I have a 94 850 Turbo that has had a little trouble starting for a little while but now will not start. I fiddling with it a month ago, I discovered that if I disconnected the fuel relay (the one located under the rad shroud) and immediately reconnected it, it would start; however, as of yesterday it just will not start even when I do that. When it won't start, I'm not getting a spark but there seems to be good fuel flow.
ODB codes are: 143 (front knock sensor), 153 (rear O2 sensor), 241 (EGR system, flow malfunction), and 314 (CMP sensor). I've swapped the Camshaft position sensor with a known working one.
The 241 code (EGR system, flow malfunction) appeared for the first time yesterday (the others have been there for some time) so I'm thinking there might be some connection to it.
Any thoughts or ideas would be greatly appreciated.
Thanks,
Ed

Have you cleaned your EGR, and other vacuum hoses including the pcv system? If not your hoses may not be breathing well enough, causing a "choking out" even before your engine gets enough air flow. Just my thought, but I'm sure Klaus or others will chime in. Could be your 02 sensor (and maybe even MAF), but I would try the cheaper stuff before going there.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.

Thanks,
I cleaned some of the hoses before I ran out of sunlight. I'll get a knock sensor and clean the rest when I replace those(would a faulty knock sensor create a no start condition?).

Could, but I would do the other stuff first, reset the codes and see if they come back. So many of the codes are secondary to others.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.