Today my check engine light came on. I have a 2001 camry 4 cyl engine auto
tranny. I run the code reader and i get code
P0420. code P0420 means Catalyst system Efficiency below Threshold (bank 1). what exactly does this means. also i live in the noetheast we just got hit with heavy snow. could all the slush being kick up into the car cause this problem? thank you for any help.
The answer to your question is simple. You didn't say how many miles you
have on the vehilce. But that doesn't matter. Change the front O2 sensor
[oxygen]. They go for around $49.99--$99.00.
Don't forget to reset the "check engine" light.
dude if you want you can go to howstuffworks.com. Its the best site to learn about anything and it even has stuff on the catalystc system
If you ever have that code come up after youve replaced both o2 sensors dont go around replacing the converter because emissions warranty will cover that usually 8 years 80k miles