Have PO 420 & 430 catalysit codes my Boss 302 LS has 3k miles so do not believe it is the cats? Did add some unleaded dracing gas to my fuel as I had some from another car, it is the only thing that is not stock? Anyone else have this issue and solution. Thanks much everyone.
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PO 420 & 430
- Thread startermcgregor32000
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Mad Hatter
Gotta go Faster
It could be the race gas you added was full of that stuff that makes those ugly orange deposits in the engine, but that takes a while to build up.. I would suspect its more likely a problem with your O2 sensors. If the car has been without use and sitting for ages, good bet that the sensors are at fault.
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Yes thought that might be the issue but lt gets a few miles a month to a show now and then. It has been trailered to shows before I got it 2nd owner. Any other thoughts help is appreciated.
Thanks much
Thanks much
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