Erease code over and over again - Toyota Nation Forum : Toyota Car and Truck Forums
Corolla 8th Generation (1998-2002) Specific discussion of the 8th generation

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post #1 of 10 Old 05-22-2019, 12:07 PM Thread Starter
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Erease code over and over again

Hello All,


I just want to ask if any of you have one of this "check engine" codes and in order to "turn off" the light have you use a scan tool and erase it every time comes on?
That's my story: 2001 Corolla, love it but like a year ago came with the well known P0420 DTC, so I changed the catalytic converter BUT I made the mistake to put an aftermarket one. It works fine for like 6 months , but then eventually light came back. At first, after continue driving the car and change to a next Gasoline level (mechanic recommend that) incredibly the light went off, but again, after a month or so, light back, so I bought a scan and since then, every time light comes on I erase the code with the scan . As a note always the same code comes on, but my question (maybe a silly one) is if this frequent "erasing" of this same code can create any problem on my car? I personally don't think so, but like to ask people with more experience. Thank you in advance for your feedback!

Last edited by Pedro13; 05-22-2019 at 12:22 PM. Reason: Mistake
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post #2 of 10 Old 05-22-2019, 12:15 PM
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Short awnser no. Things to consider check the condition of your pipes. Look for holes or noise these can cause that code. Aftermarket o2 sensors will cause loads of issues so ensure they are denso (ngk). A good scan tool can check the status of your o2 sensor it's the rear post cat that trips p0420 so ensure it's working. If everything checks out then Google non fouler and do it.

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post #3 of 10 Old 05-22-2019, 12:28 PM
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Yup, faulty O2 sensors can trigger p0420. Make sure it's not the cat:

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post #4 of 10 Old 05-22-2019, 01:16 PM
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I donít have a cat on my 1998 Corolla and every time my check engine light comes on I just erase it. It only every throws code P0420. I havenít had any issue and Iíve been doing this since I got it straight piped in December.


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post #5 of 10 Old 05-22-2019, 01:23 PM
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Well being catless will definitely cause p0420.
You may have just had a faulty upstream o2 sensor and killed two cats with it. You need to ensure proper operation of the upstream o2 sensor.
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post #6 of 10 Old 05-22-2019, 01:45 PM
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For the cost ($5), I'd throw a spark plug nonfouler on the post-cat O2 sensor, unless you live in Cali or some other commie region. Doing this eliminated my recurring P0420. The action of clearing the code constantly in itself won't harm anything.
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post #7 of 10 Old 05-22-2019, 04:32 PM
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Quote:
Originally Posted by topguncam3888 View Post
For the cost ($5), I'd throw a spark plug nonfouler on the post-cat O2 sensor, unless you live in Cali or some other commie region. Doing this eliminated my recurring P0420. The action of clearing the code constantly in itself won't harm anything.
You should always make sure your upstream o2 sensor is okay before doing the defouler mod. Otherwise you'll run rich all the time, have low MPG, and can kill the cat.
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post #8 of 10 Old 05-22-2019, 05:55 PM
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Quote:
Originally Posted by doctorbee View Post
You should always make sure your upstream o2 sensor is okay before doing the defouler mod. Otherwise you'll run rich all the time, have low MPG, and can kill the cat.
If the upstream was bad wouldn't you be doing that anyways?
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post #9 of 10 Old 05-23-2019, 12:12 PM Thread Starter
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Thank you all for your good comments and suggestions. I forgot on my original mail mention that I changed the O2 sensor too!, but again, using an aftermarket one... My MPG is very good, in fact is one of the reasons I love this car!. I personally don't think car is running rich.


Based in all this facts, I will go to install the non-fouler and put this issue on bed... Thank you all again for your help!
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post #10 of 10 Old 05-24-2019, 09:27 PM
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Look up what you installed. If it is not a denso or ngk o2 sensor it WILL cause further issues. Just search Bosch on this forum and read countless posts about it from dozens of different owners.

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