Cel light on for Code p1151 need help

[boostedtsiawd]

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

 

[CharBaby]

Absolutely! I'll bet that's what your problem is. When you mess with the vehicles emissions, this is what happens. A couple of days sounds about right.

 

[Lubener]

How do you get by with emission tests?

 

[Kira]

P1151=Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2.

Drive it and see if other codes -for the other removed sensors- follow.