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Originally Posted by cudaspaz
The part with the o-rings is called an EHA electro hydraulic actuator, the orings do leak at times.(next to fuel distributor under air cleaner cover).If replaced, lamda needs reset/adjusted.
If it were my car, I would pull the fuel pump package cover off and take a real good look at the rubber fuel hoses and banjo fittings going to and from the fuel pump, sometimes you can't see what's lurking under that cover.
Should be 3, 10mm plastic nuts holding the cover on.
Good luck.
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I actually did this yesterday. I have found all the rubber hoses to be old but no sign of leaks. I am replacing all hoses in the raar as well as a broken hose (completely severed) at the charcoal canister. I think the caniser hose is the problem. Some way the oder maybe getting from under the front left fender to inside the car. No sign of leaks at the EHA. Of course this problem only happens about once every 2 months or so. So it will take about a year to know if I really got it.
J. Roncallo