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Old October 19th, 2004, 08:44 AM
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Troy Smith
1995 D90 SW
Join Date: Oct 2003
Location: Roanoke, VA, USA
Posts: 252
Fault Code 45?

My 95 D90 sw is giving me a Fault Code 45. My manuals tell me 45 and 46 are the O2 sensors. Is 45 the drivers side or passenger side? One manual tells me it is the right side but is that looking at the truck or sitting in the truck? Maybe my brain is just not working today!



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Old October 19th, 2004, 09:47 AM
Mike Hippert's Avatar
Mike Hippert
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94 D-90 Grinding Rover
Join Date: Sep 2003
Location: Manchester NH USA
Posts: 4,790
If you have not then I would say reset and wait for it to happen again, if it does then I would try unplugging the passenger side O2 sensor, if you get another fault then I would say it is the driver side that is bad, but this is just a guess.

Don't forget to Search first then ask questions later! The loose nut behind the wheel
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Old October 20th, 2004, 12:04 AM
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Robert Dassler
1994 D90
D-90 Source Vendor
Join Date: Apr 2004
Location: Albuquerque, NM, USA
Posts: 987
Yes, codes 44 and 45 are O2 sensor codes. I think code 45 is drivers side, but I wouldn't swear to it. Keep in mind that 14CUX is a very basic fuel management system that needs some interpretation. A code 45 means that the ECU could not adjust the fueling to it's liking on that bank. It does not necessarily mean a bad O2 sensor, there could be an ignition misfire, air leak, exhaust leak, etc. that can trip the fault. I would look closely at the ignition system for any sign of misfiring as well as tightening the connector pins in the O2 sensor plugs...they are known to get loose and cause intermittent connections.
Cheers, Rob
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