Could also be worn rings, basically anything that allows excessive cumbustion gases to leak into the crankcase. There is only so much pressure the PCV system can handle before it's overpowered. One question though, when you did the PCV, did you clear the holes in the block for the breather box? If t...

If they replaced the thermostat they may have put in a 195 where you may have previous had a 185 or 190 degree. These cars came with a few different temp T-stats for turbo, non-turbo etc. but this would not make the car run rough in any way if it was fine before. The running rough would concern me t...

Unmetered air is a strong possibility and Anything related to the A/F metering is possible, but I also noticed you said that the rear O2 was also replaced not to long ago. If they are not of the same type/manufacturer this code can also set. The ECM compares the front and rear O2 adaption values and...

The one in the first image is the EVAP line from the fuel tank to the canister, one line should run under the battary tray and into the car for the cruise. The other two are for the EGR regulator soleniod. If I remember correctly the Yellow line should connect to the regulator solenoid port closest ...

It is possible the oil pressure switch is the source of the leak and the oil light is a symtom of the failing oil pressure switch. A leaking pressure switch will make a hell of a mess even if the leak isn't large due to it's position at the front of the block. http://i204.photobucket.com/albums/bb15...

Agreed, start with vacuum leaks as this is a vary common failure on these cars and a lean A/F ratio will drive combustion chamber temps way up and NOx will increase. One thing I need you to clear up for us is the comments about the car running way to hot. Is it overheating or running any hotter then...

It PASSED! Finally. A combination of two things, first, my original Volvo cat was definitely shot which was replaced by a muffler specialist with a inadequate aftermarket cat the size of a large coffee. That was replaced with a very used Volvo cat which fixed my NOX readings immediately. Next, my V...

Ideally I need to see a pre-cat test result to really tell where you might want to look next. A high HC, and CO reading could be both lean misfire or rich induced and the tell tale factor's will be the Oxygen and Carbon Dioxide levels in the exhaust BEFORE the cat has a chance to convert these gases...

Eurosport Tuning and B&M both used to sell short shifters and they were expensive, but niether show them on thier sites anymore. You could try contacting them, but as few 5 speed 850's as there are out there they most likely don't carry them at all anymore. Maybe you could measure the diameter o...

Not sure about the light, but the pedal issue sounds very much like unwanted ABS engagement, though warped rotors cause similar symptoms but without the pump motor sounds.