Code 25 Air/fuel ratio Lean?

Hi,

A lean fuel mixture can be caused by a few different things. First and most commonly, an engine vacuum leak. If there is a leak, it allows unmetered air to get into the combustion chamber and causes a lean fuel mixture.

Next, if there is an exhaust leak before the O2 sensors, that can also cause it. The other common cause is a weak fuel pump or restricted filter.

Start by checking for a leak.

here is a link that explains how to do it:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Try that and let me know what you find.

Take care,

Joe