Beretta.net

So I've got an issue. I keep getting a Code 45. For a while it runs like a damn champ, but after a couple of minutes it brings up the CEL. The O2 sensor is brand new, the pigtail and wire is brand new. I'm running a 3.1 from 93 Grand Prix and I'm running a stock computer from an 87 Beretta 2.8. Any ideas? Does this thing require a Fuel Pressure Regulator or something? I think I saw one one (or something that looked like it near the fuel rail, when I bought the motor). I'm stuck.

the fuel pressure regulator is between the two fuel rails. Sometimes they can rupture and leak fuel out of the vacuum port causing a rich condition.

i had a code 45 in my car too it was the temerature coolant sensor the one behind the thermostat my wires got heated because underneath is the exhaust manifold so changed that light went out drove like before