Ok, well engine light came on, and so I went and got the codes pulled. This is all that came up.

P0420

Definition:
Catalyst efficiency Low-Bank 1
Explanation:
The oxygen sensos monitor the catalytic converters ability to store oxygen
Probable Causes:
1. - Catalytic Converter defective (Failure possibly due to #2, 3 or 4
2. - Engine Misfire or running condition
3. - Large Vacuum leak
4. - Engin oil leakage into exhaust-valve guide seals, piston rings

The PCM has determined that the catalyst system efficiency for bank 1 is below threshold for the current engine operating conditions. (Bank 1 identifies the location of cylinder #1, while bank 2 identified the cylinders on the opposite bank)

Im kinda assuming its a bad or 2 bad O2 sensors, but I could be wrong.... Anyone else have any ideas, im hoping its has nothing to do with anything internal. Neeeed Help. Gotta get car inspecting and im trying to avoid a shop if necessary.

 

BTW, the cat has less then 3k miles on it so I dunno if the cats bad already, I did install a new header the same time I got a new cat, and a new exhaust system (cat-back) about >1k miles ago. SO im not sure if the cats bad... AnYoNe?

 

Bad o2 sensor fo sho

 

Now, to find out which is which... any word on if both o2's are exactly the same type? or is the front one different from the one on the cat?

 

I was throwing that code when I got my car...

Then again, I didnt have a cat on the car...

So I got an O2 simulator from here: www.o2sim.com

Back then it was only $25...

Put it on and no more code...


There is also this one thing that you can get from someone on here and ebay. it pulls the sensor away from the exhaust.. Its only a few $ and I heard it works...

 

I hear ya man, but this is effecting how my car drives kinda, like it idels rough, and gas milage sucks right now im sure. But yall believe it is a O2 sensor? Im just tryna find out which one.

 

Anyone else?

 

hmmm i been having the CEL for about 8 months now and i still get 360 miles per tank. it sounds like its the back O2 sensor.

 

bank one o2 sensor is the one attatched to the header. the one in the cat is bank 2.

 

Wilp ftw, where the hell you been bro?

 

moved to england (air force), and working alot. but im still pimpin the tl-s.