Date: Sun, 11 Mar 2007 23:04:18 -0000 From: "kingdoodlesquat" <neggerscheggersnospamtseacatspam.com> Subject: Re: Oxygen sensor
"Fred W" <malt_houndnospamo.com> wrote in message news:3JidnR4qQbgfFWnYnZ2dnUVZ_tOmnZ2dnospamast.com... > kingdoodlesquat wrote: > > "Fred W" <malt_houndnospamo.com> wrote in message > > news:rcudnVa4druwGWnYnZ2dnUVZ_s2vnZ2dnospamast.com... > > > >>kingdoodlesquat wrote: > >> > >>>Hello all, > >>> > >>>I've recently bought a '98 900S turbo & was having a look at the fuses > > > > by > > > >>>the passenger door (like you do) & have discovered that fuse 38 for the > >>>oxygen sensor has blown it fuse. First off, what does the sensor do & is > > > > it > > > >>>the same thing as the lambda sensor? Second thing, is this likely to > > > > cause > > > >>>any damage if it's not working? > >>> > >>>It runs really wells at the moment & I've not noticed any drop in > >>>performance, so I'm at a loss at what the problem really is. > >>> > >>>tia > >>> > >>>kds > >>> > >>> > >> > >>First off, yes the O2 senosr is the same as a "lambda" sensor. > >>The only part of the sensor that gets power is the heater. The purpose > >>of the heater is to get the sensor up at operating temperature faster so > >>that the ECU can go into closed loop mode faster. This design minimizes > >>the higher emmissions period of "open-loop" warm-up mode. If there is a > >>problem with it you would notice it about 3-5 minutes after a cold start > >>when the ECU tries to switch over to closed loop. > >> > >>Normally, you would then get a check engine fault of some sort. You may > >>want to verify that you Check Engine lamp is OK, and has not been > >>defeated by the prior owner or unscrupulous salesman. > >> > >>-- > >>-Fred W > > > > > > Cheers Fred. Looks like I'll be forking out for a new sensor then - unless I > > can blame it on the crap fuel at Tesco's. > > > > > > I assume that you already tried changuing the fuse and it blew again? > If so, you may want to just check that the short is not elsewhere in the > wiring. If you follow the cable back from the O2 sensor you will come > to a connector. Try unplugging it, then plug in a new fuse and see if > the fuse blows again. If it does the problem is (obviously) not in the > sensor. > > While a shorted heater is not impossible, it's not a common failure mode > for the sensors. That and they are pretty dear at ~$100 a pop. > > -- > -Fred W I'm in the UK & its night-time at the moment, so I cann't get hold of any fuses just yet. Nevertheless, I look forward to frustrating myself tomorrow. Cars - nothing but a black hole in which to pour copious amounts of cash, but at least my black hole is a Saab!!!
