Hey guys, I have a 2007 lexus is350 and I started noticing that the gas mileage was getting worse and the acceleration was slower. I kept driving it and eventually I went into sport mode and it started misfiring in most cylinders and the car went into limp mode. I checked the codes and had P0300 for the multiple misfires, and P2237 and P2240 which are air fuel related. I replaced all the coils and spark plugs. The car starts and drives fine until I go back to high rpms. I did notice that the Fuel Pressure was reading 2149 PSI at startup which seems high to me so I’m thinking it’s either High Pressure Fuel Pump or Fuel pressure related. If anyone has ideas please let me know!

 

Hey there, I am on the same boat for GS 350 2007, changed plugs, swapped coils, cleaned injectors too but no luck for the P0303 and poor gas mileage, also getting P2237 and P2240 hoping it is the bank 1 A/F sensor 1 since cylinder 3 keeps misfiring, will change that today and keep you updated.

 

Hey did you ever find out the issue? I’ve recently got similar misfire codes but all of bank 1, P0301 P0303 and P0305. Wondering if the new A/F sensor fixed your problem.