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Discussion Starter #1
I resently changed the spark plugs and coil no 2 because I had codes now those codes are gone and I had a little vibration when I was stopped so I put some injection cleaner in my gas tank then the light came on again and I got the codes 420 and 430 .My question is would the injection fuel cleaner have anything to do with the catalyst converter codes?
 

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more likely you have 200km+ on it
 

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The codes are often caused by the catalytic converter getting lazy with age. Sometimes they can be revived temporarily with a good cooking by running the car at high revs in a low gear for a few miles. Otherwise it's either a new cat or this cheater fix:
You can try replacing the pre and post O2 sensors first but I had to employ the "fix" on a friend's 200,000+ mile Civic that already had two new sensors AND a new cat. It's been working keeping the SES light and codes off for two+ years.
 

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What year is your second generation Rav4?

Member and second generation Rav4 owner "Mach III" built the RC filter described below and said it eliminated his Rav4's P0420/p0430 codes:
See The final solution for the dreaded P0420/P0430 codes?

Last month I built one of these filters for the rear oxygen sensor signal on my first generation Rav4. I used a 1 megohm resistor and 4.7 microfarad capacitor, just like the filter in the video above. Here's my DIY guide for the filter: Rear Oxygen Sensor Modification (for Code p0420) - ellessite
 
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