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Cayenne Hybrid - P0492 Secondary Air Injection fault

roundm

PCGB Member
Member
Hi

has anyone found anyone able to rectify this error for sensible cost ? I have a 2010 Hybrid and the Audi S4 derived supercharged engine is apparently known for throwing this error code because of airways in the cylinder heads getting blocked with carbon (and other junk). The 'fix' is to either remove the engine completely or to remove the front of the car (including the radiators and zircon radiators) taking a load of pipework off the block and then use a glorified pipe cleaner (or a drill) to clean the carbon from the airways before reassembly. There are a number of video's online showing this process.

apparently Audi have a way to do it in situ using a very high pressure water jet (to cut the carbon) - but my local Audi dealer won't talk to me as it's a Porsche! they separate the cats from the exhaust, remove the spark plugs and then use a flexible hose with a water cutting tool to insert into the airway and clean out the carbon. Do any OPC's have access to this kit?

my local Porsche specialist has suggested between £3.5k and £5k for this work - which is mental on a car with only just over 50k miles

Has anyone found a better solution/specialist who can do this for sensible money ?

TIA

Mark

 
Hi Mark
I have the exact same issue with a 2016 Cayenne S-E Hybrid- what was your outcome with this in the end?
Look forward to hearing from you.
Cheers
Luke
 
Luke

I got it resolved at my local OPC (Porsche Portsmouth), they have developed a solution to this that is about half the Audi cost! and they are willing to do just the bank that has the failure (waiting for the other bank adds nothing to the cost).

Basically I think they drop the exhaust manifold off and then insert a sort of flexible hone from the rear of the engine (i.e using the access that Audi do with the water cutter - but using a different method to remove the carbon) which I think is the way the air is pumped in when it's all working right.

one bank was slightly more expensive than the other - due to a need to remove some of the hybrid stuff for access, but it was something like £900 one side and £1000 the other (probably gone up a bit since we did it).

Car has performed great ever since it was done. If you are local to Hampshire, it might be worth giving Porsche Portsmouth a call - I don't know any other OPC that took this approach, but it worked!

Mark
 
That’s interesting, I have A 2016 e hybrid and that’s just happened to mine too.i just had 6 year major service done & an AC recall if some sorts.


did you manage to figure it out?

thank you
 
I did. See my reply to the previous post.


I believe the petrol engine in your car and mine are the same - so you may be able to solve it the same way
 
I have a Cayenne 2016 se hybrid and that’s just happened to my car! Secondary Airlow fault diagnosed. Need to remove the engine as it's clogged up. Parts £150 - plus any extras for bolts and seals that can't be re-used, plus 10 hours labour @£252 per hour. Plus £250 diagnostic! Plus VAT! £3600 circa - Expensive!! Anyone else had this issue and a cheaper fix?
 

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