Hey there, new to the forum and apologize if this has been asked before, but I've looked all over the place to no avail.
I recently got an error code of P0421: warmup catalyst efficiency below normal (bank 1)
I'm pretty sure the problem is my catalytic converter and my question is could I remove the cat and just run piping instead without having to update the computer? Or would it be cheaper to simply replace the thing?
No emissions testing where I live so don't have to worry about that. I have already replaced the upstream 02 sensor, but the car is still bogging down and hesitating off the line noticeably. Any advice would be great, thank you.
Post general questions and information about the 8G Galant here. Ask for troubleshooting help here.
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- Posts: 1
- Joined: Wed Aug 10, 2016 5:20 pm
- Year/Make/Model: 03 Mitsubishi galant
- Engine: 2.4 4cyl
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