Need some help with DTC: Secondary Air Injection System, Bank 1: air flow too low #17831

Quattro-X · 08-26-2005, 04:38 PM

Yes I STFA, but there is nothing conclusive on this one. Is the air injection speaking about the turbos? Or some pollution controll crap? Thanks in advance.

DaveD4 · 08-26-2005, 05:04 PM

I had a code like this on my A4 2.8 and it referred to part of the smog equipment. The problem was caused by rotting vac hoses leading to the air injection valves. On the 2.8, they are located on the back of the engine, one each side, near the fire wall. Don't know for sure if the 2.7t is the same, but you might want to look around back there for some vac lines.

hope that helps,
Dave

Quattro-X · 08-26-2005, 05:08 PM

Eric 2.7 · 08-26-2005, 06:00 PM

of your brake booster line and it branches out to a silver hatted valve at the back of each cylinder bank.

The silver hatted valves are vacuum operated so if you have a code for only one side, it is likely the vacuum line to that valve or the valve itself.

BTW, extra air is injected since the engine starts up rich to get the cats off to a quick start. It's only on tips, though, but I'm not sure why.

Quattro-X · 08-26-2005, 06:37 PM

Then it suddenly idles fine after about 15 seconds. This is good info. I'll pop the hood in the AM. Are these expensive parts?

***Quattro-X-2*** · 08-27-2005, 06:49 AM

Eric 2.7 · 08-27-2005, 06:09 PM

08-26-2005, 05:04 PM	#2
DaveD4 Junior Member Account #: 3015 Join Date: Mar 2000 Posts: 629	This might be some help I had a code like this on my A4 2.8 and it referred to part of the smog equipment. The problem was caused by rotting vac hoses leading to the air injection valves. On the 2.8, they are located on the back of the engine, one each side, near the fire wall. Don't know for sure if the 2.7t is the same, but you might want to look around back there for some vac lines. hope that helps, Dave __________________ 01.5 S4 stg 3

08-26-2005, 05:08 PM	#3
Quattro-X New Member Account #: 57124 Join Date: Jun 2003 Posts: 127	Good starting point. Thanks. __________________ 1998.5 1.8TQM 2000 S4

08-26-2005, 06:00 PM	#4
Eric 2.7 Member Account #: 61325 Join Date: Aug 2003 Posts: 2,808	Yep, that's emissions control stuff. The blower is right under the foam covered part of your brake booster line and it branches out to a silver hatted valve at the back of each cylinder bank. The silver hatted valves are vacuum operated so if you have a code for only one side, it is likely the vacuum line to that valve or the valve itself. BTW, extra air is injected since the engine starts up rich to get the cats off to a quick start. It's only on tips, though, but I'm not sure why. __________________ 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")

08-26-2005, 06:37 PM	#5
Quattro-X New Member Account #: 57124 Join Date: Jun 2003 Posts: 127	Interesting you say that. My car starts a little rough sometimes. Then it suddenly idles fine after about 15 seconds. This is good info. I'll pop the hood in the AM. Are these expensive parts? __________________ 1998.5 1.8TQM 2000 S4

08-27-2005, 06:49 AM	#6
*Quattro-X-2* Rest In Peace Account #: 22927 Join Date: Jul 2001 Posts: 343	I found a cracked hose. Good call.

08-26-2005, 04:38 PM	#1
Quattro-X New Member Account #: 57124 Join Date: Jun 2003 Posts: 127	Need some help with DTC: Secondary Air Injection System, Bank 1: air flow too low #17831 Yes I STFA, but there is nothing conclusive on this one. Is the air injection speaking about the turbos? Or some pollution controll crap? Thanks in advance. __________________ 1998.5 1.8TQM 2000 S4

08-27-2005, 06:09 PM	#7
Eric 2.7 Member Account #: 61325 Join Date: Aug 2003 Posts: 2,808	Good news! Cheapest possible outcome. __________________ 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")

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