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Volvo 850 Made from 1993 to 1997, this Volvo line was available in both a wagon and a sedan, both with were graced with several trim levels.

Nitric Oxide (NO) is really high, how can I lower it?

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Old 12-02-2009, 06:46 PM
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Default Nitric Oxide (NO) is really high, how can I lower it?
Just went through a smog check, nitric oxide levels are almost near maximum...how can I bring those down?
 
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Old 12-02-2009, 08:32 PM
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A little info on the car please.
Last tune up?
How old are the O2 sensors?
 
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Old 12-03-2009, 02:59 AM
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sorry, it's a 96 with 166k miles, last tune up was at 150K miles

i just bought the car last week, so no idea how old O2 sensors are. from the looks of the records, seems like it might be original
 
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Old 12-03-2009, 08:41 AM
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I would change out the O2 sensors then. 166K on the original O2 sensor is a long time.

Also, how is your gas mileage?
 
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Old 12-03-2009, 12:30 PM
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gas mileage was around 22 for combined city and highway. don't know what highway alone is like
 
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Old 12-03-2009, 06:26 PM
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Does your car have EGR? If it does, clean the EGR valve and ports in the intake... The main purpose of the EGR system is lowering NOx emissions. If it doesn't have an EGR system... the cat could be getting weak. But yeah, DEFINITELY change the O2 sensors... they're supposed to be changed about every 100,000 miles.
 
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