You would think that the non-fouler O2 mod would be pretty easy, but........

ImolaRocket · 02-23-2006, 08:58 AM

First, I went through a half dozen of the damn things drilling them out. Finally got a set together and installed it. My block 46 time was a whopping .01 sec, and read B1-S2 OK. Great! Then a CEL popped-up. B1-S2 circuit malfunction! Just perfect! I cleared it and went for a drive watching the O2 voltage. Never moved off of .05v. I guess that the ECU thought that meant the O2 was bad. My first thought was that I fubared the sensor somehow. I removed the non-foulers and installed the O2 directly back into the pipe. O2 worked great. Same readings as the other sensor. Anyone else have that problem after the mod?? Also, what type of brazing rod did you use? I bought some nickel alloy, and the old Mapp gas just doesn't want to get hot enough to melt it very well. Maybe a copper alloy will work better? Any suggestions for drilling these damn things out??

Christian (Stage Ow) · 02-23-2006, 09:03 AM

http://forums.audiworld.com/midatlan...s/119216.phtml

ImolaRocket · 02-23-2006, 09:13 AM

ImolaRocket · 02-23-2006, 09:28 AM

dscottjr · 02-23-2006, 09:46 AM

Eric 2.7 · 02-23-2006, 10:22 AM

ImolaRocket · 02-23-2006, 10:42 AM

dscottjr · 02-23-2006, 10:48 AM

Switchblind360 · 02-23-2006, 10:55 AM

I had no problems with this mod when I had stock O2's. I used 1/2" drill bit and then reamed it out a little extra with the drill bit (I said reamed!). Another option is Pre-cat Snooping O2 simulators from Baker electronix. EdyJun's directory has a link to it. I have been running them for a month now with no CEL. Plus warrantied for a year, and you'll never have to mess with your rear O2's again.

ImolaRocket · 02-23-2006, 11:06 AM

02-23-2006, 08:58 AM	#1
ImolaRocket AudiWorld Super User Garage is empty, add now Join Date: Jan 2001 Posts: 2,644	You would think that the non-fouler O2 mod would be pretty easy, but........ First, I went through a half dozen of the damn things drilling them out. Finally got a set together and installed it. My block 46 time was a whopping .01 sec, and read B1-S2 OK. Great! Then a CEL popped-up. B1-S2 circuit malfunction! Just perfect! I cleared it and went for a drive watching the O2 voltage. Never moved off of .05v. I guess that the ECU thought that meant the O2 was bad. My first thought was that I fubared the sensor somehow. I removed the non-foulers and installed the O2 directly back into the pipe. O2 worked great. Same readings as the other sensor. Anyone else have that problem after the mod?? Also, what type of brazing rod did you use? I bought some nickel alloy, and the old Mapp gas just doesn't want to get hot enough to melt it very well. Maybe a copper alloy will work better? Any suggestions for drilling these damn things out?? __________________ 2001.5 Imola/Onyx 6-Speed Stage 3 Minus w/GIAC-X ASP 3" DownPipes RS4 Clutch Vogtland coilovers Flik Artic (18x8.5) Summer AT Italia Riva (17x8) Winter RS4 Grill APR Snub mount APR Bi-Pipe DarIntake Toy_Guy SStuff Neuspeed 19mm rear bar Neuspeed/Borla G2 Exhaust AutoSpeed DTS AWE/IAP A-Pillar Boost Gauge RS4 "Air Leather" Shift Knob

02-23-2006, 09:03 AM	#2
Christian (Stage Ow) AudiWorld Super User Garage is empty, add now Join Date: Jan 2004 Posts: 3,102	I planned on using RMcQ's writeup. What are you brazing? http://forums.audiworld.com/midatlan...s/119216.phtml __________________ __________ "It's easier to practice medicine without a license in this country than it is to get info on tuning Motronic." -JasonS9

02-23-2006, 09:13 AM	#3
ImolaRocket AudiWorld Super User Garage is empty, add now Join Date: Jan 2001 Posts: 2,644	Brazing the two pieces together because the 19/32" leaves the threads soooo thin they break. __________________ 2001.5 Imola/Onyx 6-Speed Stage 3 Minus w/GIAC-X ASP 3" DownPipes RS4 Clutch Vogtland coilovers Flik Artic (18x8.5) Summer AT Italia Riva (17x8) Winter RS4 Grill APR Snub mount APR Bi-Pipe DarIntake Toy_Guy SStuff Neuspeed 19mm rear bar Neuspeed/Borla G2 Exhaust AutoSpeed DTS AWE/IAP A-Pillar Boost Gauge RS4 "Air Leather" Shift Knob

