So my ‘03 boxster at 70k threw codes P0491 and 92 , found out what they are etc. as it’s both banks I’m going to do vacuum hoses and the valve. Relay must be fine as the pump and fan come on fine, so is fuse. My question is which pages is it in the manual , I’m being stupid and can’t see where it is, index tells me 24-24 I think it was which tells me the issue but not the pictures with step by step guide? Was about to sell it and as driving out with buyer the light came on, so want to get this done. Hasn’t been an issue before and hasn’t come back since clearing it 3 days ago. Last question is it a fairly simple but very fiddly thing I can do from the top of the engine, don’t have a lift handy and have a real phobia going under theses when on jacks/ramps or stands . Did google YouTube but didn’t see anything that covered it really. Just the pages numbers is my real need please?
Bentley manual pages - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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YOUR RESEARCHBentley manual pages - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Found it on here finally - http://986forum.com/forums/boxster-general-discussions/53903-need-help-vacuum-lines.html
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
FWIW, mine's been displaying 2ndary air code for a couple years now. Turn it off with Durametric and it doesn't reappear for months. Pump runs. This obviously has zero effect on how the car starts or runs, but it does pollute a bit and if code is present will fail emissions testing. Will take to pro when needed as prefer the idea of someone that's done it before.
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