Feb 102010
 

2000 Saturn, secondary air system engine code, the pump is working , the fuse is fine, why does it still kick this code, cannot get the car inspected because of this. Had the air pumped checked by dealership and they said it was working, but when you drive to get ready for inspection that code still kicks up what could be the problem

the code is 0410 secondary air system

Response:

The computer turns on the air pump when needed as well as turn it on for testing of the system from time to time. It can be a tricky code in that the scanner may show pump OK and it does come on but..,. may not be coming on when needed or commanded by the computer. Since we know pump is OK, this narrows it down to a couple things that will cause code to still return. the combination check valve as shown below could be bad. You need to remove the vacuum hose from the valve, run engine at idle to see if hose has vacuum on it, is so,, very good possibility you have bad combination valve. the other item would be oxygen sensor problem. the o2 sensors are what tells the computer what the exhaust smells like and if the pump needs to be turned on to clear fuel vapors. I wish I could tell you what it is. I am leaning towards combo valve as usually? the o2 sensor will throw another code or 2 as well. Your problem is intermittent so makes diagnosis very hard.

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