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Old 08-16-2014, 01:40 PM   #1
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Uh, maybe it IS the O2 sensor...

Thought I'd swap over my O2 sensors to check if there was a problem with one. Pulled off first post cat. Hmm, think I found the problem. 😏

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Old 08-16-2014, 08:18 PM   #2
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wow looks like the shield was burned/melted right off.

What symptoms were you seeing? O2 codes? Rough running?

I think I need to pull mine and check that as well.
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Old 08-17-2014, 04:30 AM   #3
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Actually, it ran just fine. Had a CEL and the code was a p0430, which signals a bad cat ( or maybe a sensor that is toast). Also the Durametric readings for pre and post cat were both in roller coaster mode.
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Old 08-17-2014, 08:39 AM   #4
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How many miles on this O2 sensor?
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Old 08-17-2014, 08:45 AM   #5
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Don't know really. The car has 85k miles on it but I've only had it for a year or so. The O2 on bank 1 is clean.
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Old 08-17-2014, 12:57 PM   #6
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Congrat's! Its always nice to find the exact cause of the problem on the first try!

I usually employ the "replaced-345-parts-and-its-still-not-fixed" approach.
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Old 08-17-2014, 04:23 PM   #7
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Congrat's! Its always nice to find the exact cause of the problem on the first try!

I usually employ the "replaced-345-parts-and-its-still-not-fixed" approach.
Too funny. Sounds like someone I know!
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Old 08-18-2014, 06:07 AM   #8
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Yep, sometimes they do get fouled. Now for the next big question: Why did that bank get so fouled with oil??
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Old 08-18-2014, 08:39 AM   #9
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Actually, it is not really fouled with oil. The outer shell is broken/corroded/missing and is coated with carbon deposits. The inner sensor is faking off as well. Could be the result of the massive air leak due to a broken oil filler tube and the resulting backfiring and other small explosions that I heard. All fixed now. We'll see...
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Old 08-18-2014, 08:44 AM   #10
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Actually, it is not really fouled with oil. The outer shell is broken/corroded/missing and is coated with carbon deposits. The inner sensor is faking off as well. Could be the result of the massive air leak due to a broken oil filler tube and the resulting backfiring and other small explosions that I heard. All fixed now. We'll see...
Those heavy carbon deposits look like excess burned oil in the exhaust to me... but I could be wrong.
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Old 08-18-2014, 08:51 AM   #11
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Actually, it ran just fine. Had a CEL and the code was a p0430, which signals a bad cat ( or maybe a sensor that is toast). Also the Durametric readings for pre and post cat were both in roller coaster mode.
Is that a oem or Bosche O2 ?
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Old 08-18-2014, 08:53 AM   #12
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Congrat's! Its always nice to find the exact cause of the problem on the first try!

I usually employ the "replaced-345-parts-and-its-still-not-fixed" approach.
Not to mention a guaranteed performance improvement for your money spent!
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Old 08-20-2014, 08:45 AM   #13
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Those heavy carbon deposits look like excess burned oil in the exhaust to me... but I could be wrong.
Yes, you are probably right. I have replaced the sensor but the readings still indicate a cat problem. Marbe I'll try a smoke test on the exhaust to check for leaks. I changed the AOS in the spring and the MAF is fairly new as well. Hopefully it's not really the cat. Major $ !
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Old 08-20-2014, 09:10 AM   #14
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If you end up needing a cat or cats I happen to know a guy that has both cats from my donor engine
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Old 08-20-2014, 02:07 PM   #15
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Hopefully I won't need them ( it ). All 4 cats ?


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Old 08-20-2014, 03:40 PM   #16
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Yes, you are probably right. I have replaced the sensor but the readings still indicate a cat problem. Marbe I'll try a smoke test on the exhaust to check for leaks. I changed the AOS in the spring and the MAF is fairly new as well. Hopefully it's not really the cat. Major $ !
Maybe pull and compare spark plugs on both banks. If one side is heavily carboned, you know there is oil in the combustion chamber.
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Old 09-20-2014, 06:01 PM   #17
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so I bought a used cat on eBay for 120 bucks. Install no sweat. Running for a week and no codes yet. Probably too early to tell (touch wood) but my SAI codes haven't come back either. Wouldn't that be lovely!
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Old 09-21-2014, 07:16 PM   #18
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so I bought a used cat on eBay for 120 bucks. Install no sweat. Running for a week and no codes yet. Probably too early to tell (touch wood) but my SAI codes haven't come back either. Wouldn't that be lovely!
Congrats

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