The first thing I would do is check for vacuum leaks. Most likely the cause of the codes 171 and 174 will also be the reason for codes 1131 and 1151. Make sure the air inlet tube from the air filter to the throttle body is secure and has no rips or tears. Do you have a tool that can display the codes and data? I know you stated you have no special tools. What have you checked so far? |