A friends '88 Vanagon failed the CA smog check. The readings are as follows. Anyone have any suggestions as to where to start? How about the temp sensor for the ecu? If so, where is this bugger? The cat was recently replaced.

Thanks, Leo

      ASM EMISSION TEST RESULTS           
                  
      CO2% O2%  HC (PPM) HC (PPM) HC (PPM) CO% CO% CO% NO (PPM) NO (PPM NO (PPM) 
      Test RPM Meas Meas Max GP Meas Max GP Meas Max GP Meas Results 
      15 mph 2151 9.33 0.03 121 308 226 0.7 2 8.8 1006 1788 209 Gross Polluter 
      25mph 2061 9.64 0.02 101 258 228 0.90 2.02 8.31 866 1588 158 Gross Polluter