Sky InsuranceMonster Motorsport
Results 1 to 23 of 23
  1. #1
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520

    Putting CATs back in; sensor?

    Hi guys,

    My previous owner chopped the CATs out of the exhaust and welded in straight pipe. The flanges are still there, and my MOT is coming up, so I'm looking to buy a standard CAT section to pass the MOT (got a few sources lined up). Question is, how do I fit the sensor back? When my CATs were removed, the sensor went with it....and if I buy a new sensor, where do I need to wire it to?

    Cheers guys,
    Aran

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #2
    Dani_B19's Avatar
    Audi-sports own special child.

    Status
    Offline
    Join Date
    Nov 2008
    Location
    Barnsley
    Posts
    7,173
    Sod cats, find a friendly moter haha.
    Driving the most secretive S3 on ASN

  4. #3
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    lol, trust you to say that Dani!! Mr. I've got a 3" custom :P

  5. #4
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,285
    the post cat lambda screws into the cat and then has a connection under a little plastic cover where the 2 wires join up so i would suggest you check if the other part of the wire is still there or not.

    Does your EML light come on on the dash? cos if not it can be coded out so you could effectively fit a cat without the sensor and just put a bung in the hole
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  6. #5
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    err, call me stupid, but where is this "little plastic cover" mounted so that I can get underneath my car and check it's still there?

    Also, without a post-CAT lamda, will my cars fuel trim not be all over the place?

  7. #6
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,285
    Quote Originally Posted by Squirrelofdoom View Post
    err, call me stupid, but where is this "little plastic cover" mounted so that I can get underneath my car and check it's still there?

    Also, without a post-CAT lamda, will my cars fuel trim not be all over the place?
    Not sure if affects fuel or not much it just measures the effeciency of the cat as such. As soon as i put my 200 cell cat on the EML light came on which is what happens if the lambda is working and it detects a cat issue. So if you dont have a sensor currently and you have no EML light its either been coded out. Or maybe they have just hidden the lambda sensor somewhere under the car but still connected electrically.

    The little box that cover the connector is on the drivers side about 10inches in and about 2ft back from the front wheel. It kinda looks like a tupperware box held on with 2 plastic nuts
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  8. #7
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    Cool, i'll have a look tomorrow. I currently run a stock map with no EML light, so maybe they have hidden it somewhere...

  9. #8
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,285
    Quote Originally Posted by Squirrelofdoom View Post
    Cool, i'll have a look tomorrow. I currently run a stock map with no EML light, so maybe they have hidden it somewhere...
    My guess is it hidden somewhere then and just reading lots of clean fresh air coming out of your decat lol hence the no EML light. Yeah if you find said box then it should lead you to your lambda sensor or whatever is connected to your car to make it think it has a working one.
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  10. #9
    beachbuggy's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Jan 2010
    Location
    Surrey
    Posts
    1,727
    Just map the rear O2 sensor out. It'll stil get through mot, it's not really needed.

  11. #10
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    well, if the sensor is there I will plug it in. If not then Dan, are you able to map it out? At some point I need to discuss with you Stage 1 mapping anyway

  12. #11
    Dani_B19's Avatar
    Audi-sports own special child.

    Status
    Offline
    Join Date
    Nov 2008
    Location
    Barnsley
    Posts
    7,173
    What can i say, the ladys love the 3" girth haha. On a side not, my mates amk s3 got decatted at the same time and his eml lights always on and always logs a vcds code.

    what engine codes your car mate?
    Driving the most secretive S3 on ASN

  13. #12
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    sigh...i was waiting for someone to make a 3" joke!! Mine's an APY

  14. #13
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    also, Rob, clear some of your PMs so I can send you one! :P

  15. #14
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,285

    Putting CATs back in; sensor?

    Done now mate
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  16. #15
    Dani_B19's Avatar
    Audi-sports own special child.

    Status
    Offline
    Join Date
    Nov 2008
    Location
    Barnsley
    Posts
    7,173
    Lmao, you set me up for it.

    dude if its a apy it ony has a pre cat lambda haha, bless. So you dont have to worry about the second lambda as you dont have one, same as me .
    Driving the most secretive S3 on ASN

  17. #16
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    say what?! boomtown!! lol Ahhh Dani, what would I do without you?

  18. #17
    Dani_B19's Avatar
    Audi-sports own special child.

    Status
    Offline
    Join Date
    Nov 2008
    Location
    Barnsley
    Posts
    7,173
    I honestly dont mate, i really dont haha.

    So what you sorted out cat wise then?
    Driving the most secretive S3 on ASN

  19. #18
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    hahaha, that enough ego boosting for you now? :P

    Probably gonna take Robs old ones. Car is going down to JKM in a couple weeks anyway and he's based nearby, seems like a good shout. I'll use them for MOTs and then whip them back off and put the straight through back on afterwards

  20. #19
    Dani_B19's Avatar
    Audi-sports own special child.

    Status
    Offline
    Join Date
    Nov 2008
    Location
    Barnsley
    Posts
    7,173
    Ok lol.

    Sounds like a plan mate, should be easy enough todo.
    Driving the most secretive S3 on ASN

  21. #20
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    yerp, quick question while i'm at it. If i'm swapping that section of piping in and out, does that section have those wire mesh crush pieces between them? Or is it just the metal flange up against each other which seals?

  22. #21
    Dani_B19's Avatar
    Audi-sports own special child.

    Status
    Offline
    Join Date
    Nov 2008
    Location
    Barnsley
    Posts
    7,173
    No i beliee they have some kind of flange mate, you could just use some cheap exhaust putty, not like the cats will be in long enough and just sae the seals for the decat!
    Driving the most secretive S3 on ASN

  23. #22
    Squirrelofdoom's Avatar
    3rd Gear

    Status
    Offline
    Join Date
    Feb 2012
    Location
    Surrey
    Posts
    520
    fair point, your wisdom is useful once more :P

  24. #23
    vrbob's Avatar
    Thats no Moon, Thats a space station!

    Status
    Offline
    Join Date
    Jun 2007
    Location
    Southampton
    Posts
    2,285

    Putting CATs back in; sensor?

    The downpipe end has a flange gasket put if its just for mot purposes a spot of putty will do for a short time. The other end that connects to the back box has a sleeve clamp and does not need any sort of gasket.

    As for the post cat sensor that's all good then as I have put a bung in the hole where that would go so that's sorted.
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

 

 

Similar Threads

  1. Milltek Cat Back Install
    By imported_5VTurbo in forum A3/S3 Forum (8L Chassis)
    Replies: 4
    Last Post: 20th August 2004, 22:59
  2. S4 Cat Back Exhaust
    By duane in forum A4/S4 forum(B5 Chassis)
    Replies: 1
    Last Post: 1st June 2004, 16:51
  3. Milltek cat back without middle silencer
    By DuncS3 in forum A3/S3 Forum (8L Chassis)
    Replies: 1
    Last Post: 29th May 2004, 16:23
  4. Supersprint CAT Back Exhaust Groupbuy for S3
    By Grant in forum A3/S3 Forum (8L Chassis)
    Replies: 3
    Last Post: 22nd April 2004, 10:59
  5. Standard S4 Cat back exhaust on Ebay
    By teknobod in forum A4/S4 forum(B5 Chassis)
    Replies: 0
    Last Post: 22nd November 2003, 21:29

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO