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Volvo 1997 S90 failed smog inspection two times.

My Volvo S90 failed the smog test 2 times. So far we have replaced the oxygen sensor and EGR valve, smog pump has also been replaced, catalytic converter has been checked and replaced, with no problems. Car is still showing high emissions. Can you please tell me what it could be to lower the emissions, and pass smog check?
Answer:

The next step (first step in most instances) is to have a certified smog check repair station diagnosis your Volvo's smog check failure. You should give them the failed smog check report. They will run their own tests as well. They will charge a diagnostic fee to figure out what the problem is. This is normal. We recommend asking the station owner/manager/technciain if he or she will guarantee the repairs to your Volvo. In other words, if they say your S90 needs a CAT, and you let them replace it, will they guarantee your car will pass the smog check? We recommend asking these questions and if the answers make sense then allow them to diagnose your Volvo's smog check failure. Sometimes it is not possible to be able to promise a passing car. At times the faults causing a vehicle to fail the smog check are to many, and by replacing a few components there can be made no guarantee to pass. We also recommend using our SmogSmart VIR Report system. We'll be able to give you a much better idea of what your vehicle's emission problem might be. The SmogSmart VIR Report system will ask you to fill in all the information our report system & technicians need to effectively evaluate your vehicle's emissions failure. You may also use the "Additional Information" section of the blank form to include detailed comments. To obtain your vehicle's SmogSmart Report, please visit the On-Line Evaluations Page at VIR Report - Online Smog Check Diagnosis posted by SmogTips Support

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