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2005 Honda Accord - Emissions Light Indicator is On!

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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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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dsacco86
  • 1077 Answers

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.

Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter

Posted on Mar 24, 2009

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  • 25 Answers

SOURCE: 2003 Honda Accord Check Engine / Maintenaice Requeried

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

emissionwiz
  • 76164 Answers

SOURCE: 1992 Honda Accord will not pass emissions inspection

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

  • 1 Answer

SOURCE: how do you change a

found info

Posted on Jul 25, 2008

frcs68
  • 1605 Answers

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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Want to save yourself some money and change the cabin filter on your 2003 and newer Honda Accord? The dealer will charge you up to $120 to perform this simply 5 minute or less repair which should be done every 30,000 miles at the same time you change the engine air filter. It will cost you nothing more than the price of the cabin filter. Go to any local Auto Repair store in your area and purchase a cabin filter for your Accord. I recommend Purolator or Wix filters as they are quality made. The filter is located behind the glove box and unlike some older Honda Accords is very easy to access and no tools are required to accomplish this repair. Simply watch this video I made and you will know exactly how to accomplish this maintenance.



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Engine light came on for the first time on my 2007 Honda Accord 2.4 Liter engine. Oil is a little dirty @ 50% - not quite ready to change and the level seems fine. The engine has no unusual sounds or...


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With the headlight OFF push and hold the trip/reset button or stick (located in front of the gauge below the MPH speedo) , turn the ignition switch ON (II), and continue to hold the button for more than 40 seconds. If you did it right the light should go out.

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