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All smog values have deteriorated 1999 Toyota Camry CE manual 205K miles

I have just barely passed the smog check( almost failed on HC) and I have noticed that all the parameters have deteriorated considerably since the last smog check two years ago. What could this be a sign of? HC(PPM) ====== 2011 15mph - meas 55(max 55) 25mph - meas 19(max 39) 2009: 15mph - meas 17(max 55) 25mph - meas 7(max 39) CO(%) ==== 2011 15mph - meas 0.22(max 0.50) 25mph - meas 0.12(max 0.48) 2009: 15mph - meas 0.01(max 0.50) 25mph - meas 0.00(max 0.48) NO(PPM) ====== 2011 15mph - meas 37(max 437) 25mph - meas 34(max 724) 2009: 15mph - meas 24(max 437) 25mph - meas 20(max 724)
Answer:

Your Toyota's oxygen sensor might be getting a bit "lazy". It seems there's a slight increase in CO emissions as well, indicating a rich mixture. Typically it's the oxygen sensor which is responsible for changes in air/fuel ratio. We'd recommend conducting a propane enrichment test to verify the oxygen sensor's response time and voltage output, and move on from there. If your Toyota is a V6, both oxygen sensors will need to be diagnosed (Bank 1 and Bank 2). posted by SmogTips Support

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