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Old 02-16-2011, 03:09 PM   #1
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New Car, New Issues

just bought a 1997 honda civic 5 speed VERY cheap, and you'll see why...

it is in great running condition, has cold air, beautiful interior, new clutch, but it has 4 trouble codes: P0141, P0135, P1298, and 0000(?) and a crack on top of the exhaust manifold.

the first 2 are O2 related, the third could be fuse box, the last...no clue. anyway, anyone have a guess if they are related to each other, and/or the manifold crack?

i've researched this, but it seems i may have to take it to a shop in order to retrieve the data stream. thoughts? thanks!

edit: the car's an LX
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Old 02-16-2011, 03:32 PM   #2
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Re: New Car, New Issues

The crack in the exhaust manifold is likely allowing some oxygen from the air to enter the manifold between pulses and this affects the oxygen sensor signal. The erratic signal is likely throwing the code.

It should be pretty inexpensive to replace the manifold with one from a salvage yard though the rusted bolts on the outlet of the manifold may give you some trouble.

I'd replace the manifold before you replace the o2 sensor.
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Old 02-16-2011, 04:55 PM   #3
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Re: New Car, New Issues

thanks E. i'll likely try to patch the leak until i can replace the part. used has me concerned tho because the cat is part of the manifold assembly.
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Old 02-16-2011, 05:42 PM   #4
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Re: New Car, New Issues

If it is like my civic, there is a joint between the two- so you won't have to replace the cat. I had to twist off the bolts between the cat and manifold- unless the cat side is threaded, you can just replace them with cheap bolts and nuts from the hardware store.
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Old 02-18-2011, 07:36 AM   #5
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Re: New Car, New Issues

Nope. If it's the D16Y7 like my DX, the manifold and cat are one piece. Look around for aftermarket parts as OEM will be expensive and have the same flaw. Junkyards will have cracked ones as well. Mine has a crack but it's not horrible (yet).

I heard from someone who did his own swap to be careful with the O2 sensor - easy to break off.
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Old 02-18-2011, 07:48 AM   #6
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Re: New Car, New Issues

Is it impossible to weld?
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Old 02-18-2011, 10:05 AM   #7
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Re: New Car, New Issues

I think they are cast iron, mostly. Not impossible to weld, just not easy. Parts that have wide temperature operating ranges (like exhaust manifolds, woodstoves, etc) tend to have a high tendency to have repeat cracking. It's kind of a crap shoot. Most welders hate welding on it.
Sometimes you get lucky and things are just ducky.
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Old 02-18-2011, 12:58 PM   #8
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Re: New Car, New Issues

thanks guys.

my 1298 code may be a bad ELD, but i can't find one new. may have to search junk yards. the thing is making my speedo move all over the board. i guess the whole fuse box has to bought.
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Old 02-19-2011, 07:55 AM   #9
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Re: New Car, New Issues

Cast Iron is not the easiest thing to weld. It should be just a few (rusty) bolts to replace it.
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Old 02-20-2011, 04:40 PM   #10
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Re: New Car, New Issues

An older civic 92-95 manafold will bolt right up but does not have the cat in it.
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