There's absolutely no need to throw any money at it.
Did you do as I said in my last post?
Emissions are very simple.
The mixture ratio needs to be 'stoichiometric', which basically means the 'correct ratio of air and fuel' in order for the cat to do its job.
Correct is Lambda 1.0. Your lambda sensor should see to this if everything is as it should be. You can see what the lambda is doing with a scanner that gives live data readings. If you don't have a scanner you can also see it with a multi-meter with the positive wire to the black wire on the lambda and the negative on the grey lambda wire. The voltage should go up and down from below 0.44 v to above 0.44 v. Typically you'll see it go from 0.15 up to 0.85, but all it MUST do in fact is vary above and below 0.44v. If it does this the lambda sensor, and also the mixture ratio is OK.
If it is OK and your car then fails on lambda IT IS THE MEASURING PROCEDURE THAT IS WRONG.
If it fails on CO, or HC but passes on lambda then it would be your catalist at fault.
Post your actual test results. CO%, HC ppm, Lambda and ideally O2% as well and I will be able to see exactly what is happening.
Has your exhaust got a big silly fat tailpipe?
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