Hi,
The P0420 indicates the catalytic converter is operating below the threshold. The P2173 is indicating an engine vacuum leak. The two can be related.
First, I need you to check something for me. If your scan tool has live data, check the short-term fuel trims when the engine is at operating temperature and at idle. Let me know what they are.
If you don't have that option, start by checking for possible engine vacuum leaks. Also, check the PCV valve and hose to make sure they are connected on both ends and the hose isn't cracked. See pic below.
Here is a link that explains how to check for a vacuum leak:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
One last thing. Confirm there are no exhaust leaks before the catalytic converter.
'
Let me know what you find or if you have questions,
Take care,
Joe
See pic below.
Image (Click to make bigger)
SPONSORED LINKS
Saturday, April 13th, 2024 AT 7:29 PM