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Old 09-20-2017, 04:27 PM
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Join Date: Oct 2013
Posts: 16
1997 S420 - Secondary air. how dead am I?


I get a P0410 code. The pump is working, starts on cold start - blows hard, turns off etc - seems to be mechanically/electrically working right.

I can't quite tell if the vacuum valve which opens to allow the air into the exhaust system is working right. Mostly because i have no idea how to take it off, anyone? The screws/bolts are on the underside and I have no way of reaching them without taking the front of the car/engine apart - so - any suggestions would be great on how to check that valve.

Does anyone know if the air is fed directly into the exhaust - or does it go through the cylinder head? I'm hoping it's a straight dump to exhaust, because then it's much easier to repair - otherwise I have to take the head off - which just might not be worth it on this car.

Thoughts? HELP!

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Old 04-11-2018, 02:00 PM
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Join Date: Feb 2007
Location: los angeles
Posts: 590
Need to check o2 sensor for correct operation needs to see air injected
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