The Nissan Path

Hi all I have a 2005 pathfinder its showing bank 1 p0420. I was wondering what a good after market o2 sensor would be? And also if that doesn't fix it what is a good after market catalytic converter?
Thanks

The consensus here is the following:

1. NGK is the only O2 sensor worth spending money on. This is the factory part for the pathy.

2. P0420/P0430 codes can be caused by the secondary O2 sensor, but often are caused by a bad catalytic converter. Try to get a readout of the O2 sensor readings to see if it may be an intermittent issue (jumps all over the place) vs a steady state (probably the catalytic converter).

The pathfinder has less than 80,000 on it will this be under warranty or is there a time limit?

if on warranty take it in.

Generally emissions stuff (catalytic converters) is covered for 8yr/80k miles. A 2005 would be outside of that.

If you have a dealership warranty on it, and there is no deductible, I'd go that route first.

8 years/80k. So, not good even if the mileage was.


Luckily I got my manifold replaced recently under that warranty.

So how about the after market catalytic convertes? Any good ones that you guys have tried?

Not for this particular application, but for a similar engine (VQ35), Walker & Bosal seem like safe choices at a reasonable price.

^^^I agree^^^ I prefer Bosal over Walker because I've had some fitment issues with Walkers on some other vehicles. NTK on the O2 sensors, but Denso, which is owned by Toyota, is also very good. I usually get the best price from Rockauto.com for O2 sensors. One note, if your state follows California emission standards (I know NY state is one of them), then most aftermarket catalytic converters will fail your state's emissions inspection unless they are "CARB certified."