Specs: 2000, Dakota, Quad 4.7 SLT, 105K miles. EFN: YCRXT0287232
History: Replaced Bank 1 Pos 2 O2 sensor a few years ago. No P0420 light,
after getting one. It took care of problem. No overheat problems, no loss of power, no excessive gas us.
Recently P0420 code showed up again. I had...