Hey guys, I took my truck to a Toyota dealership to diagnose a check engine light, and they told me its the sensor on bank 1 sensor 1. They told me the exhaust system was too rusty to replace just the sensor, because trying to "force it" may cause more problems. I am not mechanically inclined at all, so I have no idea if this is true or not. They recommended putting in a whole new exhaust system into the truck at the cost of around $5,000. Does anyone have any slightly cheaper recommendations? Is this even necessary, or will the truck run fine with the sensor error? Apparently the frame is pretty ok, just the exhaust is rusted.