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Check engine light and code P0135

Tiny
JPEREZ489
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Thank you so much! I really do appreciate it! I’ll continue to drive it and monitor it. I really cannot thank you enough for your help.

It was much easier before eh? Hahaha

Thank you again! I’ll keep you updated! Take care and stay safe.
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Saturday, March 13th, 2021 AT 11:32 PM
Tiny
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You are very welcome. I will watch for your reply.

Joe
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Sunday, March 14th, 2021 AT 6:49 PM
Tiny
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Hello Joe,

I found a “steps to take” style webpage yesterday and decided to try it. It told me about how exactly to run the car from turn on to turn off and between the drive to complete a drive cycle for my Honda. After the drive I decided to check if all the sensors were ready by using the check engine light in the on position I had found a video saying that if you put the car into the on position and after 20 seconds, if the check engine light turns off completely all sensors are ready, if a sensor isn’t ready after 20 seconds the check engine light will flash 5 times then turn off. Yesterday it flashed 5 times confirming not ready. Today it didn’t flash after 20 seconds it went completely off. After that I plugged in my obd2 scanner to double check this time, and the scanner confirmed everything was green and ready to go. Should I take it in to get re-smogged tomorrow? And also should run my scanner again prior to the test to make sure?
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Sunday, March 14th, 2021 AT 8:52 PM
Tiny
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Hi,

If the light is off and everything is reset, get it checked as soon as possible. You shouldn't have to scan it again unless the check engine light turns back on. Don't disconnect the battery or clear any codes. You'll have to start over again. LOL

Let me know.

Joe
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Monday, March 15th, 2021 AT 11:38 AM
Tiny
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Hello Joe! Great news my car has now passed smog, runs great, and all I’m doing now is waiting for my new registration to arrive! Thank you so much! I really appreciate your help! It really helped so much and thanks to your advice my car is working well and passed all it’s tests! Thank you!
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Thursday, March 25th, 2021 AT 11:05 AM
Tiny
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Hi,

That's great news. I'm glad to hear it. Please feel free to come back anytime in the future if you have questions. You are always welcome here.

Take care,

Joe
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Thursday, March 25th, 2021 AT 5:33 PM
Tiny
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Thank you much appreciated! Will definitely come back if I need any help or have any questions. Stay safe and Take care!
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Thursday, March 25th, 2021 AT 8:16 PM
Tiny
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Hello Joe! Hope you’ve been well. I have a concerning check engine light that popped back up. I had received a P0420 code before my previous P0135 code. When I had taken my car to get fixed for the catalytic converter it fixed the P0420 code it was no longer in the permanent codes. Then after I had received the P0135 code. After that's when I fixed the O2 sensor problem as I thought that was something I could do since it's nothing big. Now after the car had received a new catalytic converter now it flashed the P0420 code again. And it has only been in there for about a month or two. What's worrying me is that the cat was good, I passed smog and had no lights last time I posted on here, so what is causing this? I don’t to have to keep taking my car in for fixes especially not if I have to take it into Honda where they charge an arm and a leg.
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Saturday, April 17th, 2021 AT 4:20 PM
Tiny
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Hi,

That is odd. Do you know if the new converter is an OEM converter? Also, all "new" converters carry an extended warranty, so if it is bad again, it should be covered under warranty.

Is the P0420 the only code? Also, you said the light was flashing. If that is the case, that is usually an indicator of a cylinder misfire. If raw fuel is entering the new converter because it isn't being burned, it will damage the converter.

Let me know.

Joe
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Saturday, April 17th, 2021 AT 7:45 PM
Tiny
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Hello!

The P0420 code is the only code given off and I apologize for the confusion by flashing I meant It turned on, it didn’t flash off and on.

I don’t know if it is OEM to be honest but I know it is CARB compliant. So I should be able to have a new one sent?
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Saturday, April 17th, 2021 AT 7:59 PM
Tiny
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Hi,

I can tell you a new "aftermarket" catalytic converter is required to meet EPA emissions standards for 25,000 miles. Have you contacted the people that installed it? I would hope they would stand behind it.

