P0430 Nissan -will adding fuel injector cleaner temporarily cause p0420 and p0430m

Question

I was having problems with p0171 and added fuelinjector cleaner. this didn't help. I then changed the maf sensor andit fixed p0171, but now I have the p0430 & p0420. no other codes or drivability problems. Will adding fuel injector cleaner cause these two codes that I did not have before.

Answer 1

HI there,

It is very possible the injector cleaner could cause these codes. The system may not have enough O2 in it while this is running through it and that could case the rear O2 sensor to read wrong. I would clear these codes then drive the car a while. If the same codes return, then it's quite possible you will have to replace the converters.