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Emissions 850

posted by  rjcarne on  Thu Jul 26 09:43 CST 2012
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last visit: Thu Jul 26 17:10 CST 2012
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my 1993 volvo 850 GLT VIN YV1LS5507P2094366 failed State emission test. NOx (ppm) standard 848/RPM 2293 reading 1127 FAIL....at low speed RPM 472 standard 937 Reading 1730 FAIL. I was told to check and clean the EGR valve but my vintage does not have an EGR Valve (that is why I included the VIN). The DTC codes show 121 MAF signal and 223 IAC valve opening signal. I have no idea what these are or if they are accountable for the NOx failure. I have checked the vacuum hoses and replaced any bad ones, changed the spark plugs, used injector cleaner, changed the oil and filters, installed a new oxygen sensor. None of the above seemed to change anything. I can scan and include the "vehicle inspection reports if you need it






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posted by  rjcarne  on Thu Jul 26 09:43 CST 2012 >


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