jaccord95

I got a 2000 Civic Si
ive been getting the P0420 cel almost daily
i reset it and i might get a couple days without it
wonderin which o2 sensor it is
and also where is the connector for the second o2 sensor, the on after the cat, i followed the wires up to the bottom of the car but cant seem to see the connector.

TexasGlock23

IIRC that is the sensor on the cat. Bank 1

A code P0420 may mean that one or more of the following has happened:

Leaded fuel was used where unleaded was called for
An oxygen sensor is not reading (functioning) properly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
Retarded spark timing
The oxygen sensors in front and behind the converter are reporting too similar of readings

http://www.obd-codes.com/p0420

TexasGlock23

http://autorepair.about.com/library/faqs/bl246i.htm

jaccord95

so where is the connector?

SmokeCRX

Wires run up through the floor from what I remember on those. If you follow the wires up to a rubber body plug stick a screwdriver in and pry it out. On some the connector will just pull out after this. On others u have to go inside the car and under the seat/carpet u will find the connector. If your gettin a 420 code...chances are pretty good your converter is bad. Unless you are gettin a code for the 02sensor also...at which point I would replace the sensor and drive and see if the light comes back. If it does...pull out your wallet. lol. Good luck buddy.

jaccord95

i tryed to find that and if its inside does anyone know exactly where at?

willie

code 420 is either an o2 or a cat one or the other unless you have a broken wire it should be catalyst inefficent code right?

SmokeCRX

forget the 02 sensor...it prob needs a cat