not to hi-jack this thread but how do you know if the cat is failing?
My brothers 2000 4-runner got the same code p0420.
They said that if the cat isn't functioning properly then it could cause a backfire and burn up a piston.
well unfortunately my parents had to get it done asap. The grage they took it to got the part for cheaper and since it had to be re smoged by a certain date they got it done there. I just hate it when I could have saved them money on labor by doing it all myself.
I apologize if this is a repeat thread but search function wasn't working properly for me.
My dad has a 2000 3.4L 4-runner and it didn't pass smog. I need to know which o2 sensor to replace for Bank 1. I'm pretty sure it's the one before the cat but maybe i'm wrong.
Also Pep Boys wants $640...
so i did a search but didn't find a specific answer.
My dad's 2000 4-runner (V6) had engine light come on and the code retrieved was a P0172. To keep this short they wanted $500 for tune up and i told my dad I would do it for him.
I need to know what kind of spark plugs to replace the old...
