I purchased a 2007 Chevy Avalanche and almost immediately the check engine light came on. I ran a code scanner on it and said that P0430: Catalyst System Efficiency Below Threshold (Bank 2). I thought for sure I was replacing a Cat or at least O2 sensor. I read up here to try the Lucas Deep Cleaner first. I had to do emissions on it so I gave it a try. I immediately threw in a bottle and it cleared the codes and 4 days later I was shocked when it passed the emissions with no codes. I used Lucas before and will continue putting a bottle in every 4000 miles.

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