02-17-2014, 02:21 AM
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#1
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Registered User
Join Date: Aug 2013
Location: Gibraltar
Posts: 91
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Sorry guys, I didn't give a lot of attention till yesterday,
I saw my secondary CATs come with an 02 sensor at the begin of the CAT and then an 02 sensor at the end.
Is this normal for a 2003 year car? I thought these MY03 have one 02 sensor on primary CAT and one on secondary CAT.
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02-17-2014, 04:25 AM
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#2
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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Quote:
Originally Posted by notech
Sorry guys, I didn't give a lot of attention till yesterday,
I saw my secondary CATs come with an 02 sensor at the begin of the CAT and then an 02 sensor at the end.
Is this normal for a 2003 year car? I thought these MY03 have one 02 sensor on primary CAT and one on secondary CAT.
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I learned in another thread that Euro cars have O2 sensors in the rear cats. The Fabspeed pipes I bought have 2 bungs for sensors which I plugged but you will need.
__________________
'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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02-19-2014, 02:02 AM
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#3
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Registered User
Join Date: Aug 2013
Location: Gibraltar
Posts: 91
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Quote:
Originally Posted by Timco
I learned in another thread that Euro cars have O2 sensors in the rear cats. The Fabspeed pipes I bought have 2 bungs for sensors which I plugged but you will need.
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Sorry, do I need to connect both of the sensors per pipe? cheers
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02-19-2014, 04:24 AM
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#4
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,432
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Quote:
Originally Posted by notech
Sorry, do I need to connect both of the sensors per pipe? cheers
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If your car has them then you need them. It needs that feedback. Unplugging one will give CEL.
__________________
'04 Boxster S 50 Jahre 550 Spyder Anniversary Special Edition, 851 of 1953, 6-sp, IMS/RMS, GT Metallic silver, cocoa brown leather SOLD to member Broken Linkage.
'08 VW Touareg T-3 wife's car
'13 F150 Super Crew long bed 4x4 w/ Ego Boost
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02-26-2014, 07:44 AM
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#5
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Registered User
Join Date: Aug 2013
Location: Gibraltar
Posts: 91
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Me again! 
Yesterday I was changing spark plugs and found that manifolds don't have any cats!
My car is MY 03 and manifolds look pretty standard.
I am surprised, shoulnd't I have two cats on them?
Cheers
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02-26-2014, 10:49 AM
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#6
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Registered User
Join Date: Nov 2012
Location: Auckland, New Zealand
Posts: 16
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I have the same set up on my car - euro spec car, apparently EU4 emissions - has 2 cats at the rear just before the muffler box.
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02-26-2014, 11:38 PM
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#7
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Registered User
Join Date: Aug 2013
Location: Gibraltar
Posts: 91
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Ok, that makes sense! so I am running with no cats then (the exhaust doesn't sound so loud as no cats at all, to me, still similar to stock at low rpm, then high ad 4K rpm of course).
I will try to put 2x O2 sensors on cat bypass and 2x O2 sensors out somewhere to pick clean air, that should fool ECU and remove CEL I believe.
Cheers,
Ser
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