and testing each pin for voltage with the key on, and test the heater for resistance; if there is no voltage, somewhere upstream on the harness there is either a wiring break or bad connector 9internanl corrosion), which you will have to find.

 

 

[Eric Valdez]

Thank You!

[Eric Valdez]

So I cleaned the plug on the O2 sensor and now it's giving me these codes, P0038 Above upper limit and P0141 Above upper limit...

[JFP in PA]

Have you tested the circuits as indicated above?

[Eric Valdez]

Not yet, I need to get a multi meter.