Question about 2000 Mitsubishi Eclipse
This Po420 code keeps coming on. its says my effeciancy is low in bank 1 it gave me thinks that could be the problem cat, o2 running condition.
well replaced the cat right when the light came on and it was good for a month than came back on.
than i replaced the o2 sensor and it is still on i dont know what it could be?
if the cat was pluggin you would see this as your going down the road it would not get to top speed .. They act up usually only run 40 top speed.
Posted on Apr 12, 2009
from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
A code P0420 may mean that one or more of the following has happened:
Some suggested steps for troubleshooting a P0420 code include:
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Posted on Aug 20, 2009
SOURCE: I have an '01 Galant
Im pretty sure the bank 2 is talking about by the catalitic converter and since is sensor 1 it should be before the CAT otherwise it should be on the exahust manifold prolly in the back of the engine.
Posted on Sep 19, 2008
Your question was truncated. I see that the bad sensor is on bank 1, but I can not see if it is the upstream (sensor 1) or downstream (sensor 2) sensor. The upstream sensors are mounted in the exhaust manifolds (look sort of like spark plugs) and have wires going to them.
You will need a 7/8" or 22mm wrench to remove the sensor (after disconnecting the wires). If your car has over 70,000 miles I STRONGLY suggest that you replace BOTH upstream sensors. One in each exhaust manifold.
Posted on Dec 23, 2008
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