So I have the code P0401 logged in my ecu, which is EGR insufficient flow detected, on my A6 with a CDYA engine. The code is down as intermittent which is why I think the EML hasn't come on yet.
My question is, where do I start with this? I have read about engine cleaning (terra/hydro cleans) along with things like seafoam. Also checking a few of the ports as these can block, most common it seems are the ports just behind the throttle body on the intake.
Any help would be appreciated, trying to sort this before it throws a light or does permanent damage.
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My question is, where do I start with this? I have read about engine cleaning (terra/hydro cleans) along with things like seafoam. Also checking a few of the ports as these can block, most common it seems are the ports just behind the throttle body on the intake.
Any help would be appreciated, trying to sort this before it throws a light or does permanent damage.
Sent from my Pixel 6 Pro using Tapatalk