09-20-2013, 04:50 AM
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#1
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,433
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Can anyone help translate what these codes are trying to say?
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'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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09-20-2013, 08:00 AM
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#2
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Registered User
Join Date: Nov 2012
Location: Southern, CA
Posts: 460
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The Boxster engine includes an emissions device to inject fresh air in to the exhaust (if I remember correctly). There are quite a few threads on it, the codes, and the potential fixes.
Best suggestion I can offer is to clear the codes and see if they return. If they do, then it is time to search for the potential cause. There are many, from failed compressors, failed pressure hoses, etc.
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1999 Boxster Zenith Blue Metallic/Savanna Beige
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09-20-2013, 09:13 AM
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#3
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soucorp
Join Date: Apr 2013
Posts: 181
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P0491 Secondary Air Injection System, Bank 1 - Insufficient Flow
P0492 Secondary Air Injection System, Bank 2 - Insufficient Flow
Possible cause of fault
- Electrical fault in power supply or line between relay and secondary air injection pump
- Secondary air injection pump relay mechanically faulty
- Mechanical fault in electrical secondary air valve
- Pneumatic secondary air valve faulty/sluggish
- Electrical fault in secondary air injection pump
- Mechanical fault in secondary air injection pump or secondary air injection pump blocked
- Vacuum system leaking
- Air hose to secondary air injection pump slipped off or constricted
What others have said about resolving this issue:
= This code is a PIA to troubleshoot.... (turned out my cats were bad).
= Went back to my dealer. It was a cracked vacuum tubing -diagnosed and replaced free of charge in 30 mins.
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09-29-2013, 07:08 PM
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#4
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,433
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So I found a very comprehensive diagnosis guide online, then today it gave me these same codes again. Time to dig in.
Does the fact that it's both banks and that I am getting an incomplete test result on Catalytic Monitoring, Evaporative system, and Secondary Air system tell me anything? Are these systems related?
Tim
__________________
'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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09-30-2013, 12:05 PM
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#5
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Those codes mean that the ECU is detecting a fault in the secondary air injection system. The SAI is used primarily at start up to reduce emissions when the engine typically runs fairly rich and the cat's may not be up to full operating temp. Use of the SAI leans out the exhaust gas for better emissions.
The basic idea is the ECU commands the secondary air pump to inject extra air into the exhaust gas and then monitors the pre-cat O2 sensors for the voltage to change (to the lean side). If there is no change as the extra air is being injected, then something is wrong with the system and the CEL is illuminated.
The possible failure list is long and their interaction can be somewhat complicated (because its a feedback loop it can be hard to determine where to start - kind of a chicken and egg problem - is the O2 sensor broke and sending out a constant voltage or is the air pump broke and not injecting any air resulting in a constant voltage at the O2 sensor! Or are both the O2 sensors and the air pump working fine but there is a leak or other problem somewhere in the plumbing? Ahhhh!!). This is why Soucorp's list of components to check is so extensive.
Hope this somewhat simplified explanation helps.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Last edited by thstone; 02-27-2014 at 07:54 PM.
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09-30-2013, 03:50 PM
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#6
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Porsche "Purist"
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,123
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After making sure the pump runs, check for vacuum and pressure leaks in the many hoses next.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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02-27-2014, 03:12 PM
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#7
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Beginner
Join Date: Mar 2013
Location: Houston
Posts: 1,659
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Timco,
Did you fix this? My Box just threw both codes. Woo Hoo! More stuff to learn!
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2003 S manual
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02-27-2014, 04:05 PM
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#8
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,433
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Quote:
Originally Posted by Jamesp
Timco,
Did you fix this? My Box just threw both codes. Woo Hoo! More stuff to learn!
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Yes. It was the check valve that plugs into the intake manifold (I call it Barry) that had broken and the sec air was just pumping into the engine compartment and not into Barry. New generic check valve for $3.
__________________
'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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02-28-2014, 09:22 AM
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#9
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Registered User
Join Date: Jan 2014
Location: Albuquerque, NM, USA
Posts: 730
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Quote:
Originally Posted by thstone
The SAI is used primarily at start up to reduce emissions when the engine typically runs fairly rich and the cat's may not be up to full operating temp. Use of the SAI leans out the exhaust gas for better emissions.
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Your wording makes it sound like the extra air "dilutes" the exhaust gas mixture, but in fact the extra oxygen causes the unburned fuel to actually burn. It's not "leaning out," that is.
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Kent Christensen
Albuquerque
2001 Boxster
2007 GL320 CDI, 2010 CL550
2 BMW motorcycles
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02-28-2014, 10:59 AM
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#10
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Registered User
Join Date: Feb 2013
Location: Land of naught
Posts: 1,302
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Quote:
Originally Posted by Jamesp
Timco,
Did you fix this? My Box just threw both codes. Woo Hoo! More stuff to learn!
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Is this what 'life long learning' is?
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Death is certain, life is not.
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02-28-2014, 02:49 PM
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#11
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Beginner
Join Date: Mar 2013
Location: Houston
Posts: 1,659
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Timco,
Can you give me Barry's precise address so I can hunt that mother down for a bit of one on one? :troll:
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2003 S manual
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02-28-2014, 04:10 PM
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#12
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I am my own mechanic....
Join Date: Feb 2013
Location: Salt Lake City, UT
Posts: 3,433
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Quote:
Originally Posted by Jamesp
Timco,
Can you give me Barry's precise address so I can hunt that mother down for a bit of one on one? :troll:
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Barry Manifold is right on top. The SAI tube plugs into a black & white check valve then into Barry.
__________________
'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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02-28-2014, 08:28 PM
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#13
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Beginner
Join Date: Mar 2013
Location: Houston
Posts: 1,659
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Quote:
Originally Posted by Timco
Barry Manifold is right on top. The SAI tube plugs into a black & white check valve then into Barry.
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Thanks Timco. I wus confusulated and didn't connect Barely Manenough. The B&W check valve seems to check, so I'm still in learning mode.
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2003 S manual
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10-30-2019, 11:01 AM
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#14
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Registered User
Join Date: Oct 2019
Location: Nashville
Posts: 1
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please explain fault code PO1119 on 2000 boxter
Last edited by 914nut; 10-30-2019 at 11:04 AM.
Reason: spelling
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10-30-2019, 11:24 AM
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#15
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Registered User
Join Date: Aug 2005
Location: Sanford NC
Posts: 2,537
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P1119 Heating of oxygen sensor ahead of TWC, bank 2 (left side looking from the rear, sensor nearest the engine) Could be bad sensor or bad connection or wiring.
More at https://sites.google.com/site/mikefocke2/oxygensensors
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