Hi,

I just purchased a 1993 300e 2.8 with 132k miles. It has failed emissions twice. The following are the numbers I am getting.

Emissions Results
Standard HC CO% CO2% RPM
Standard 100 0.50 -- 2500
Test 1 169 0.43 14.4 1702 failed HC
Test 2 136 0.55 14.2 2452 failed HC and CO%

Before Test1, Dealer serviced the car at 120K, changed plugs, etc.
After Test1, I changed the O2 sensor.

Could these show a problem with catalytic converter? Would adding a fuel injection cleaner liker Techron help?

Thanks,
BW