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Date: Sun, 11 Mar 2007 18:53:52 -0400 From: Fred W <malt_houndnospamo.com> Subject: Re: Oxygen sensor
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
