Repairs for diagnostic code P0420

Hey, Dave,

I had the same problem, and I was told that once I replace the sensor and check that there are no obstructions in the exhaust tube -- if it's the front and something did get in there, you have bigger problems -

- all should be good. I changed the sensor myself, saved a wad o' cash, and i am even getting better gas mileage.

Good luck, Z

How do I check if there's something in the exhaust tube? Can I just take it off and look in it? Or is there a better way? Thanks, Dave

I took mine off...it wasn't that difficult, but it's not something I'd want to do on a cold windy day . Chances are there's nothing in there...it would be awful hard for something to get stuck in there, I think,

k,- Hide quoted text -

I also had the same Diag. code come up on my 2001 Maxima 0420. Of course dealer wanted to replace front pre-cat tube and both front sensors for a whopping $2400 total bill with labor.

1 can of electrical contact cleaner took care of the problem if you can beleive this one. I am still planning on changing the O2 sensors up front just to safe. I had to get the car through vechile inspection and the cleaner worked.

John

ink,- Hide quoted text -

What did you do with the can of contact cleaner to fix the problem? Dave

think,- Hide quoted text -

Dave, You clean the plug in fittings on the end of your O2 sensor. Look to see that there is a tight fit and that there is no corrosion interfering with the contact. If so you need to get that cleaned out or fitting tight.

John