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Hi yall...

My brother has a 99 civic LX-- the CEL was on and the code pulled was a bad O2 sensor. I was changing out the sensor and saw that the manifold (header) was cracked-- I"m thinking that this may have something to do w/ the faulty 02 sensor readings. I'm thinking that I should replace the manifold first before I replace the sensor, just to make sure I'm fixing the problem and not the symptom.

A couple of questions:

1. Is that manifold welded onto the cat? It looked like it was from my short exam of it.

2. I found a place that well sell me an aftermarket OEM equivalent (both mani and cat) -- I don't think it CARB exempt (i'm in California)-- for about $275. I think that's a pretty good price. However, the results I'm pulling up online give me non-carb exempt combos for roughly the same price, and the CARB certified ones are about $500+. Will it make a difference? I want to make sure it passes SMOG.

Any ideas?

thanks in advance for your help!

 
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bump

anyone?

 
Rep Power: 290

sure. per majestic's parts catalog, the manifold and cat are one piece, ie. welded together, so you'll likely have to replace both. the cost for the oem part is 437.82. i'm not from CA, so i can't be sure of smog policies, but i suspect that cracked header would have to be replaced for it to pass. i could see this causing an o2 sensor code to be thrown. however, the sensor is obviously the cheaper of the two possiblities, so it's your call if you want to try that first. as far as carb exempt vs. non, that's one thing i don't fully understand, as NY doesn't concern themselves with it. my suspicion would be that some shops may pass it anyway, while others would choose to be **** and fail you. you might try asking your friends, or post something up in the CA regional forum. good luck.