Thanks again for tuning in. I just got this truck not long ago and already, the diesel colorado zr2 is turning into a money pit (the bad kind). After getting a check engine light on the Colorado I ran the code and narrowed it down to the upstream Nitrogen Oxide Sensor. Assuming it was just dirty I decided to try and clean both the upstream and downstream sensors in an attempt to save money. Unfortunately the problem persisted as you see in the video and luckily I have a brand new set on the way.

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