Also, the 25,000 miles is a requirement by the EPA. That isn't something that the manufacturer can change. I doubt you put 25K miles on it in a couple of months. LOL

Here is the only issue I can think you may have. The vehicle has a warm-up catalytic converter in the exhaust manifold and then another converter under the vehicle. See pic 1

If the same one has failed again, we need to check a few other things. For example, high fuel pressure can cause a rich fuel mixture. That can damage a converter. Also, even an engine coolant temp sensor can cause issues because it indirectly controls the air-fuel mixture.

I don't know if you have any interest, but the remaining pics below are the directions for the removal and replacement of the converters. I figured I would add them in the event you want to do it yourself.

Let me know if I can help.

Joe

See pics below.
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Saturday, April 17th, 2021 AT 9:54 PM
Tiny
JPEREZ489
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I will definitely have to get in contact with them because I really don’t understand how everything could be perfect to the point that everything went well and even the car read everything working fine and no codes. Even passed smog but then about a month and two months later it resurface that makes no sense to me for it to happen that fast. It was specifically the warm up one that was changed. How would I be able to test if there’s a high fuel ratio mixture?
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Sunday, April 18th, 2021 AT 12:42 AM
Tiny
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Hi,

To check the fuel issues, you need a live data scan tool. Once it is plugged in and the vehicle is running, you can tell how rich or lean the engine is running based on what is called short-term and long-term fuel trims. Specifically, short-term fuel trims.

If you have a live data scan tool, let me know what the fuel trims are.

Joe
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Sunday, April 18th, 2021 AT 5:13 PM
Tiny
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Hello Joe, I took this live reading after my car was at operating temperature and drove a couple of miles.
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Monday, April 19th, 2021 AT 12:54 PM
Tiny
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The fuel trims look okay. They can be plus or minus approximately 10%. In a perfect world, they would stay at 0%.

Below I attached the diagnostics for the code. Take a look through it and let me know if it is something you feel comfortable doing.

Let me know.

Joe
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Monday, April 19th, 2021 AT 5:23 PM
Tiny
JPEREZ489
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Hello Jacobandnickolas! I ran the check and both the regular DTC P0420 code and the permanent P0420 code are gone! I’m not sure how haha! Did the car fix itself? LOL
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Thursday, April 29th, 2021 AT 3:48 PM
Tiny
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Hi,

LOL, maybe you hit something that wasn't making a good connection. Regardless, this is good news.

Let me know if things change or if you have other questions. Also, feel free to come back anytime in the future that you have questions. You're always welcome here.

Take care,

Joe
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Thursday, April 29th, 2021 AT 8:56 PM
Tiny
JPEREZ489
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Thank you! I Really appreciate it!

I actually do have another question thats been driving me crazy, my tpms light, VSA light, and SRS light are on and I don’t know why. It’s been like that since I’ve had the car. Everytime I try to reset the tpms/calibrate it, it never does. The tpms just comes back. When I took it to american tire depot they said they didn’t know why it was on and that the wheels didn’t have tpms monitors in within them that my honda has it within the body. How would I fix this problem? Not sure how to approach it
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Thursday, April 29th, 2021 AT 9:10 PM
Tiny
JACOBANDNICKOLAS
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Hi,

It could be a few things. What I need you to do is start a new thread related to this problem. We try to keep the links specific to one topic so they are more helpful to others. I hope you understand.

Here is the link to start a new post. Simply copy and paste your new question and we'll get on it for you.

https://www.2carpros.com/questions/new

I will watch for the new post, and again, I hope you understand.

Take care,

Joe
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Thursday, April 29th, 2021 AT 9:13 PM
Tiny
JPEREZ489
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Definitely understand. Thank you!
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Thursday, April 29th, 2021 AT 9:50 PM

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