I have been battling error codes now with my in-laws 2005 Liberty 3.7. We now have a P0420 error. I had recently replaced the Bank 1-1 O2 sensor for previous error code and now have this one. Any ideas?
New info: Recently cleared codes and we are now in a bind to get the truck to pass emissions. We found the new code came up of P0038. I replaced the downstream Bank 1-2 O2 sensor and am awaiting feedback from them to see if there is any other errors. I found that the error we were now getting means that it was this O2 sensor going. They have almost 200K on the jeep and only have changed O2 sensors on driver's side, normal 3K oil changes, air filter, and the PCV valve. I am actually surprised they haven't had any other issues.
Last edited by mzamiska; 03-02-2014 at 12:51 PM.