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A question for the experts. :notworthy:

I have a 2001 996 TT with 28K miles; runs just fine. A few weeks ago, a CEL appeared. I purchased an OBD scanner and got two codes- 0410 and 1411.

I examined the air injection/ emission system as diagramed in a previous search and nothing looked out of place. I pulled and tugged at a couple of hoses but really didn't do much beyond that.

I reset/ cleared the CEL thinking I would punt to the Dealer and have them take a look at it. <_<

In the mean time, the CEL has not reappeared.

Question: is it possible that whatever tripped the CEL in the first place was a spontaneous one time event that has since been corrected?

If the malfunction was still present, would not the CEL reappear?

If the CEL has not reappeared and the car runs fine, should I bother taking it in? I did run the scanner again after clearing the codes and nothing reappeared.

Any and all thoughts greatly appreciated. :)

Sameer

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P0410 Secondary Air Injection System, Bank 1 - Below Limit - Signal Implausible (Cylinders 1 - 3)

P1411 Secondary Air Injection System, Bank 2 - Below Limit - Signal Implausible (Cylinders 4 - 6)

Sounds like your air pump was not working. Could be a loose connection.

post-2-1123856989_thumb.jpg

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P0410 Secondary Air Injection System, Bank 1 - Below Limit - Signal Implausible (Cylinders 1 - 3)

P1411 Secondary Air Injection System, Bank 2 - Below Limit - Signal Implausible (Cylinders 4 - 6)

Sounds like your air pump was not working. Could be a loose connection.

post-2-1123856989_thumb.jpg

The CEL came on again today and gave the same codes as above. How easy is it to access the air pump, fittings and valves in a 996? Do I need to remove any other equipment or body parts before I tackle this problem? :help:

Thanks

Sameer

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Turbo or normal 996?

2001 996 Turbo. I've done a search and understand the vacuum lines need to be tested and all, but just not quite sure how to access all the parts....

Thanks

Anybody have a DIY or pics or suggestions on how to access the components? (2001 996 TT) :drive:

Thanks

Sameer

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A common fault is the diverter valves fail. They share a vacuum source with the secondary air system and if one of the two diverter valves fails, it will cause a CEL for secondary air. You can test them by seeing if they hold vacuum (where hoses labeled 34 and 35 connect) with a vacuum pump/gauge. Its possible to test without removing anything from the engine.

The valves aren't numbered in the PET picture provided above but its the two vacuum operated valves right next to each other towards the top left.

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A common fault is the diverter valves fail.  They share a vacuum source with the secondary air system and if one of the two diverter valves fails, it will cause a CEL for secondary air.  You can test them by seeing if they hold vacuum (where hoses labeled 34 and 35 connect) with a vacuum pump/gauge.  Its possible to test without removing anything from the engine.

The valves aren't numbered in the PET picture provided above but its the two vacuum operated valves right next to each other towards the top left.

Thanks for your advice. I hope this does not display my ignorance, but is all the hardware and components accessible through the engine hood or does the bumpber, wheel and wheel liner need to come off? :huh:

Thanks

Sameer

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