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Discussion Starter #1
I got my Xb 6 or 7 months ago and know I get a p0138 02 problem I have changed it out twice With 2 different types and it keeps coming back any help will be greatly appreciated
 

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Faulty Rear Heated Oxygen Sensor Bank 1 Rear Heated Oxygen Sensor Bank 1 harness is open or shorted Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection Intake air leaks Exhaust gas leaks Inappropriate fuel pressure Faulty fuel injectors

Read more: https://www.autocodes.com/p0138_toyota.html
check for 12v on the O2 sensor heater circuit could be a blown fuse!

---------- Post added 05-23-2019 at 11:19 PM ----------

here is a website to find parts for Toyota vehicles http://www.toyodiy.com/ & it's free!!
 

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Discussion Starter #3
Faulty Rear Heated Oxygen Sensor Bank 1 Rear Heated Oxygen Sensor Bank 1 harness is open or shorted Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection Intake air leaks Exhaust gas leaks Inappropriate fuel pressure Faulty fuel injectors

Read more: https://www.autocodes.com/p0138_toyota.html
check for 12v on the O2 sensor heater circuit could be a blown fuse!

---------- Post added 05-23-2019 at 11:19 PM ----------

here is a website to find parts for Toyota vehicles http://www.toyodiy.com/ & it's free!!
I tried installing a new colder intake new throttlebody gasket clean there air intake sensor new spark plugs still getting the same P0138 code only thing I can think of is getting a direct OEM replacement 02 sensor I really don’t know what else to do to resolve the issue
 

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The car runs perfectly fine but my gas mileage has gone down quite a bit I thought it might be the catalytic converter but the car doesn’t Ron bad at all
 
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