P0300 Ford -2006 ford taurus

Question

Changed plugs,wires, fuel filter. Cleaned system with sea foam. Cleaned MAFS. Changed O2 sensor that was suspect. Stil idling low, won't stay running unless I keep my foot on the gas. What should I try next?

Answer 1

Hi there,

With the codes you are showing it looks like it's possible the bank 2 catalytic converter is plugging up. If it is, it will cause a lean condition on bank 2, this would be the 174 code this in turn is going to cause a multiple misfire code because chances are bank 2 is to lean so all of the cylinders on that bank could misfire. I would remove the upstream o2 sensor from bank 2 and see if there is better performance.