I got a check engine light on cold start for code p1151 after 5 minutes of it running. I do have a catless exhaust system no o2 sensors so can this be why im getting the code? Thing is I never got a cel on before and i been driving the car for the past couple of days with a catless exhaust system but it seemed to come on ever since it got colder outside.
2002 Ford Mustang GT
2002 Ford Mustang GT