System Too Rich (Bank 1), CODE P0172
 

Hi
I’ve got the “check engine” light on and it shows code P0172 – system too rich. When reset it, it comes back after a few miles (I think usually when the car idles for a while, getting warmer...?). Other than the annoying light and higher than normal gas mileage, there are no other symptoms. This is a 1.6L Protege 99. Has anyone experienced this? Where to begin with troubleshooting? What's Bank 1?
Someone told me the fuel cap (faulty, defective) may sometimes cause this problem. I don't see anything wrong with the gas cap, it closes tight, so I'm not sure if I should try a new one.
Could somebody offer some ideas?
Thanks in advance

RE: System Too Rich (Bank 1), CODE P0172
 

Sorry not to be able to answer your question, but i have a question of my own...whats wrong with your cars system being to rich?

RE: System Too Rich (Bank 1), CODE P0172
 

I suppose nothing wrong except for, as I said, the annoying warning light and fewer miles less per gal. I just think there's got to be a reason the check light is on and I wonder what it might be...

RE: System Too Rich (Bank 1), CODE P0172
 

Posted in the Protege section.

RE: System Too Rich (Bank 1), CODE P0172
 

^post count is 1111...cool