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Posted on Jan 02, 2017
If you have low pressure in the exhaust manifold, then there would an exhuast leak somewhere from the exhaust manifold to the tail pipe. These leaks tend to get bigger over driving time. It may be the exhaust manifold gasket, or a crack in the manifold. Give a good listen for a sputtering sound. Part of the exhaust pipes have to be removed for access to the manifold. A good spray of PB breaker will help a lot with the bolts here.
Escaping gas is bad for the environment. This also causes gas to enter the manifold and make its way to the valves. The temperature of the incoming air is very cold compared to the combustion chamber and can cause damage the your valves by stressing them.
If you find no leak, then you may consider the sensor may be faulty or the leak is very small.
Posted on Mar 04, 2010
A6 2.0 TDI 1997
Got same problem around 35000Km. Engine light on with same error P0471. I was in France, Audi reset error and found nothing suspect. 4 weeks later same problem. (I felt engine was executing filter regeneration cycle very often). After 1 more week, Exhaust symbol came into large display and engine into safe mode (max 90Km/h). Contacted my Audi dealer in Belgium. They immediately told me pressure sensor (measures obstruction over DPF) was defective ; happens more often. Car was just beyond 2 Y old. Replaced under warranty. No more problems.
Posted on Aug 26, 2010
2453 is theor paticulate soot filter and 244 is just the restricted performace differential pressure sensor, needs to b e serviced for sure...
Posted on Sep 11, 2011
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