o2 sensor locations?

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Jun 10, 2014 | 10:41 AM

idprints

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From: Hamburg N.Y.

o2 sensor locations?

Where are the o2 sensors located on my 94 c4?
Thanks

Jun 10, 2014 | 11:06 AM

RollaMo-LT4

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From: Rolla Missouri

2021 C4 of the Year - Unmodified Finalist

St. Jude Donor '10 thru '25

On the exhaust pipes, just in front of the Catalytic converter on each side.

Jun 10, 2014 | 01:55 PM

STL94LT1

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From: O'Fallon Missouri

There is also one post cat o2 sensor on the right side.

Jun 11, 2014 | 02:48 PM

JoeUser

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From: Carrollton TX

And, they're loads of fun to replace.

Jun 11, 2014 | 06:39 PM

John A. Marker

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From: Dublin CA

On the passenger's side there is one before the cat where the bend is on the top side of the pipe and one behind the cat on top of the pipe. There is a single sensor on the driver's side before the cat at the bend on the top side of the pipe.

Jun 18, 2014 | 02:12 PM

JoeUser

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From: Carrollton TX

Quote:

Originally Posted by John A. Marker

Is this true for the '96, as well?

I replaced the upstream one on the passenger side, and am starting on the downstream one behind the cat (having to let some PB Blaster soak in for a day or so, first). I haven't jacked it up on the driver's side yet to determine whether there are two sensors.

Jun 18, 2014 | 02:36 PM

WVZR-1

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Quote:

Originally Posted by JoeUser

'96 is OBD2 so you will have a total of 4 - 2 in each bank, 1 pre cat and 1 post cat each side. Left side post cat is about 8" beyond the coupling, mid- pipe to convertor.

Last edited by WVZR-1; Jun 18, 2014 at 02:40 PM.

Jun 18, 2014 | 04:05 PM

JoeUser

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From: Carrollton TX

Quote:

Originally Posted by WVZR-1

'96 is OBD2 so you will have a total of 4 - 2 in each bank, 1 pre cat and 1 post cat each side. Left side post cat is about 8" beyond the coupling, mid- pipe to convertor.

Ah, that explains why I thought I only saw one on the driver's side; the post-cat one was further back than I looked (and likely hidden by the cross brace on my vert).

Thanks!