Retailmenot....i use it everytime either that or i use the codes that get sent to my email and i passes on to whoever needs them. As for rockauto i always look there first.

 

P0420 1/1 Catalytic Conv Eff

I found these on www.rockauto.com on your 2000 Durango R/T.

Desno Upstream sensor Part # 2344077 and it is only $26.79
Desno Downstream Sensor Part # 2344078 and it is only $34.79

You will have to get under it and look to see how many you need, but normal is 2 upstream (on the down pipes from each side exhaust manifold), and 1 downstream (after the CAT). These are what I would buy.

 

Ok ya I looked yesterday on rock auto and those were the ones I was looking at.

 

Update: my cel hasn't came back on since I cleared it...I ran Lucas fuel cleaner in my tank a couple more times, haven't changed the o2s yet though

 

Your fighting the inevitable.

 

Lol. I don't think its the cat converter so I'm not too concerned. Waiting on the o2 from rock auto