All 02 PO 141 161 code went off after replacing all 02 sensors?

Question

All 4 codes went off after changing the 4 02 sensors, I changed the both knock sensors as well at the same time. what could my issue be ?

thanks

Derek

Answer 1

P0141 02 heater circuit malfunction bank 1 sensor 2

P0161  02 heater circuit malfunction bank 2 sensor 2

These heater circuit are fuse protected, in the engine fuse box listed as 02 fuse is a 15 amp fuse,if its open a fuse replacemt is needed.

Comments

I checked that and they are both ok

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I looked at all the fuses and they are fine. I im getting codes for all 4 02 sensors.

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use a volt meter and check  B+ at the heater circuit, you will need to clear the code for the ECM restart the heater circuit operation

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What ohm should I have from the sensor ? I tested all 4 1 gave me a ohm of 14 and 7 and 4.7 at 3 of the points the other 3 o2 sensor I only get 14 ohm at 1 point.from the ecm I am getting the following Blue and br 499.1 red and bl 16.4 16.7. Bl and blue 500 wh and br 16.5

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The resistance should be about 3 to 15 ohms  across the heater terminals. What needs to be done is voltage test, With key on engine off codes cleared go to the heater ground circuit , one lead to engine ground and the other to heater ground  ,which will be the black wire ,the voltage should be 0.05 volts to 0.1 volts.