Please, can anyone help? I have an A6 2.5 tdi 1998 that is lacking power. It will only rev up to 2500 revs, I've replaced the MAF sensor which improved the performance a little but the diagnostic's is displaying 00575 manifold absolute pressure sensor - G71. I didn't think this car had a MAP sensor, I thought they just used the MAF? I have had a look around the engine and can't find anything that looks like a MAP sensor. Ive also checked the EGR valve and the turbo actuator valve which all seems to be operating correctly. If anyone could shed some light on this fault I would really appreciate it.