Bad 02 Sensors?

[239]

I suspect that my 02 sensors may not be working. I cleaned my IAC valve a few months back and I used RTV silicone gasket maker...yeah, I read a thread on here that said silicone is really bad for the 02 sensors. I don't have a very good idle at the moment, not bad just not right. I've already replaced the MAF, cleaned the IAC and the only thing I can think of now is either a bad intake gasket or the 02 sensors. I got lean on both banks when I got my codes read, could the sensors cause this?

 

[rickybobby]

the o2 sensors could, but being both banks, a bad intake gasket is more likely the cause

 

[239]

the o2 sensors could, but being both banks, a bad intake gasket is more likely the cause

I'll have to check it out, the gasket's probably really hardened by now anyway being stock at 160,000 miles. Man I really hope it isn't the lower intake gasket though that's a whole different repair. Thanks for your input.