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Old 01-05-2010, 06:37 AM   #1 (permalink)
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2001 Accent 3door 1.5L
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scottwithakay
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My 01 with a 1.5L has been burning oil through the valve guides for a while now. I have a new problem. The flexible portion of the exhaust tube under the engine has a big hole in it. I am getting the codes P0121, P0128, and P0422. Which of these do you think is due to the exhaust leak and which do you think is due to the burning of oil?

Also, I am short on money right now, so buying the whole exhaust tube assembly is probably out of my budget. I was thinking of cutting it out and splicing in a length of flexible metal tubing. Is there any cause for concern in doing so? Is there a better alternative?

If anyone had a list of codes and their coorisponding possible causes, would you please point me in the right direction?

Thanks! Happy holidays!
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Old 01-05-2010, 12:13 PM   #2 (permalink)
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That P0128 sound sliek an 02 sensor and that would prob. be because of the flex pipe...mine threw the downstream sensor P0129 and went away after i fixed the whole....My mechanic washelpful.teh new flew pipe is liek $75 and you have to fight to get the mounted of rusted bolts off that hold it n....he cut the before and after pipe section and welded in a new flex pipe for $50 labor included.....he said why replace an entire stainless pipe when its just the one section of flex that rusts every few years!
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Old 01-11-2010, 12:13 PM   #3 (permalink)
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I had a code that said it was a O2 sensor.

My problem was a crack in the flange of the flex pipe.

My muffler shop put on a generic flexpipe, total part and labor $125. four years ago.

After that it was fixed. The check engine light stayed off and the O2 senors were fine.

-TommyR
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Old 01-14-2010, 08:12 PM   #4 (permalink)
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There's lots of information on the internet as to the meaning of OBD2 codes, just use your favorite search engine.

Code P0121 relates to the Throttle Position Sensor (TPS) and more info can be found here.

Code P0128 relates to the Thermostat and more info can be found here.


Code P0422 relates to an emission control system leak.

Here is a link that'll give you the common diagnostic codes for OBD2.

Hope this helps.
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Old 04-09-2010, 09:46 AM   #5 (permalink)
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May be a little delayed on the reply - but I just crawled out from under my 01 elantra.. Same issue - check engine light because of a hole in the flex pipe. Been that way for ~8 months, and I finally decided to fix it. The exhaust is in 3 sections.

The bolts at the muffler (back ones) came loose ok, and the front ones at the flex pipe came out ok (relative to rusty bolts/nuts in both cases), but the middle section was rust-fused together [which is why I had to take the muffler section loose]. I used a diamond blade saw to cut the bolts off and got the two pieces apart.

Thankfully - the threaded bolts are part of the flex pipe assembly, so the middle section just has holes and the new flex pipe (~$75 from auto parts store) has the threads. Just need new nuts.. No welding or pipe cutting required! YAY!

Although - the O2 sensor that is also in that section of pipe is a bear to remove, given all the rust..

All in all - not too bad if you have a couple of jack stands and a couple of hours to get it all out, and an auto parts store to sell you the correct part.
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Old 05-04-2010, 07:41 PM   #6 (permalink)
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I am fixing my friends Accent and was wondering what size pipe this is and if anyone replaced it with regular pipe and not flex pipe? I am supposed to take care of this tomorrow for her so any responses would be great. Thank you very much!
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Old 05-04-2010, 07:45 PM   #7 (permalink)
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QUOTE (tuboy19 @ May 4 2010, 07:41 PM)
Quote:
I am fixing my friends Accent and was wondering what size pipe this is and if anyone replaced it with regular pipe and not flex pipe? I am supposed to take care of this tomorrow for her so any responses would be great. Thank you very much!
The flex section needs to be there so engine can rock back-forth and not break pipe over time.
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Old 05-04-2010, 07:52 PM   #8 (permalink)
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QUOTE (sbr711 @ May 4 2010, 07:45 PM)
Quote:
The flex section needs to be there so engine can rock back-forth and not break pipe over time.
Understood, thank you. Any idea what diameter flex pipe would be needed then? I work at an autoparts store and have a friend with an arc welder, our computers just don't give us inclinations as per what size the tubing is. I was searching and it appears many people also got a fix for a slow response for the front 02 from this, so I will hold off from grabbing that for now.
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Old 05-05-2010, 03:30 PM   #9 (permalink)
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QUOTE (tuboy19 @ May 4 2010, 07:52 PM)
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Any idea what diameter flex pipe would be needed then?
[b]Not right off, though a caliper would suffice to measure the pipe' OD[/color]


I work at an autoparts store and have a friend with an arc welder,
[color="#FF0000"][b]You'll want to use MIG or TIG, MIG be easiest to work with,, arc/stick welder will just blow hole(s) in pipe

I was searching and it appears many people also got a fix for a slow response for the front 02 from this
[b]Common result of broken front pipe is leak mess with upstream ox and set MIL, with a P-0133 Ox Slow Response B1S1... Hyundai actually had to issue a TSB as people was relacing sensor, when real fault hinged on the leak
Program update for Ox, specifically P-0130, but I update the PCM anyway.. updates for the 0128 I think, the 0121 has been random TPS, dont see that alot any more.. The 0422 is likely a catalyst efficiency, oil fouling and mis-fire will kill the cat..
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