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Old 11-09-2018, 04:02 PM   #1
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Exclamation Front O2 unaccessible due to -- bent headers?

I brought the car into the shop for a new engine mount and front O2. (CEL for front O2 heater and rear O2 sensor.)

Front O2 was not able to be installed. Mechanic installed it on the rear since that one was also triggering the CEL and then gave me the following info:

- Original Rear O2 sensor wires cut -- being used as a plug now

- Someone drilled a hole in exhaust 6" downstream, which is where the Rear O2 sensor is these days.

- Exhaust strap (?) downstream of cat is now welded closed (welded... to frame? Unsure. He seemed convinced this was not a factory job)

- (Main issue) Front O2 inaccessible - he "tried every tool possible" but there was not enough space between engine block to get a socket on it.

- Claimed entire front exhaust system significantly raised -- "Couldn't fit a screwdriver between heat shield and frame" (I dunno what it's supposed to fit like)

Mechanic's theory: Header/phalange smacked something in the past, bent everything upwards, making front O2 inaccessible.
In combination with the strange welding issue behind cat, he concluded exhaust system would need to be "totally dropped" to access Front O2.

Your help and advice much appreciated here. Obviously Front O2 sensor can't just chill there forever without replacing. But I hate the thought of the labour costs involved for his suggestion.




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Old 11-09-2018, 07:08 PM   #2
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I'd be looking for another svt header....Have a look in the buy/sell section...Also have a look at TurboTom's svt header/flex system.
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Old 11-10-2018, 04:35 PM   #3
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I'm not sure what you mean by looking into Tom's header... Is there a better option than finding a SVT part? Checked his site and searched around here and didn't see anything to clarify.

I had a thought. What if I install an ORP / cat delete and install a new bung for a new O2 sensor further downstream? If there's no cat it doesn't matter where it is .. right?
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Old 11-12-2018, 04:00 PM   #4
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The front one you want where it was originally....the rear one you can delete w/ a tune.
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Old 11-12-2018, 11:52 PM   #5
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You DO need to locate the front O2 close to where it was before, it reads best with lots of heat, which it loses the further back it is situated at.
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Old 11-14-2018, 10:45 AM   #6
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Originally Posted by amc49 View Post
You DO need to locate the front O2 close to where it was before, it reads best with lots of heat, which it loses the further back it is situated at.
Alright, that makes logical sense. Unfortunately. Stayed tuned for details I guess.
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Old 11-14-2018, 08:27 PM   #7
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Old 11-18-2018, 11:11 PM   #8
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So yeah. I got to peak underneath at a muffler shop as they assessed "the issue"... couple of old mechanical veterans trying to figure out what the heck was going on...

Nothing really looks "bent" per se, but whatever the issue, there is certainly no way the O2 sensor socket is fitting on to that sensor. There doesn't seem to be an inexpensive way out of this. New header? $$$ Drop the exhaust, flame it and bend it? $$$.

This is stupid. I just want to have a functional O2 sensor, why on earth was it even placed there to begin with in the crazy cramped corner.

New question: What if I purchase the cat-delete ORP from CFM? Maybe the O2 sensor position would be different enough it would clear. I dunno. Any other helpful hints?
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