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Oxygen sensors keep coming back as not ready?

Tiny
RAH12
  • MEMBER
  • 2017 NISSAN SENTRA
  • 60,500 MILES
My oxygen sensors keep coming back as not ready when I go for inspection, they tell me to drive more but I've driven 200 + miles and it's the same.
Saturday, October 14th, 2023 AT 4:46 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Does the engine temperature gauge stay on cold too long? If you don't have a gauge no worries, if the thermostat is stuck open the OBD2 system will not run through the monitors therefore the oxygen sensor will not be ready. Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/replace-thermostat

Check out the images (below). Please let us know what happens.
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Saturday, October 14th, 2023 AT 6:12 PM
Tiny
RAH12
  • MEMBER
  • 2 POSTS
I don’t believe so I observed yesterday it only took a few minutes for the temperature gauge to start going up.
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Monday, October 16th, 2023 AT 8:53 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Okay, lets run the codes to see if any are stored.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please go over this guide and get back to us.

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Monday, October 16th, 2023 AT 9:52 AM

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