Question about 2004 Honda Accord
I have a 2005 Honda Accord EX w/ about 53K miles. I got the battery replaced, got an oil change, replaced the air filter and the cabin air filter (all w/ in 2 days).
I then drove it for 200 miles, filled up the tank full and the emissions light started blinking. I pulled over, inspected, and then drove off and the light went out. About the same thing happend again 2 days later, but this time the light stayed on.
Ideas of what this could be?
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Posted on Jan 02, 2017
SOURCE: Code P0420
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
There is one 02 sensor in front of the catalytic converter (called upstream), and one behind it (downstream). When the engine is warmed up and running normally the upstream oxygen sensor reading fluctuates and the downstream one is fairly steady. In the case where both readings are fairly steady, a P0420 check engine light code is set.
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter
Posted on Mar 24, 2009
If you brought your car to Honda for service, they probably forgot to reset the maintenance reminder. If you took it to another shop, they probably did not know how to reset it. Anyway, the reset procedure is:
Put your key in the ignition
Turn the key to the II position for a couple of seconds
Then turn the key to the off position
Now push and hold in the odometer reset button
While still holding the odometer reset button, turn the key back to the II position
Hold for I think 10 seconds or so and your maintenance reminder light should reset it self.
Posted on Jun 20, 2008
The EGR will not cause this issue, this sounds like the Catalytic Converter was not hot enough, another trick that worked for this kind of fail was a fresh oil change, make sure the engine is up to normal operating temp, which would be just short of 1/2 scale on the temp guage, if it runs cold replace the thermostat, I did smog tests for 30 years and these are the things I did to get cars like yours to pass given the test results you gave for the tailpipe.
Posted on Dec 05, 2008
SOURCE: won't pass due to emissions
O2 senser usually fail.
anything else fail??? did the inspectionstation tell you what need to be done to pass.??
do you have the print out of the inspection????
any machanic should be able to fix what ever the problem is.
Posted on Oct 10, 2008
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