I have a 2000 Honda Accord V6 sedan (under 100k miles). For 2 years now I have had a inspect engine light.

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Originally i was said it to be a CO sensor the was broke.But currently when I gain the vehicle inspected, the inspector claims I have actually a catalytic error.

So turn off to the mechanic. They change the catalytic converter, claiming that was simply an north shell.

Check engine irradiate comes ago on the following day after ~ all the money spent. Ago to the mechanic. He says now that the intakes right into the catalytic system there room all clogged, so that needs to be scrubbed.

Many hundreds dollars later, and also the difficulty persists. Quiet a examine engine light.

Has any else knowledgeable a comparable issue? go anyone have a clue what could be resulting in this check engine irradiate nightmare? i cannot gain the vehicle inspected for this reason I have actually that added head ache.

Thank you much.


shadowfax November 6, 2012, 1:14am #2

Take the vehicle to Autozone and have the codes read. They will do this for totally free (unless you’re in California, in which case take it to the dealership or an elevation mechanic who is not the mechanic did you do it been acquisition it to, and also pay for a diagnostic). Make sure you get the actual password (it will be a 5-digit alphanumeric password such as P0100), not the clerk’s translate of the codes, and also post them here.


George_San_Jose1 November 6, 2012, 6:42am #3

It could be a bad O2 sensor. The exact code would provide a clue.

Also Google “How to happen a smog test”, there room some great informative links there on this topic.


dagosa November 6, 2012, 5:37pm #4

Have you unable to do to the dealer ? There are a couple of instances where the sometimes higher rates that the dealership are balance out by actually resolving the problem.


white_honda November 6, 2012, 10:15pm #5

The code is P0420.The ‘code definition’ reads: Catalyst System effectiveness Bellow Threshold (bank 1).

Car inspections right here in Houston room not the sort you can just easy gain past prefer they supplied to be as result of our area-wide high pollution.My following step, if I could not uncover a solution, was to just take it come a dealer. But I spent so lot money already that things are acquiring aggravating.


keith November 7, 2012, 5:52am #6

I had actually this password on a Corolla, a new rear O2 sensor resolved it. Regularly this code will appear if there is a leak in the exhaust system before the cat.


irlandes November 8, 2012, 12:01am #7

When my car had that password failure, ns did a lot of googling. And, a many mechanics claimed in most situations it is not the cat itself, yet the sensors.

A review. There is no direct method to check the cat. So, over there is a sensor in ~ the input and one top top the output. Once the automobile is cold, the convertor cannot work. As soon as it is hot, the computer expects the input to have actually crud, and also the output to be burned clean. Thus, there will be a difference in between the 2 sensors.

If the cat is bad, there will certainly be no difference. If the calculation sensor is bad, it might not present a difference. If the intake sensor is bad, it may not show a difference.

It seems many mechanics litter the many expensive component at it. Then, once that doesn’t fix it, sell you the sensors.

I purchase a scanner which provides sensor data. I gained an EQUUS 3140, an ext than you need, due to the fact that I live in Mexico whereby there room beau coup old cars, and also the 3140 will check out OBDI on part makes. If friend hook up and note the common readings as soon as the automobile is working, girlfriend will have a much better idea if this falls short later.


It could be the sensors, but on newer cars the software can usually call if the sensor no working. My guess through that password it is the cat that has failed. Or is failing. The cause of the failure might be miscellaneous wrong v the engine the course. However it i will not ~ be the surprising that a cat would certainly fail at approximately 100K.

I assumption: v what I’d execute is bring all the regimen engine maintanence encourage by Honda approximately date, and also if the didn’t solve it, I’d change the cat and probably both sensors (before and also after the cat) at the exact same time. That should get you through the smog test v flying colors.

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If you want to try to fix it ~ above the cheap, simply replace the sensors. There’s opportunity – slim maybe – that will certainly be good enough to pass the smog test.