Hi all I’m getting a code p0300 on my 2014 IS 250 I changed out plugs and coils and 1st bank O2 sensor what are the odds that every O2 sensor is no good I don’t know what to do next …Any help would be appreciated..Ty

 

Did you replace everything with the OEM?

Check all vacuum hoses for leaks. A smoke test is probably one of the best tools to detect for any vacuum leaks. Has the throttle body and MAF been cleaned?

Please upload all vehicle live data and the freeze frame (important). Maybe I could help!