If you are a proud owner of a 2016 Ford F-150 with a 3.5-liter engine, you might encounter issues with the O2 sensor signal. In this post, I’ll walk you through the diagnosis and repair process for this problem.
One common issue that can lead to the O2 sensor reading rich is a faulty pressure valve. The purpose of the pressure valve is to purge the gas vapor from the canister to the intake manifold for re-burning. When the valve malfunctions and stays open, excess vapor is allowed to enter the manifold, causing the O2 sensor to read a rich mixture.
To diagnose the problem, I started by checking the pressure valve. I found that it was indeed malfunctioning as it allowed air to pass through from both directions when it should have been closed.
The solution to this issue is to replace the faulty pressure valve. I was able to find a new purge valve for $50, and after installing it, the issue was resolved. I cleared the error code, and the O2 sensor signal was back to normal.
If you encounter a similar issue with your Ford F-150, I recommend checking the pressure valve as a first step in your diagnosis. Replacing the faulty valve can solve the O2 sensor signal problem and restore your vehicle’s performance.
Thank you for reading this post, and if you have any questions or thoughts, feel free to leave a comment below!