Originally Posted by Street Legends

What kind of gas do you run? A lot of things can affect why 02 sensors fail. If you have a leak in your intake manifold then your vehicle will run lean, The 02 sensors will read that and try to make up for it and run more fuel to the engine. The extra added fuel burning through the exhaust can foul the 02's causing them to go out. Also I don't know why you would but if you run race fuel or anything like that it also ruins 02 sensors.

If they're reading high voltage is more than likely means your vehicle is running lean, which would make sense if in fact you have a leaky intake.

Once you get that fixed your vehicle should be able to produce a correct air fuel ratio.

Keep in mind that driving around on an engine that's lean can have other harmful effects like burning the piston rings or even melting a piston. You can also get detonation which destroys pistons, valves, and sleeves...

Originally Posted by varsis

yep I know, it's still running smooth though. Im picking up the intake gaskets tomorrow and doing the 1/4" aluminum plenum fix.