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  #1  
Old January 5th, 2005, 12:02 PM
mspell
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Michael Spellman
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Help w/ O2 sensor...

Question for you smart folks...this summer I got a check engine light, throwing off the code for a bad O2 sensor. It happened right at the end of an 8hr ride, after parking the truck & letting it cool it ran fine. I reset the light by unplugging the ECU, & no problems thus far...sorta. My mileage per tank has gone from 235 to 200, & the idle is a bit more lumpy. Any thoughts on replacing the O2 sensor anyway?
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  #2  
Old January 5th, 2005, 12:10 PM
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Abel Villesca
1995 D-90 ST
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I don't know much about rover engines, but in one of our forced induction rally cars, removing the O2 sensor will cause the ECU to think it needs to add lots more fuel causing a rich condition that will eventually foul plugs, other sensors and damage the cats.
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Old January 6th, 2005, 01:26 AM
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02 Sensors

Mike did the light re-appear? CEL back on so to say? If not then it probably was just the ECU detecting a fault in one of the 02 sensors more so apparent after a long drive.

If I were to possibly address the loss in mpg I would investigate the following components:

Fuel filter - when was it last changed?
Spark plugs
Air Filter
Certainly the 02 sensors play a pertinent role in the fuel system. If the system runs too lean or too rich then there will be a loss or decline in the mpg.

In my experience 02 sensors usually do not last much past 100K miles on rovers. I had one die @ around 60K IIRC. Good Luck.
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  #4  
Old January 6th, 2005, 01:33 AM
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Hans Haase
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When an O2 sensor goes bad, the computer goes into a default mode since it no longer gets the live info regarding if the engine is running rich or lean. Unfortunately, Rovers use a much less common type of sensor called a Titania sensor as opposed to the normal Zirconia sensor.

Just found this website though, best prices I have ever found on a Titania type sensor. This is for a 94/95 truck. A 97 has double the number of sensors and they are a bit pricier per each.
https://www.automedicsupply.com/cata...b169cac693a160

Get the universal, the only difference is the wiring connectors and you can splice it right in and save yourself a bunch of money.

-Hans
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  #5  
Old January 6th, 2005, 08:23 AM
mspell
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Michael Spellman
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Thanks for the responses. The light has not come back on, & the truck does not stumble/sputter like it did when the light came on. It is only a loss in MPG & a perceived rougher idle that has me wondering. I think I'll change it out anyway.
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  #6  
Old January 7th, 2005, 09:20 AM
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Randy Black
'95 D 90 SW
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I had the same problems with my 95 D. It would run ok for a while after resetting the computer, then happen again.

I bought the less expensive sensor that RoversNorth carries (both sides) and have not had anymore problems.
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