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95.5-2004 Tacomas & 96-2002 4Runners 4th gen pickups and 3rd gen 4Runners

How many O2 sensors on my 98 Tacoma?

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Old Jun 21, 2009 | 05:31 AM
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bain
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From: lenoir, NC
How many O2 sensors on my 98 Tacoma?
On my 98 5 spd 3.4 I only have one sensor after my cat. Should I have one before also? If so is it on the manifold or the exhaust pipe? Thanks
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Old Jun 21, 2009 | 05:32 AM
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From: the great Maine wilderness
not sure about the 3.4, but there should be at least one before the cat.
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Old Jun 21, 2009 | 05:33 AM
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From: Gulf Breeze, FL
It will be on the exhaust pipe, just a little ways before the cat.
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Old Jun 21, 2009 | 05:55 AM
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From: used to be so. cal. now Indy
if you have 1 cat, then you have non-california spec. exhaust, 2 O2 sensors.

if you have 2 cats, you have california spec. exhause, 1 A/F senor, 1 O2 sensor.
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Old Jun 21, 2009 | 11:21 AM
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From: lenoir, NC
Thanks for the help..now where can a man find one of those weld on flanges at so I can put me on one? I found a nonconncted wire on top of the trans so I guess thats the hook up for it.
Last edited by bain; Jun 21, 2009 at 11:28 AM.
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Old Jun 21, 2009 | 01:25 PM
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From: Orlando, FL
Originally Posted by TC4RNR
if you have 1 cat, then you have non-california spec. exhaust, 2 O2 sensors.

if you have 2 cats, you have california spec. exhause, 1 A/F senor, 1 O2 sensor.
Bingo.

Check out Underdog Racing Development.

Fink
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Old Jun 21, 2009 | 04:11 PM
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From: lenoir, NC
Problem solved!!!! Thanks for the help
Last edited by bain; Jun 28, 2009 at 04:43 PM.
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