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Discussion Starter #1
Trying to figure out where to start on this one. I hear a rattle under the vehicle but I'm not sure if it's the shields or the cat. I dont know much about emissions diagnostics. Where do I start?
 

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Judging from the variety of codes, it might be just a sensor that went bad. But it could be a cat as well. Rather than guessing, I would pay for diagnostics and have it verified before proceeding with replacing anything.
 

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Discussion Starter #5
So which o2 sensor should I replace based on the codes? Is sensor 1 the closest or furthest away from the front of the vehicle?
 

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@Andrewhicks00
RE: 07 mdx, p0430, p0420, p0138, p0139
I'll tell you exactly where to START!


Replace the REAR Heated Oxygen Sensor Bank 1 usually takes care of the problem codes p0138, p0139.
https://www.engine-codes.com/p0138_acura.html

https://www.engine-codes.com/p0139_acura.html


After that, see if you need a new catalytic converter. After replacing the O2 sensor, it's possible that your other error codes MIGHT stop.
For further reading:
https://www.engine-codes.com/p0430_acura.html
https://www.autocodes.com/p0420_acura.html


Good luck!
All the best,
AcuraMDX.MN
 

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@AcuraAddicted Hey Bogdan! I'm a fan. Great videos. Thanks for posting them!


For those that haven't seen the Acura Addicted videos on YouTube, check them out today! I subscribed, I hope you do too, and support another Acura fan like us.




All the best,
AcuraMDX.MN
 

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Discussion Starter #9
Also I think I should state something else here.

The vehicle came from up north, so there was quite a bit of rust when I bought it.

The rear cat connects to the last section of the exhaust via studs and nuts. The studs are nubs now and there are no nuts anymore, which is causing a bad exhaust leak. However since this is at the end connection, after the cat, would it still cause this code?
 

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any exhaust leak will affect you o2 readings, it will be in your best interest to get them fixed. i soaked the nuts in pb blaster and hammered a smaller socket on there, then used a battery impact to free them, it was ugly, but worked. these particular codes are likely from a bad downstream sensor on the rear bank (1). do not disconnect the neg cable bc your freeze data which set the code will all be erased. if you want to investigate you will need this info. when diagnosing engine problems with multiple codes GENERAL guidelines dictate working your way up from the bottom numerically, so start with the lowest number code.
 

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@AcuraAddicted Hey Bogdan! I'm a fan. Great videos. Thanks for posting them!
Thanks a lot!

Guys, sorry for responding in your thread, I hate offtopic, but I can't yet send PMs, and I hate to leave other people's messages unanswered!

As to the topic, I just wanted to reiterate that rather then poking the sky by replacing one element after another, I would first make sure I have proper diagnostics done to identify what it is exactly that's causing the issue. Yes, it's not free, but so aren't those sensors/cats!
 
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