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I found this:
I have an 2004 S40 T5 with the same problem, reading codes: 208C:-fuel pressure sensor interruption/signal too high, 209B:- fuel pressure sensor signal improbable.
I replaced the fuel rail pressure sensor, and it is a very easy fix.
The fuel rail pressure is on the top left corner of the engine below a plastic cover, just to the right of the cam belt, and below the oil cap. It is secured by one (yes only 1) torx screw. #WARNING# Ensure you hold a rag over the sensor whilst removing it as the rail will probably be pressurised, I'm sure there's a bleed valve somewhere but I'm not sure where
I got the sensor for £68 ($107USD) by quoting the Bosch part no (written on the side of the sensor) to my local autofactor who ordered direct from Bosch.
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The above came from:
http://volvoforums.com/forum/volvo-s40-11/2005-volvo-s40-t5-fwd-engine-losing-power-acceleration-33773/page2/
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Your P0190 equates to the 209B.
Klaus
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There is no present time, just the past and future
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