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Ok, I got the new 02 sensor in the mail and installed it (I got NGK as I did some research and that's who Honda uses). Some more strange behaviour resulted however that I'm trying to wrap my head around. I've been reading up on fuel trims (Short term and long term), and how and why they do what...

I see, that makes sense. I just took my car out for a drive with my OBDII connected to my laptop to get some readings, and a P0133 was triggered which is a malfunctioning upstream 02 sensor so I'm definitely going to replace that. But I also want to be sure it's not something else too. That is...

Is there a way to test the MAP sensor before i replace it? With a multimeter or anything like that? I have an OBD-II to USB cable and some software to get readings from my car computer. Anything in particular I should look for to isolate it? It could easily cost 1,000$ replacing all those parts...

Ok I will definitely replace the air filter, and I'll check out the air if that could be a problem. I just don't see why those things wouldn't have made the CO higher when my cat was shitty, or maybe I just don't understand the way it works properly. Sorry, I would have answered you before but...

Oh he's dumped. Air filter was replaced about 10,000 miles ago. Upper limit on those is 25,000 right? I didn't think it would make that big of a jump on the CO, but I will definitely replace it if you think it will help though.

Sorry, I should have been more clear. The "Pre Cat" smog picture is my smog failure before I replaced my catalytic converter where my CO was fine but my NOx was outrageous (Measured 544, MAX allowed is 487). Post Cat picture is my smog fail with a brand new catalytic converter only now my NOx is...

There was a "hidden" code of a P0420. I say hidden because it didn't have a check engine light, but if you plug it into a OBD-II reader it would show. That code is the reason he recommended I get the new downstream 02 sensor.

Hello all, I'd like to thank you all in advance for any help or advice you're willing to give. I drive a '97 Honda Civic DX with 180,000 miles on it, and I've owned it for 6 years now. I have a long history of smog failure with this car (Even using up my once per vehicle waiver from the state)...

Ok, thank you for your advice. I think I'll take it. But, in California, I bought one of those aftermarket cats, and it performed worse than my 20 year old stock one (replaced it myself) , so I'm pretty sure I have to get the 700$ one from Honda.

Hello all, I have a 97 Honda Civic DX 5 speed manual transmission. First thing this morning I took it to get smogged (Drove it 20 minutes freeway first) knowing I have a bad Catalytic converter, and knowing I would most likely fail, but no check engine light so I tried anyways, and failed by...