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Old 10-25-2019, 09:48 PM   #1
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Secondary air injection system issue

Hello, my Cayman 987.1 152K miles is giving me a CEL with codes P0491 and P0492, secondary air injection system insufficient flow.

I my AOS failed and was replaced a few weeks ago, and was running great since then, with a smooth idle. The weird thing I got this after the car was already warmed up.


I searched the forums for ways to fix but seen no real clear resolution but replacing eveything in that system one at a time, Also are there two air pumps(one for each side/bank) and how can they both be bad at same time,

I live in CA and cannot just reset the CEL, block off and disregard.

any more insight or experience would be greatly appreciated thanks

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Old 10-26-2019, 07:09 AM   #2
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Someone might have an answer here on this forum, but you might also search on Planet-9.com as it's more 987 centric.
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Old 10-26-2019, 09:25 AM   #3
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Quote:
Originally Posted by Batman10 View Post
Hello, my Cayman 987.1 152K miles is giving me a CEL with codes P0491 and P0492, secondary air injection system insufficient flow.

I my AOS failed and was replaced a few weeks ago, and was running great since then, with a smooth idle. The weird thing I got this after the car was already warmed up.


I searched the forums for ways to fix but seen no real clear resolution but replacing eveything in that system one at a time, Also are there two air pumps(one for each side/bank) and how can they both be bad at same time,

I live in CA and cannot just reset the CEL, block off and disregard.

any more insight or experience would be greatly appreciated thanks
Remove the exhaust manifolds To see if the SAI passages are blocked, clean with brake cleaner spray.
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Old 10-26-2019, 10:07 AM   #4
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No, only one air pump, one electronic valve and one check valve (as far as I can see on the PET).

Verify that the pump is coming on at cold start. If it is, then replace both valves. If it is not, check the pump fuse and relay.
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Old 10-27-2019, 04:12 PM   #5
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secondary air injection system issue

thanks for all the great ideals to try folks, will do

maybe a clue into my issue,

today I noticed going uphill on canyon road the revs would surge a little every five seconds which was weird and new. but was fine crusing on level ground and when stopped...
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Old 10-28-2019, 11:42 AM   #6
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under hard cornering the idle is fine,

I did the oil cap test while running and it there was no extreme suction so I am ruling out the AOS for now... but have heard some sad tales of new AOS installs that went south quickly,

my AOS failure was a bad one that got oil into intake, plugs, and probably cats so im thinking the oil must be in a air line or something

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