Check it out. I've researched this to death using the search, but I just want to see if I can get anymore possible solutions. I have a 96 civic ex coupe. That has been throwing code P0172 (System Too Rich Bank 1) I had already changed the spark plugs, air filter, , distributor cap and rotor, fuel filter, and I checked the resistance in the spark plug wires and they are ok . I just changed the primary o2 sensor, and in addition to getting p0172, I'm also getting p0170 Fuel Trim Malfunction (bank no. 1). What else could be the problem?

 

Hi so Fuel problem,bad o2,evap purge leak,map,egr,valve clearance,fuel injectors,ecm.You hit the jack pot with that code.Have run into a few, i pulled out hand fulls of hair some fix fast some take all day.Run the tree the best you can is some parts you would need to see the data list(you would need a good scanner).

 

thanks alot! Great info!