02-23-2006, 09:28 AM	#4
ImolaRocket AudiWorld Super User Garage is empty, add now Join Date: Jan 2001 Posts: 2,644	I went that route once also. 1/2" bit, then a dremel. __________________ 2001.5 Imola/Onyx 6-Speed Stage 3 Minus w/GIAC-X ASP 3" DownPipes RS4 Clutch Vogtland coilovers Flik Artic (18x8.5) Summer AT Italia Riva (17x8) Winter RS4 Grill APR Snub mount APR Bi-Pipe DarIntake Toy_Guy SStuff Neuspeed 19mm rear bar Neuspeed/Borla G2 Exhaust AutoSpeed DTS AWE/IAP A-Pillar Boost Gauge RS4 "Air Leather" Shift Knob

02-23-2006, 09:46 AM	#5
dscottjr AudiWorld Super User Garage is empty, add now Join Date: Sep 2002 Posts: 14,593	I used a MIG welder. __________________ 00 S4, Euro spider hose mod!! 04 allroad, needs rs6 intercoolers, k04s and a cargo box...

02-23-2006, 10:22 AM	#6
Eric 2.7 AudiWorld Super User Garage is empty, add now Join Date: Aug 2003 Posts: 2,808	Show off ; P __________________ Eric 2000 A6 2.7T DIY Mule: Full Timing Belt Replacement, Cam Seals & Cam Tensioner Gaskets, Engine Mounts (TWICE! Thanks Hamburg-Technic/ECS), O2 Sensors, 2ndary Coolant Pump, '03 OEM Sport Suspension, H-Sport Sway Bars, Control Arms, Tie Rod Ends, CV Joint Boots & All Kinds of Maintenance Stuff. Retired: 1996 A4 2.8 2wd 12v 1987 4000CS Quattro 1980 4000 2door (not even an "S")

02-23-2006, 10:42 AM	#7
ImolaRocket AudiWorld Super User Garage is empty, add now Join Date: Jan 2001 Posts: 2,644	Big time showoff !! __________________ 2001.5 Imola/Onyx 6-Speed Stage 3 Minus w/GIAC-X ASP 3" DownPipes RS4 Clutch Vogtland coilovers Flik Artic (18x8.5) Summer AT Italia Riva (17x8) Winter RS4 Grill APR Snub mount APR Bi-Pipe DarIntake Toy_Guy SStuff Neuspeed 19mm rear bar Neuspeed/Borla G2 Exhaust AutoSpeed DTS AWE/IAP A-Pillar Boost Gauge RS4 "Air Leather" Shift Knob

02-23-2006, 10:48 AM	#8
dscottjr AudiWorld Super User Garage is empty, add now Join Date: Sep 2002 Posts: 14,593	lol. __________________ 00 S4, Euro spider hose mod!! 04 allroad, needs rs6 intercoolers, k04s and a cargo box...

02-23-2006, 10:55 AM	#9
Switchblind360 AudiWorld Member Garage is empty, add now Join Date: Feb 2006 Location: Boise, Idaho Posts: 145	Are you using stock rear O2's? I had no problems with this mod when I had stock O2's. I used 1/2" drill bit and then reamed it out a little extra with the drill bit (I said reamed!). Another option is Pre-cat Snooping O2 simulators from Baker electronix. EdyJun's directory has a link to it. I have been running them for a month now with no CEL. Plus warrantied for a year, and you'll never have to mess with your rear O2's again. __________________ Previous: '85 4000, '01 S4 ASP Stage 3, '06 A4 2.0T, 91 200 Stage 2 Current: '00 A6 2.7t EPL Stage 3, Darintake, Carbon Trim, 18" R8 Reps, H&R/KONI Sports, Ceramic pads, D/S Rotors, OEM RS4 Piggified DP's, Full Magnaflow 2.5" Resonated Exhaust, Ceramic coated Intake pipes/mani/exhaust mani/DP's, 2" vast bi-pipes, JHM FMIC

02-23-2006, 11:06 AM	#10
ImolaRocket AudiWorld Super User Garage is empty, add now Join Date: Jan 2001 Posts: 2,644	Zoldman O2's. __________________ 2001.5 Imola/Onyx 6-Speed Stage 3 Minus w/GIAC-X ASP 3" DownPipes RS4 Clutch Vogtland coilovers Flik Artic (18x8.5) Summer AT Italia Riva (17x8) Winter RS4 Grill APR Snub mount APR Bi-Pipe DarIntake Toy_Guy SStuff Neuspeed 19mm rear bar Neuspeed/Borla G2 Exhaust AutoSpeed DTS AWE/IAP A-Pillar Boost Gauge RS4 "Air Leather" Shift Knob

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