I have a 2000 Honda Accord V6 sedan (under 100k miles). For two years currently I have had a check engine light.

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Originally i was called it was a CO sensor the was broke.But currently when I get the auto inspected, the inspector states I have actually a catalytic error.

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

Check engine irradiate comes ago on the following day after all the money spent. Ago to the mechanic. That says currently that the intakes into the catalytic system there are all clogged, therefore that requirements to it is in scrubbed.

Many hundreds dollars later, and the difficulty persists. Still a check engine light.

Has any kind of else proficient a similar issue? go anyone have a proviso what can be causing this examine engine irradiate nightmare? ns cannot gain the vehicle inspected so I have actually that included head ache.

Thank friend much.


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

Take the automobile to Autozone and also have the password read. They will do this for free (unless you in California, in which situation take it come the dealership or an independent mechanic that is not the mechanic you’ve been acquisition it to, and also pay for a diagnostic). Make sure you gain the actual password (it will be a 5-digit alphanumeric code such as P0100), no the clerk’s interpretation of the codes, and also post them here.


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

It might be a negative O2 sensor. The specific code would carry out a clue.

Also Google “How to pass a smog test”, there are some an excellent informative web links there on this topic.


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

Have you gone to the dealer ? There are a couple of instances where the sometimes higher rates of the dealership are offset by actually solving the problem.


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

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

Car inspections below in Houston room not the kind you can just easy obtain past like they supplied to be due to our area-wide high pollution.My following step, if I might not uncover a solution, to be to just take it come a dealer. Yet I invested so lot money currently that things are getting aggravating.


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

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


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

When my vehicle had that password failure, ns did a most googling. And, a many mechanics said in most instances 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 on the output. As soon as the automobile is cold, the convertor can not work. As soon as it is hot, the computer system expects the entry to have actually crud, and the output to be shed clean. Thus, there will certainly be a difference in between the two sensors.

If the cat is bad, there will be no difference. If the calculation sensor is bad, it might not display a difference. If the entry sensor is bad, it might not display a difference.

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

I bought a scanner which supplies sensor data. I obtained an EQUUS 3140, much more than friend need, because I live in Mexico whereby there space beau coup old cars, and also the 3140 will review OBDI on part makes. If friend hook up and also note the typical readings once the car is working, you will have a much better idea if this falls short later.


It might be the sensors, yet on newer cars the software can usually phone call if the sensor isn’t working. Mine guess through that password it is the cat that has actually failed. Or is failing. The cause of the failure could be miscellaneous wrong with the engine that course. Yet it i will not ~ be that surprising that a cat would certainly fail at approximately 100K.

I assumption: v what I’d do is carry all the regime engine maintanence recommended by Honda up to date, and also if that didn’t fix it, I’d change the cat and probably both sensors (before and after the cat) at the very same time. That should obtain you with the smog test with flying colors.

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If you desire to shot to settle it ~ above the cheap, simply replace the sensors. There’s opportunity – slim possibly – that will be great enough to happen the smog test.